CN114263291B - Anti-buckling support system with elastic pin connecting end part being reinforced and adjustable in length and installation method - Google Patents

Anti-buckling support system with elastic pin connecting end part being reinforced and adjustable in length and installation method Download PDF

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CN114263291B
CN114263291B CN202210111603.3A CN202210111603A CN114263291B CN 114263291 B CN114263291 B CN 114263291B CN 202210111603 A CN202210111603 A CN 202210111603A CN 114263291 B CN114263291 B CN 114263291B
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steel plate
plate
pin
supporting
elastic cylindrical
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CN114263291A (en
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丁玉坤
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Harbin Institute of Technology
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Harbin Institute of Technology
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract

An anti-buckling support system with an elastic pin connecting end part and an adjustable reinforcing length and an installation method relate to a support system and an installation method. The invention aims to solve the problems that the existing method is not beneficial to overhaul and replace the built-in support; the rigid connection of the supporting end part causes the unfavorable stress of the support; the gap between the pin shaft and the hole wall is difficult to control accurately; the axial dimension error caused by manufacturing error and the like has no adjustable measure; the support ends are susceptible to local bending failure. The restraining component is arranged on the upper end face and the lower end face of the supporting steel plate in the length direction, the perforated lining plate is arranged between the built-in supporting steel plate and the restraining component, the pin joint component is sleeved at the two end parts of the built-in supporting steel plate in the length direction, the pin joint component is connected with the perforated node plate through the elastic cylindrical pin, the supporting steel plate freely deforms relative to the restraining component in the axial direction of the supporting steel plate, and the assembled buckling restrained brace system is connected with the steel frame; the buckling restrained brace system is assembled firstly and then installed on the steel frame. The invention is used for civil construction.

Description

Anti-buckling support system with elastic pin connecting end part being reinforced and adjustable in length and installation method
Technical Field
The invention relates to a buckling restrained brace system and an installation method thereof, in particular to a buckling restrained brace system with an elastic pin connecting end part and an adjustable reinforcing length and an installation method thereof, and belongs to the technical field of building structures.
Background
At present, a common buckling restrained brace integrally manufactured by filling a steel pipe with constraint components such as concrete or mortar is not beneficial to overhauling and replacing a built-in brace, and when the built-in steel plate brace is subjected to low-cycle fatigue fracture, other parts are difficult to recycle;
the end part of a common anti-buckling support is usually connected with a steel frame through a welding seam group or a bolt group, the support end part is in rigid connection substantially, the assumption is inconsistent with the end part hinging assumption adopted in support design and analysis, and after the support frame structure moves horizontally, the support bears the axial force and bending moment, and is unfavorable for the support stress;
after the end part of the anti-buckling support is connected with the frame, because the bending resistance of the exposed section of the steel plate support at the end part of the support is insufficient, after the structure is moved to a large horizontal side, the damage caused by local bending of the end part of the support often occurs, thereby deteriorating the energy consumption capability and ductility of the support;
when the common solid cylindrical pin is adopted to realize the hinged connection of the end parts of the steel support, the gap between the pin shaft and the hole wall is difficult to control accurately due to the manufacturing errors of the hole of the connecting plate and the diameter of the pin shaft, the large gap often causes the slippage of the support under stress to influence the lateral resistance and the energy consumption capacity of the support, and the large gap causes the stress characteristic of the support to be difficult to predict accurately;
the integrally manufactured anti-buckling support has high requirements on the accuracy of the connection and the manufacture of the support and the end part in order to ensure that the support has fixed axial length and is smoothly installed after being manufactured. In particular, there may be the possibility that the support is difficult to mount in the frame due to the lack of adjustability in the axial dimensional tolerances resulting from tolerances in the manufacture of the support and the end connection parts, etc. Even if the support is installed forcibly when the error is not large, large initial stress is generated after the support is installed, and the support stress is unfavorable.
In summary, the prior buckling restrained brace structure has the following technical problems: (1) the maintenance and the replacement of the built-in support are not facilitated; (2) the rigid connection of the supporting end part causes the unfavorable stress of the support; (3) the gap between the pin shaft and the hole wall is difficult to control accurately; (4) the axial dimension error caused by manufacturing error and the like has no adjustable measure; (5) the support ends are susceptible to local bending failure.
Disclosure of Invention
The invention aims to solve the technical problems that the traditional buckling-restrained brace structure has the following technical problems: (1) the maintenance and the replacement of the built-in support are not facilitated; (2) the rigid connection of the supporting end part causes the unfavorable stress of the support; (3) the gap between the pin shaft and the hole wall is difficult to control accurately; (4) the axial dimension error caused by manufacturing error and the like has no adjustable measure; (5) the support ends are susceptible to local bending failure. Further provides an elastic pin connection end part reinforced length-adjustable buckling-restrained brace system and an installation method.
The technical scheme of the invention is as follows: a buckling restrained brace system with an elastic pin connecting end part and an adjustable reinforcing length comprises a built-in supporting steel plate, two restraining components, a perforated lining plate, two pin joint parts, an elastic cylindrical pin and a perforated gusset plate,
the two restraining components are respectively a front restraining component and a back restraining component, the front restraining component and the back restraining component are arranged on the upper end face and the lower end face of the built-in supporting steel plate in the length direction, the perforated lining plate is arranged in a gap between the built-in supporting steel plate and the restraining components, the two pin joint parts are respectively sleeved on one end part of the built-in supporting steel plate in the length direction, the pin joint parts are hinged with the node plates with holes through elastic cylindrical pins, the supporting steel plate is adjustable relative to the restraining components in the axial direction of the supporting steel plate, and the assembled buckling-restrained brace system is connected with the steel frame;
the built-in supporting steel plate comprises a steel plate supporting body, a plurality of steel plate supporting end stiffening ribs, two square connecting plates, upper high-strength bolts and lower high-strength bolts, wherein the steel plate supporting body is in a long strip shape, the left end part and the right end part of the steel plate supporting body are respectively and vertically provided with the two steel plate supporting end stiffening ribs, the two end parts of the steel plate supporting body are respectively provided with one square connecting plate, and the upper high-strength bolts and the lower high-strength bolts are respectively fixedly arranged on the outer end surfaces of the two square connecting plates through girth welding;
the restraining component comprises a rectangular steel pipe and a restraining steel plate, the restraining steel plate is fixedly mounted on the rectangular steel pipe, two end parts of the rectangular steel pipe and the restraining steel plate are respectively provided with a long-strip-shaped groove, the long-strip-shaped grooves are communicated with an inner cavity of the rectangular steel pipe, the long-strip-shaped grooves are used for inserting steel plate supporting end stiffening ribs, the width of the restraining steel plate is larger than that of the rectangular steel pipe, and the restraining steel plate is provided with a plurality of bolt holes at equal intervals along the length direction of the restraining steel plate;
the perforated lining plates comprise a first perforated lining plate and a second perforated lining plate, the two constraint components are radially installed in the vertical direction by taking a built-in supporting steel plate as a reference, the first perforated lining plate and the second perforated lining plate are stacked up and down, the first perforated lining plate and the second perforated lining plate are installed in a gap between the constraint steel plates of the two constraint components, and the constraint components and the perforated lining plates are screwed and connected through friction type high-strength bolts;
the pin joint part comprises a central hole-opening end plate, two hole-opening ear plates, a box body and two hole-opening flitch plates, wherein the box body is a rectangular box body with two open ends;
the elastic cylindrical pin is at least one layer of elastic cylindrical pin.
Preferably, the upper high-strength bolt and the lower high-strength bolt are fixedly mounted on the outer end faces of the two square connecting plates respectively in a welding mode of performing girth welding around the whole periphery of the bolt head.
Further, the thickness of the second apertured liner is less than or equal to the thickness of the first apertured liner.
Preferably, a gap is left between the elongated groove and the stiffening rib inserted into the steel plate supporting end part.
Preferably, when the elastic cylindrical pins are two layers, the two elastic cylindrical pins are sleeved, and the openings of the two elastic cylindrical pins are staggered by at least 30 degrees.
Preferably, when the elastic cylindrical pins are larger than two layers, the elastic cylindrical pins are sleeved from outside to inside in sequence, and the openings of two adjacent elastic cylindrical pins are staggered by at least 30 degrees around the center of the pin hole.
Preferably, when the elastic cylindrical pin is three-layer, the elastic cylindrical pin comprises an inner layer heavy type rolling elastic cylindrical pin, a middle layer heavy type straight groove elastic cylindrical pin and an outer layer heavy type straight groove elastic cylindrical pin, and the inner layer heavy type rolling elastic cylindrical pin, the middle layer heavy type straight groove elastic cylindrical pin and the outer layer heavy type straight groove elastic cylindrical pin are sequentially sleeved from outside to inside;
wherein, the interval between the opening direction of the middle layer heavy straight groove elastic cylindrical pin and the outer layer heavy straight groove elastic cylindrical pin is at least 30 degrees, and the interval between the inner layer heavy rolled elastic cylindrical pin and the middle layer heavy straight groove elastic cylindrical pin is at least 30 degrees.
The invention also provides an installation method for the elastic pin connection end part reinforced length-adjustable buckling-restrained brace system, which comprises the following steps:
the method comprises the following steps: assembling the anti-buckling supporting system with the end part reinforced and the length adjustable through the elastic pin;
the method comprises the following steps: pretreatment before assembly;
derusting the surface of a steel plate supporting body of a built-in supporting steel plate, and then coating high-temperature-resistant and ageing-resistant lubricating grease on the surface of the steel plate supporting body, so that the friction force between the steel plate supporting body and a restraining member as well as between the steel plate supporting body and a perforated lining plate is reduced, and the steel plate supporting is prevented from being rusted;
the first step is: preliminarily assembling the buckling restrained brace;
firstly, placing a restraining member on the back on a horizontal plane, wherein a restraining steel plate faces upwards;
then the built-in supporting steel plate and the perforated lining plates on the two sides of the steel plate support are sequentially placed on the restraining component on the back face in a coplanar manner;
after the primary correct positioning, the front constraint component is continuously stacked on the front surface, at the moment, the front constraint steel plate faces downwards and is correctly positioned, the constraint components on the front surface and the back surface and the hole centers of the corresponding bolt holes of the perforated lining plate are ensured to be collinear, and the constraint components are flush with the outer edge of the perforated lining plate;
after the components to be restrained, the perforated lining plate, the built-in supporting steel plate and the gaps among the components are checked and adjusted to be in place correctly, the high-strength bolt is installed and screwed, so that the primary assembly of the buckling restrained brace is completed;
step one, three: mounting a pin joint component;
s1: first, installing the lower pin joint component:
sleeving a box body in a pin joint component at the lower end on the lower end of the restraint component, and preliminarily connecting a central perforated end plate of the pin joint component at the lower end with a lower high-strength bolt of a built-in support steel plate through a fixing nut;
s2: reinstalling the upper pin joint component:
before the pin joint component at the upper end is installed, an adjustable nut is screwed to a required position according to the axial length of the support to be controlled, then a box body in the pin joint component at the upper end is sleeved at the upper end of the restraint component, and then the central hole-opened end plate of the pin joint component at the upper end is preliminarily connected with the upper high-strength bolt of the built-in support steel plate through the adjustable nut and a fixing nut;
step one is: final assembly of the assembled buckling restrained brace system with the whole end part reinforced length adjustable;
adjusting the gap between the inner side surface of the wall plate of the box body and the outer side surface of the restraining component, and after checking and adjusting the position of the inner side surface and the outer side surface of the restraining component, screwing and fixing the fastening nuts at the two ends on the upper high-strength bolt and the lower high-strength bolt, so that the final assembly of the assembled buckling-restrained brace system with the whole end part reinforced length adjustable is completed;
step two: mounting the buckling restrained brace and the steel frame;
the installation method is as follows:
before the buckling-restrained brace is installed, the perforated gusset plates and the steel frame are welded together, and the distance between the hole centers of the perforated gusset plates at the two ends of each built-in supporting steel plate is equal to the distance between the hole centers of the perforated flitch plates at the two ends of the built-in supporting steel plate; accurately adjusting the position of an adjustable nut according to the actually measured length of the distance, completing the assembly of the assembled buckling-restrained brace with the end part reinforced length adjustable according to the steps, and inserting an elastic cylindrical pin to install the buckling-restrained brace into the steel frame after the assembly of the brace is completed;
or adopting a second mounting mode parallel to the first mounting mode:
the buckling-restrained brace is connected with the perforated gusset plates at two ends through the elastic cylindrical pins, then the whole built-in supporting steel plate provided with the perforated gusset plates is hung in the steel frame, the coaxial line of the built-in supporting steel plate and the perforated gusset plates at two ends is ensured, and then the perforated gusset plates are connected with the steel frame through the welding seams.
Furthermore, in the second step, during the initial assembly of the buckling restrained brace,
a clearance of 1-2mm is reserved between the elongated groove of the restraint member and the inserted steel plate supporting end stiffening rib of the built-in supporting steel plate along each side of the thickness direction of the steel plate supporting end stiffening rib.
Furthermore, in the second installation mode of the step two,
when the perforated gusset plate and the perforated flitch are connected by adopting a plurality of layers of elastic cylindrical pins at each end of the built-in supporting steel plate, aligning the hole center of the perforated flitch at each end with the hole center of the perforated gusset plate, and then sequentially loading an outer layer heavy straight-groove elastic cylindrical pin, a middle layer heavy straight-groove elastic cylindrical pin and an inner layer heavy rolled elastic cylindrical pin;
when the maximum supporting axial force is not less than 0.4 times of the shearing-resistant bearing capacity of the outer-layer heavy straight-groove elastic cylindrical pin and the diameter of the pin hole is not less than 40mm, each end of the support can be connected by adopting three concentric layers of elastic cylindrical pins;
when the maximum supporting axial force is less than 0.4 time of the shearing-resistant bearing capacity of the outer-layer heavy straight-groove elastic cylindrical pin and the diameter of the pin hole is less than 40mm, the number of layers of the elastic pin can be reduced;
in other cases, the connection can be realized by using three layers of concentric elastic cylindrical pins.
When concentric multi-layer elastic pins are adopted, the notches of the two adjacent layers of elastic pins are staggered by at least 30 degrees around the center of the common pin hole, so that the hinged connection of the supporting end part and the steel frame is realized.
Compared with the prior art, the invention has the following effects:
1. the invention adopts an assembly type structure, so that the welding operation of the support component parts is completed in a factory, the manufacturing, assembling and installing quality is easy to ensure, the good anti-seismic performance of the buckling restrained brace is favorably exerted as much as possible, the built-in brace is convenient to overhaul and replace, and other parts which are kept intact can still be repeatedly utilized even if the built-in steel plate brace is broken due to low-cycle fatigue;
2. the invention adopts the elastic cylindrical pin connection to realize the boundary condition of the hinge joint of the two ends of the buckling-restrained brace, which is consistent with the end part hinge joint condition adopted in the design and analysis of the brace, and the brace is not influenced by end bending moment, thus improving the stress performance of the brace;
3. after the pin joint component D which is a reinforcing component with the pin hole is arranged at the end part of the anti-buckling support, the bending resistance of the exposed section of the steel plate support at the end part of the support can be greatly improved, and the local bending damage of the end part of the support after large horizontal side movement is avoided, so that the energy consumption capability and ductility of the support are improved, and meanwhile, the pin hole is convenient for realizing hinged connection;
4. according to the invention, when the elastic cylindrical pin is adopted to replace a common solid cylindrical pin to realize the hinged connection of the end parts of the steel support, even if errors exist in the hole opening manufacture of the connecting plate, because the original diameter of the elastic pin is slightly larger than the diameter of the pin hole, after the elastic pin is extruded into the pin hole, no gap exists between the pin shaft and the hole wall, the support can be effectively prevented from sliding under stress, so that the side resistance and the energy consumption capability of the support are ensured, and the stress characteristic of the support can be accurately predicted. Particularly, when the pin shaft is formed by combining a plurality of layers of straight grooves and the coiled elastic cylindrical pins, the bearing capacity and the deformation capacity of the pin shaft can be flexibly controlled;
5. after the assembled buckling restrained brace provided with the adjustable nut is adopted, the axial length of the brace along the brace can be properly and flexibly adjusted according to the distance between the pin holes at the two ends, so that the precision requirement on connection and manufacture of the brace and the end part is greatly reduced, the brace is convenient to accurately place and install in a frame, initial stress generated after the brace is installed can be avoided as much as possible, and the stress performance of the brace is improved.
6. The whole support system connected by the elastic pin is tightly connected, compact in structure, direct and reliable in force transmission and efficient in manufacturing and installation, particularly the requirements of the lower support and the end connection safety bearing under the earthquake action can be flexibly met by using the multi-layer pin shaft in a combined mode, the energy consumption capability and the ductility of the structure provided with the buckling-restrained brace under the earthquake action can be fully exerted, the elastic pin can be conveniently detached for overhauling or replacing the support after the earthquake, and the economical efficiency is good. Meanwhile, when a large earthquake occurs, because the elastic pin has good elastic deformation capacity, the elastic deformation along the radial direction of the elastic pin can provide extra axial deformation capacity for the support system; and along the axial direction and the annular direction of the elastic pin, the friction energy consumption is generated by the squeezing action between the pin and the pin hole and between the pin layers and the generated relative reciprocating deformation, so that the energy consumption can be supplemented for the structure, and the ductility of the whole supporting system is expected to be further improved and the anti-seismic performance of the structure is expected to be improved.
Drawings
FIG. 1 is a schematic structural view of an anti-buckling support system installed in a steel frame; fig. 2 is a top view taken along line 11-11 of fig. 1. FIG. 3 is a front view of the built-in support steel plate A; FIG. 4 is a top view of FIG. 3; FIG. 5 is a cross-sectional view of FIG. 4 at A11-A11; FIG. 6 is a cross-sectional view of FIG. 3 at A12-A13; FIG. 7 is a bottom view of the binding member B; FIG. 8 is a cross-sectional view of FIG. 7 at B11-B11; FIG. 9 is a cross-sectional view of FIG. 7 at B12-B12; FIG. 10 is a front view of the first apertured liner C-1; FIG. 11 is a side view of FIG. 10; FIG. 12 is a front view of the second apertured liner C-2; FIG. 13 is a side view of FIG. 12; FIG. 14 is a front view of the pin joint component D; FIG. 15 is a cross-sectional view of FIG. 14 at D11-D11; FIG. 16 is a cross-sectional view of FIG. 15 at D12-D12; FIG. 17 is a cross-sectional view at D13-D13 in FIG. 15; FIG. 18 is a cross-sectional view of FIG. 15 at D14-D14; FIG. 19 is a cross-sectional view of FIG. 15 at D15-D15; fig. 20 is a front view of the elastic cylindrical pin E; FIG. 21 is a cross-sectional view of FIG. 20 at E11-E11; FIG. 22 is a side view of an inner layer heavy-rolled elastic cylindrical pin E-1; FIG. 23 is a front view of FIG. 22; FIG. 24 is a side view of a middle heavy straight grooved resilient cylindrical pin E-2; FIG. 25 is a front view of a perforated gusset plate F; FIG. 26 is a cross-sectional view of FIG. 25 at F11-F11; FIG. 27 is a front view of the buckling restrained brace system not installed in the resilient cylindrical pin E; FIG. 28 is a top view of FIG. 27; FIG. 29 is a front view of the buckling restrained brace system installed into a resilient cylindrical pin E; FIG. 30 is a top view of FIG. 29; FIG. 31 is a front view of the buckling restrained brace system shown without the resilient cylindrical pins E and apertured gusset plate F installed therein; FIG. 32 is a top view of FIG. 31; FIG. 33 is a cross-sectional view of FIG. 31 at 22-22; FIG. 34 is a cross-sectional view of FIG. 31 at 33-33; FIG. 35 is a cross-sectional view of FIG. 31 at 44-44; FIG. 36 is a cross-sectional view of FIG. 31 at 55-55; FIG. 37 is a cross-sectional view at 66-66 in FIG. 31; fig. 38 is a cross-sectional view at 77-77 of fig. 31.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 26, and the buckling restrained brace system with an elastic pin connecting end part reinforced length adjustable of the embodiment comprises a built-in supporting steel plate A, two restraining components B, an opening lining plate C, two pin joint parts D, an elastic cylindrical pin E and a node plate F with holes,
the two restraining components B are respectively a front restraining component and a back restraining component, the front restraining component and the back restraining component are arranged on the upper end face and the lower end face of the built-in supporting steel plate A in the length direction, the perforated lining plate C is arranged in a gap between the built-in supporting steel plate A and the restraining components B, the two pin joint parts D are respectively sleeved on one end part of the built-in supporting steel plate A in the length direction, the pin joint parts D are hinged with the perforated node plate F through elastic cylindrical pins E, the length of the supporting steel plate A relative to the restraining components B in the axial direction of the supporting steel plate A is adjustable, and the assembled buckling restrained brace system is connected with a steel frame G;
the built-in supporting steel plate A comprises a steel plate supporting body A-1, a plurality of steel plate supporting end stiffening ribs A-2, two square connecting plates A-3, an upper high-strength bolt A-4 and a lower high-strength bolt A-5, wherein the steel plate supporting body A-1 is in a long strip plate shape, the left end part and the right end part of the steel plate supporting body A-1 are respectively and vertically provided with the two steel plate supporting end stiffening ribs A-2, the two end parts of the steel plate supporting body A-1 are respectively provided with one square connecting plate A-3, and the upper high-strength bolt A-4 and the lower high-strength bolt A-5 are respectively and fixedly arranged on the outer end faces of the two square connecting plates A-3 through girth welding seam welding;
the restraining component B comprises a rectangular steel pipe B-1 and a restraining steel plate B-2, the restraining steel plate B-2 is fixedly installed on the rectangular steel pipe B-1, the two end parts of the rectangular steel pipe B-1 and the restraining steel plate B-2 are respectively provided with a strip-shaped groove B-3, the strip-shaped grooves B-3 are communicated with the inner cavity of the rectangular steel pipe B-1, the strip-shaped grooves B-3 are used for being inserted with a steel plate supporting end stiffening rib A-2, the width of the restraining steel plate B-2 is larger than that of the rectangular steel pipe B-1, and the restraining steel plate B-2 is provided with a plurality of bolt holes B-4 at equal intervals along the length direction of the restraining steel plate B-2;
the perforated liner plate C comprises a first perforated liner plate C-1 and a second perforated liner plate C-2, two constraint components B are radially arranged in the vertical direction by taking a built-in supporting steel plate A as a reference, the first perforated liner plate C-1 and the second perforated liner plate C-2 are overlapped up and down, the first perforated liner plate C-1 and the second perforated liner plate C-2 are arranged in a gap between the constraint steel plates B-2 of the two constraint components B, and the constraint components B and the perforated liner plates C are screwed and connected through friction type high-strength bolts;
the pin joint component D comprises a central hole-opening end plate D-1, two hole-opening ear plates D-2, a box body D-3 and two hole-opening flitch plates D-4, the box body D-3 is a rectangular box body with openings at two ends, the central hole-opening end plate D-1 is fixedly arranged at one opening side of the box body D-3 in a welding mode, the two hole-opening ear plates D-2 are oppositely arranged, one end of each hole-opening ear plate D-2 is vertically and fixedly arranged at the outer side of the central hole-opening end plate D-1, one hole-opening flitch plate D-4 is arranged at the inner side of each hole-opening ear plate D-2, and the two hole-opening ear plates D-2 and the two hole-opening flitch plates D-4 are coaxial;
the elastic cylindrical pin E is at least one layer of elastic cylindrical pin.
In the appearance of the elastic pin connection end part reinforced length-adjustable assembled buckling restrained brace system, the whole elastic pin connection end part reinforced length-adjustable assembled buckling restrained brace system is formed by connecting two perforated gusset plates through an elastic cylindrical pin by a variable cross-section support rod piece which is basically rectangular along the axial direction of the rod piece.
The two restraining members B of the present embodiment are a front restraining member and a rear restraining member, and the front and rear restraining members and the perforated liner plate C are connected by high-strength bolts to enclose the single support steel plate a inside. The front or back binding members are welded.
The steel plate supporting body A-1, the plurality of steel plate supporting end stiffening ribs A-2, the two square connecting plates A-3, the upper high-strength bolts A-4 and the lower high-strength bolts A-5 are formed by welding. The reinforced pin-jointed part (finger-jointed part D) at the upper end or the lower end of the whole supporting steel plate A is composed of a perforated flitch plate, a perforated lug plate, a central perforated end plate and a box section which are welded together.
The box-shaped section in the lower end strengthening pinned joint component is sleeved on the lower end constraint component, and the central hole-opening end plate of the lower end strengthening pinned joint component is preliminarily connected with the lower end high-strength bolt of the steel plate support through a fixing nut. Before the upper end reinforcing pinned joint component is installed, an adjustable bolt is screwed to a required position according to the axial length of the support to be controlled, then the box section in the upper end reinforcing pinned joint component is sleeved on the upper end restraining component, and then the central hole-opening end plate of the upper end reinforcing pinned joint component is preliminarily connected with the upper end high-strength bolt of the steel plate support through the adjustable nut and the fixing nut. In practical engineering application, in order to further improve the tightness of bolt connection, high-strength locknuts with self-locking functions are also suggested to be adopted in all the fastening nuts and the adjustable nuts.
In the perforated liner plate C, the second perforated liner plate C-2 is a perforated thin liner plate and is connected with the constraint component through the perforations by high-strength bolts. The upper end of the notch of the lower slotted part of the constraint component is contacted with the upper end of the steel plate supporting lower stiffening rib, thereby realizing that the self weight of the constraint component is supported by the steel plate supporting lower stiffening rib.
The perforated flitch plate in the upper end or lower end reinforcing pin joint component is connected with the open hole of the perforated gusset plate through an elastic cylindrical pin.
Under the action of horizontal earthquake or wind, when adjacent upper and lower floors are shifted relatively horizontally, perforated gusset plates F at two ends are shifted relatively, and then the whole supporting steel plate A is driven by elastic cylindrical pins at two ends, so that the length of the reinforcing part of the elastic pin connecting end can be adjusted, the assembled buckling-restrained brace is horizontally reset, when the whole supporting steel plate A is shifted horizontally, the built-in supporting steel plate A is compressed and shortened or stretched in tension along the axial direction, and the compression or stretching deformation is correspondingly changed along with the interlayer lateral shift. When the supporting steel plate A is compressed and shortened, because a gap (namely a reserved gap in figure 1) is reserved between the lower end of the steel plate supporting end stiffening rib A-2 at the upper part of the supporting steel plate A and the lower ends of the notches of the end slotted perforated steel plate (referring to the restraining steel plate B-2) and the end slotted rectangular steel pipe (referring to the rectangular steel pipe B-1), the reserved gap is determined according to the expected maximum interlayer horizontal side shift amount, usually the maximum interlayer horizontal side shift amount can be 1/50 with the layer height, and then the reserved gap amount required by the supporting axial direction can be calculated by considering the supporting inclination angle (the inclination angle of the supporting axis relative to the horizontal plane). The supporting steel plate a is freely deformable in the supporting axial direction with respect to the constraining member B. And because the upper end and the lower end reinforcing pin-joint component and the restraint member are laid on the steel plate support, and a clearance is reserved between the support steel plate A and the restraint member, a clearance of 1-2mm is also reserved between the upper end and the lower end reinforcing pin-joint component and the restraint member in the vertical support axial direction, and when the support horizontally moves to the side, the built-in support steel plate A drives the restraint member B and the upper end and the lower end reinforcing pin-joint component to translate and rotate. The built-in supporting steel plate a is used to bear all horizontal forces. The restraining member B and the upper and lower end reinforcing pinned components provide lateral restraint to the built-in supporting steel plate a in the form of a flexural member. When the upper end and the lower end reinforcing pinned joint component and the constraint component B can provide enough lateral constraint for the built-in supporting steel plate A, the supporting steel plate A can be ensured not to be integrally unstable under compression. Under the action of horizontal reciprocation, the built-in supporting steel plate A can be subjected to yielding and continue bearing under the action of pulling and pressing.
The steel frame with the support is arranged, and after the steel frame moves horizontally, the axial force of the steel plate support body A-1 is transmitted to the steel frame by the following way: the axial force of the built-in supporting steel plate A is transmitted to a square connecting plate A-3 welded with the built-in supporting steel plate A through an end steel plate supporting body A-1 and a plurality of steel plate supporting end stiffening ribs A-2, the axial force of the square connecting plate A-3 is transmitted to an end high-strength bolt through a circumferential weld, the axial force of the end high-strength bolt is transmitted to a central opening end plate D-1 through a fastening nut, the axial force of the central opening end plate D-1 is transmitted to a perforated lug plate D-2 through a weld, the axial force of the perforated lug plate D-2 is transmitted to a perforated attachment plate D-4 through the circumferential weld, the axial force of the perforated attachment plate D-4 is transmitted to a perforated node plate F which is simultaneously in contact extrusion with the elastic cylindrical pin through the contact extrusion with the elastic cylindrical pin, and the supporting axial force is transmitted to a steel frame G through the weld.
The second embodiment is as follows: the present embodiment will be described with reference to fig. 3 to 6, and the upper high-strength bolt a-4 and the lower high-strength bolt a-5 of the present embodiment are fixedly attached to the outer end surfaces of the two square tie plates a-3 by welding, respectively, by welding, which performs girth welding around the entire periphery of the bolt head. So set up, the connected mode is simple, reliable, and the transmission of the power of being convenient for. Other components and connections are the same as in the first embodiment.
The third concrete implementation mode: referring to fig. 10 to 13, the thickness of the second perforated liner C-2 is smaller than or equal to the thickness of the first perforated liner C-1. In addition, when the second holed liner C-2 is used alone to leave the gap in the plate thickness direction, the thickness of the first holed liner C-1 is equal to the thickness of the steel plate support. Thus configured, the second apertured liner C-2 is a thin liner for adjusting the gap between the restraining member B, except for the first liner. Other compositions and connections are the same as in the first or second embodiments.
The sum of the thicknesses of the first holed liner C-1 and the second holed liner C-2 in the present embodiment is equal to the sum of the steel plate support thickness and the gap in the plate thickness direction.
The fourth concrete implementation mode is as follows: the present embodiment will be described with reference to fig. 1, in which a gap is formed between the elongated groove B-3 and the inserted steel plate support end stiffener a-2. By the arrangement, the constraint component B reliably provides lateral constraint for the built-in support steel plate A, and the built-in support steel plate A drives the constraint component B and the upper end and lower end reinforcing pin joint part to translate and rotate when the support horizontal side moves. Other compositions and connection relationships are the same as in the first, second or third embodiment.
The fifth concrete implementation mode: referring to fig. 21, the present embodiment will be described, in which two elastic cylindrical pins E are fitted to each other and the openings of the two elastic cylindrical pins E are shifted by at least 30 ° in the case where the elastic cylindrical pins E are two-layered. So set up, be applicable to and support the condition that the atress is big and pinhole diameter is not more than 40 mm. Other compositions and connection relationships are the same as those in the first, second, third or fourth embodiment.
The sixth specific implementation mode: in the present embodiment, when the elastic cylindrical pins E are larger than two layers, the elastic cylindrical pins E are sequentially sleeved from outside to inside, and the openings of two adjacent elastic cylindrical pins E are staggered by at least 30 ° around the center of the pin hole in the present embodiment, which is described with reference to fig. 20 to 24. So set up, be applicable to and support the condition that the atress is great and pinhole diameter is not less than 40 mm. Other compositions and connection relationships are the same as in the first, second, third, fourth or fifth embodiment.
The seventh embodiment: the present embodiment is described with reference to fig. 20 to 24, when the elastic cylindrical pin E of the present embodiment has three layers, the elastic cylindrical pin E of the present embodiment includes an inner layer heavy type rolled elastic cylindrical pin E-1, a middle layer heavy type straight groove elastic cylindrical pin E-2 and an outer layer heavy type straight groove elastic cylindrical pin E-3, and the inner layer heavy type rolled elastic cylindrical pin E-1, the middle layer heavy type straight groove elastic cylindrical pin E-2 and the outer layer heavy type straight groove elastic cylindrical pin E-3 are sequentially sleeved from outside to inside;
wherein, the interval between the opening directions of the middle layer heavy straight groove elastic cylindrical pin E-2 and the outer layer heavy straight groove elastic cylindrical pin E-3 is at least 30 degrees, and the interval between the inner layer heavy rolled elastic cylindrical pin E-1 and the middle layer heavy straight groove elastic cylindrical pin E-2 is at least 30 degrees. So set up, be applicable to and support the condition that the atress is great and pinhole diameter is about 40 mm. Other compositions and connection relationships are the same as in the first, second, third, fourth, fifth or sixth embodiment.
In the built-in steel plate support A, two ends of the steel plate support A are respectively provided with a steel plate stiffening rib, the steel plate support end stiffening rib A-2 is welded with the steel plate support body A-1 and then welded with the square connecting plate, the upper end and the lower end of the square connecting plate are respectively provided with a high-strength bolt, and the square connecting plate is connected with the upper end or the lower end of the high-strength bolt through a circumferential weld. The restraining component on each side of the front surface or the back surface is formed by welding an end part slotted perforated steel plate and an end part slotted rectangular steel pipe, the inner wall surface of the end part slotted rectangular steel pipe is slotted at the position corresponding to the supporting end part stiffening rib, and the end part slotted perforated steel plate is also slotted at the position corresponding to the supporting end part stiffening rib. At the lower end of the support, the upper ends of the lower notches of the end part slotted perforated steel plate and the end part slotted rectangular steel pipe are contacted with the upper ends of the lower stiffening ribs of the steel plate support; at the support upper end, the lower extreme of the upper portion notch of tip fluting trompil steel sheet and tip fluting rectangle steel pipe all leaves one section space with the lower extreme of steel sheet support upper portion stiffening rib along supporting the axial, avoids steel sheet support axial pressurized to shorten the back extrusion restraint component. The perforated lining plate, the perforated thin lining plate and the steel plate support are arranged in a coplanar manner. The thickness of the perforated lining plate is the same as that of the steel plate support. The upper end or lower end strengthening pinned joint component is composed of a perforated flitch plate, a perforated lug plate, a central perforated end plate and a box-shaped section through welding. The box section is made of four equal thickness steel plates welded together or of hot rolled box section steel. When the whole assembled buckling restrained brace is assembled, the lower end is connected with the central hole-opening end plate of the lower end strengthening pin-connected component and the lower end high-strength bolt of the steel plate support through the fixing nut, and then the upper end is connected with the central hole-opening end plate of the upper end strengthening pin-connected component and the upper end high-strength bolt of the steel plate support through the adjustable nut and the fixing nut. When the upper end is assembled, the adjustable bolt is firstly screwed to a required position according to the axial length of the support required to be controlled, and then the upper end reinforcing pinned joint component is installed and is screwed and fixed by the fastening nut. In the manufacturing and assembling process, the steel plate support, the upper end and the lower end of the steel plate support are strengthened and can be connected with a pin component, and the upper end and the lower end of the steel plate support are high-strength bolts which are strictly coaxial.
Each end of the steel frame and the supporting steel plate A is connected through an elastic cylindrical pin by adopting a node plate with holes. When the maximum supporting axial force is not less than 0.4 times of the shearing resistance bearing capacity of the outer layer heavy straight-groove elastic cylindrical pin E-3 and the diameter of the pin hole is not less than 40mm, each end of the support can be connected by adopting three concentric layers of elastic cylindrical pins, and the outer layer and the middle layer adopt heavy straight-groove elastic cylindrical pins; the inner layer adopts a heavy-duty rolled elastic cylindrical pin. When the maximum supporting axial force is less than 0.4 time of the shearing resistance bearing capacity of the outer layer heavy straight-groove elastic cylindrical pin E-3 and the diameter of the pin hole is less than 40mm, the number of layers of the elastic pin can be properly reduced. In other cases, the connection can be realized by using three layers of concentric elastic cylindrical pins. When concentric multi-layer elastic pins are adopted, the notches (or the starting positions) of the two adjacent layers of elastic pins are staggered by at least 30 degrees around the center of the common pin hole (for example, the notches are staggered by 180 degrees between the first layer and the second layer, and the notches are staggered by 90 degrees between the second layer and the third layer). The shape and size of the gusset may vary depending on the inclination of the support shaft with respect to the horizontal. In order to facilitate installation and take stress into consideration reasonably, the thickness of the perforated node plate is 1-2mm smaller than the clear distance between the two perforated veneers at each end of the support. The hole diameters of the perforated flitch plate and the perforated node plate in the upper end or lower end reinforced pin joint component are strictly the same, and the hole diameters of the upper end or lower end reinforced pin joint component and the perforated flitch plate are both 0.5-0.9mm smaller than the outer diameter of the outer layer elastic pin.
The specific implementation mode is eight: the present embodiment is described with reference to fig. 1 to 38, and the method for installing the buckling-restrained brace system with the end portion reinforced by the elastic pin of the present embodiment includes the following steps:
the method comprises the following steps: assembling the anti-buckling supporting system with the end part reinforced and the length adjustable through the elastic pin;
the method comprises the following steps: pretreatment before assembly;
derusting the surface of a steel plate support body A-1 of a built-in support steel plate A, and then coating high-temperature-resistant and aging-resistant lubricating grease on the surface of the steel plate support body A-1 to reduce the friction force between the plate support body A-1 and a constraint component B and a perforated lining plate C and prevent the steel plate support from being rusted;
the first step is: preliminarily assembling the buckling restrained brace;
firstly, the restraining component B on the back side is placed on a horizontal plane, and the restraining steel plate B-2 faces upwards;
then the built-in supporting steel plate A and the perforated lining plates C on the two sides of the steel plate support are sequentially placed on the restraining component B on the back face in a coplanar manner;
after the primary correct positioning, the front constraint component B is continuously stacked on the front constraint component B, at the moment, the front constraint steel plate B-2 faces downwards and is correctly positioned, the constraint component B on the front and the back and the hole centers of the corresponding bolt holes of the perforated lining plate C are ensured to be collinear, and the outer edges of the constraint component B and the perforated lining plate C are flush;
after the component B to be restrained, the perforated lining plate C, the built-in supporting steel plate A and gaps among the components are checked and adjusted to be in place correctly, the high-strength bolt is installed and screwed, and thus the primary assembly of the buckling restrained brace is completed;
step one is three: mounting the pin joint component D;
s1: first, mounting a lower pin joint component D:
sleeving a box body D-3 in a pin joint component D at the lower end on the lower end of the constraint component B, and preliminarily connecting a central hole-opened end plate D-1 of the pin joint component D at the lower end with a lower high-strength bolt A-5 of a built-in support steel plate A through a fixing nut;
s2: reinstalling the upper pin joint component D:
before the pin joint component D at the upper end is installed, firstly, an adjustable nut is screwed to a required position according to the axial length of the support to be controlled, then, a box body D-3 in the pin joint component D at the upper end is sleeved at the upper end of the constraint component B, and then, an end plate D-1 with a central opening of the pin joint component D at the upper end is preliminarily connected with an upper high-strength bolt A-4 of a built-in support steel plate A through the adjustable nut and a fixed nut;
step one is: final assembly of the assembled anti-buckling supporting system with the whole end part reinforced length adjustable;
adjusting the gap between the inner side surface of the wall plate of the box body D-3 and the outer side surface of the constraint component B, and after checking and adjusting the correct position, screwing and fixing the fastening nuts at the two ends on the upper high-strength bolt A-4 and the lower high-strength bolt A-5, thus finishing the final assembly of the assembled buckling-restrained brace system with the whole end part reinforced length adjustable;
step two: mounting the buckling restrained brace and the steel frame G;
the installation method is as follows:
before the buckling-restrained brace is installed, the perforated gusset plates F are welded with the steel frame G together, and the distance between the hole centers of the perforated gusset plates F at the two ends of each built-in supporting steel plate A is equal to the distance between the hole centers of the perforated flitch plates at the two ends of each built-in supporting steel plate A; accurately adjusting the position of an adjustable nut according to the actually measured length of the distance, completing the assembly of the assembled buckling-restrained brace with the end part reinforced length adjustable according to the steps, and inserting an elastic cylindrical pin E after the assembly of the brace is completed to install the buckling-restrained brace into a steel frame;
or adopting a second mounting mode parallel to the first mounting mode:
the buckling-restrained brace is connected with the perforated gusset plates F at two ends through the elastic cylindrical pins E, then the whole built-in supporting steel plate A provided with the perforated gusset plates F is hung into the steel frame G, the coaxial line of the built-in supporting steel plate A and the perforated gusset plates F at two ends is ensured, and then the perforated gusset plates F are connected with the steel frame G through welding seams.
According to the arrangement, the first step can be prefabricated in a factory, and the uniformity of precision in the preparation process of the supporting system is guaranteed. Other constitutions and connection relations are the same as those of any one of the first to seventh embodiments.
The specific implementation method nine: referring to fig. 1, the first embodiment is described, and in the second step of the first embodiment, when the buckling restrained brace is initially assembled, a gap of 1-2mm is left between the elongated groove B-3 of the restraining member B and the inserted steel plate supporting end stiffener a-2 of the built-in supporting steel plate a on each side in the thickness direction of the steel plate supporting end stiffener a-2. And the axial gap at the upper end is determined by the actually expected maximum interlayer side shift value (i.e., "reserved gap" in fig. 1) in the axial direction of the support steel plate a. For example, the maximum inter-floor horizontal lateral displacement may be the floor height 1/50, and then the support inclination (the inclination of the support axis relative to the horizontal plane) may be considered, so that the amount of clearance required for the support axis may be calculated. The lower end can be in direct contact without leaving a gap.
So set up, it is reasonable to be convenient for install and compromise the atress. Other constitutions and connection relationships are the same as those of any one of the first to eighth embodiments.
The detailed implementation mode is ten: in the second installation mode of the second step of the present embodiment, when the perforated gusset plate F and the perforated attachment plate D-4 are connected by the multilayer elastic cylindrical pin E at each end of the built-in supporting steel plate a, the hole center of the perforated attachment plate at each end is aligned with the hole center of the perforated gusset plate F, and then the outer layer heavy straight groove elastic cylindrical pin E-3, the middle layer heavy straight groove elastic cylindrical pin E-2 and the inner layer heavy rolled elastic cylindrical pin E-1 are sequentially installed; when the maximum supporting axial force is not less than 0.4 times of the shearing resistance bearing capacity of the outer layer heavy straight groove elastic cylindrical pin E-3 and the diameter of the pin hole is not less than 40mm, each end of the support can be connected by adopting three concentric layers of elastic cylindrical pins; when the maximum supporting axial force is less than 0.4 times of the shearing resistance bearing capacity of the outer layer heavy straight groove elastic cylindrical pin E-3 and the diameter of the pin hole is less than 40mm, the number of layers of the elastic pin can be reduced. In other cases, the connection can be realized by using three layers of concentric elastic cylindrical pins. When concentric multi-layer elastic pins are adopted, the notches of the two adjacent layers of elastic pins are staggered by at least 30 degrees around the center of the common pin hole, so that the hinged connection of the supporting end part and the steel frame is realized. So set up, be convenient for select the elasticity cylindric lock of suitable quantity according to the use operating mode of difference. Other components and connection relationships are the same as those in any one of the first to ninth embodiments.
Example (b):
the invention relates to an assembled buckling restrained brace system with an elastic pin connecting end part and an adjustable reinforcing length, which mainly comprises the following five aspects according to a manufacturing sequence:
1) manufacturing a built-in steel plate support with square connecting plates, stiffening ribs and high-strength bolts welded at two ends;
2) manufacturing a pin joint component, a constraint component and a lining plate by reinforcing the upper end and the lower end;
3) the gap between the built-in steel plate support and the restraint member is reserved, and the gap between the upper end reinforcing pin joint component and the lower end reinforcing pin joint component and the restraint member is reserved;
4) the fastening nut, the adjustable nut, the diameter of the bolt and the pin shaft and the diameter of the corresponding bolt hole and the pin hole are arranged;
5) and (4) connecting the end parts with the elastic pins to reinforce the assembly of the assembled buckling restrained brace system with adjustable length.
The specific implementation process is as follows:
1) and (3) manufacturing a built-in steel plate support with square connecting plates, stiffening ribs and high-strength bolts welded at two ends:
and cutting and blanking the steel plate required in the manufacturing of the steel plate support and the stiffening rib. During actual manufacturing, the steel plate support and the stiffening ribs can be blanked by adopting the same steel plate. And cutting and blanking the connecting plate. A bolt rod of a high-strength bolt with upper and lower ends is prepared.
And planing edges of the steel plate support, and flattening the edges of the stiffening ribs. The support and stiffening ribs are then welded. The section of the support where the stiffening ribs are arranged is an elastic section, and the section without the stiffening ribs is a yielding section. The stiffening ribs and the steel plate supports at the end parts are connected with the square connecting plate through butt welding seams, and the steel plate supports are accurately positioned before welding to ensure that the axis of the steel plate supports passes through the central point of the square connecting plate. And (4) continuing to perform accurate positioning, and ensuring that the axis of the bolt rod of the high-strength bolt at the upper end and the lower end is coaxial with the axis of the steel plate support. And then, connecting the end parts of the bolt rods of the high-strength bolts at the upper end and the lower end with the square connecting plate through a circumferential welding seam.
In order to ensure reasonable and safe support stress, the design values of the axial tension and pressure bearing capacity of the end stiffening ribs and the butt weld of the steel plate support and the square connecting plate, the design values of the axial tension and pressure bearing capacity of the circumferential weld of the upper and lower high-strength bolts and the square connecting plate, and the design values of the axial bearing capacity of the upper and lower high-strength bolts are higher than the maximum axial bearing capacity of the steel plate support after considering strain hardening and the like.
2) Manufacturing the upper end and the lower end reinforcing pin joint component, the restraint member and the lining plate:
if the box-shaped section adopts the hot-rolled rectangular pipe, the box-shaped section can be directly cut into the hot-rolled rectangular pipe according to the required length for blanking. If the box-shaped section is formed by welding four wall plates with equal thickness, the wall plates are subjected to blanking cutting, and edges such as grooves are processed on the wall plates. Cutting and blanking a steel plate used for the central perforated end plate, and then perforating the middle part, wherein the aperture is 2-3mm larger than the diameter of the high-strength bolts at the upper end and the lower end of the steel plate support end part. And cutting and perforating steel plates used by the ear plates with holes and the flitch plates with holes, and processing the edges of the welding seams with proper grooves. After the cutting and the hole forming are finished, the four wall plates are welded together by adopting butt welding seams to form a box-shaped section, and then the box-shaped section is connected with the central hole forming end plate by adopting the butt welding seams. Then, the perforated flitch plate is welded with the perforated lug plate through the circumferential welding seam. Finally, the ear plate with the hole is welded with the end plate with the central hole by adopting butt welding, thus finishing the manufacture of the pin joint component with reinforced upper end and reinforced lower end. In practical engineering application, in order to ensure that each end reinforcing pinned component can provide reliable bending resistance for the end, the length of each end pinned component sleeved on the constraint component is preferably not less than the larger value of the external profile dimension of the constraint component in the two main shaft directions of the self section.
In order to ensure reasonable and safe support stress, the design values of the total shearing bearing capacity of the circumferential welding seams of the two porous flitch plates and the two porous lug plates and the total axial bearing capacity of the butt welding seams of the two porous lug plates and the central hole-opened end plate are higher than the maximum axial bearing capacity of the steel plate support after considering strain hardening and other reinforcement.
In order to realize the assembly of the front and back constraint components, the steel plate is firstly blanked, holed and grooved, thereby manufacturing the steel plate with the holes and the holes at the end part. And (4) slotting the wall surface of one side of the rectangular steel pipe to manufacture the rectangular steel pipe with the slotted end part. The length of the upper end open slot is larger than that of the lower end open slot, and the length and the width of the open slot of the end open slot steel plate and the open slot of the end open slot rectangular steel pipe are the same at the upper end or the lower end. The restraining component on the front side or the back side is formed by welding an end-slotted perforated steel plate and an end-slotted rectangular steel pipe.
And (4) blanking and perforating the steel plates used by the perforated lining plate and the perforated thin lining plate.
The perforated lining plate and the steel plate support are made of steel plates with the same thickness, and the same steel plate can be considered for blanking in actual manufacturing. The thickness of the perforated thin liner is determined by the gap to be left in the thickness direction of the steel plate support.
3) The gap between the built-in steel plate support and the restraint member is reserved, and the gap between the upper end reinforcing pin joint component and the lower end reinforcing pin joint component and the restraint member is reserved;
in order to prevent the restraining component and the perforated lining plate from being extruded after the steel plate support is transversely deformed along the width direction and the thickness direction of the steel plate due to the Poisson effect when the steel plate support is axially pressed, proper gaps are reserved between the steel plate support and the restraining component in the vertical support axial direction. Keeping a gap between the steel plate support and the lining plate along the width direction of the steel plate support plate by controlling the widths of the perforated lining plate and the perforated thin lining plate; a gap between the steel plate support and the constraining member in the thickness direction of the steel plate support is left by controlling the thickness of the perforated thin liner. In order to realize the free deformation of the built-in support in the axial direction and avoid the support from extruding the constraint component along the axial direction, an axial gap is reserved between the lower end of the stiffening rib at the upper part of the steel plate support and the lower ends of the steel plate with the slotted hole at the end part and the slotted rectangular steel pipe at the upper part of the constraint component along the support axial direction.
In the axial direction of the vertical support, gaps of 1-2mm are reserved between the inner side surface of the upper end strengthening pin joint component and the outer side surface of the upper end of the restraint component and between the inner side surface of the lower end strengthening pin joint component and the outer side surface of the lower end of the restraint component.
In order to facilitate installation and take stress into consideration reasonably, the thickness of the perforated node plate at each end of the support is 1-2mm smaller than the clear distance between the two perforated veneers.
4) Fastening nut, adjustable nut to and the diameter of bolt and round pin axle and the setting of the diameter that corresponds bolt hole and pinhole:
the fastening nut and the adjustable nut are both high-strength nuts, and the fastening nut is ensured to be finally screwed according to the specification of the bolt in the final assembly construction of the support, so that the connection is ensured to be tight and reliable. In addition, in order to further improve the tightness of the bolt connection, high-strength locknuts with self-locking function are also proposed for all the fastening nuts and the adjustable nuts.
In order to facilitate the assembly and ensure that the high-strength bolt and the pin roll are reasonably stressed, the aperture of the hole on the steel plate can be set as follows.
The bolt holes formed by assembling the front and back constraint components, the perforated lining plate and the perforated thin lining plate are reserved according to the standard hole of the high-strength bolt.
The aperture of the central opening end plate is 2-3mm larger than the diameter of the high-strength bolt at the end part of the steel plate support.
The aperture of the ear plate with holes is 6-10mm larger than that of the pasting plate with holes.
The aperture of the sticking plate with holes is strictly the same as that of the node plate with holes, and the aperture of the sticking plate with holes and the aperture of the node plate with holes are both 0.5-0.9mm smaller than the outer diameter of the elastic cylindrical pin at the outer layer.
5) The assembly of the assembled buckling restrained brace system with the length adjustable is strengthened at the connecting end part of the elastic pin:
when the steel plate support is assembled, the restraint member on the back is placed on a horizontal plane (the end part is provided with the slotted steel plate at the upper side), and then the steel plate support, the perforated lining plates on the two sides of the steel plate support and the perforated thin lining plates are sequentially placed on the restraint member on the back in a coplanar manner. After the primary correct positioning, the front binding member is continuously stacked on the front binding member, and the front binding member and the back binding member are correctly positioned, so that the hole centers of the corresponding bolt holes of the perforated lining plate and the perforated thin lining plate are collinear, and the outer edges of the binding member, the perforated lining plate and the perforated thin lining plate are strictly flush. After the restraining component, the lining plate, the built-in steel plate support, the gap between the parts and the like are checked and adjusted to be in place correctly, the high-strength bolt is installed and screwed, and therefore the primary assembly of the buckling restrained brace is completed. Then, the box section in the lower end strengthening pinned joint component is sleeved on the lower end constraint component, and the central opening end plate of the lower end strengthening pinned joint component is preliminarily connected with the lower end high-strength bolt of the steel plate support through a fixing nut. Before the upper end reinforcing pinned component is installed, an adjustable nut is screwed to a required position according to the axial length of the support to be controlled, then the box-shaped section in the upper end reinforcing pinned component is sleeved on the upper end restraining component, and then the central hole-opening end plate of the upper end reinforcing pinned component is preliminarily connected with the upper end high-strength bolt of the steel plate support through the adjustable nut and a fixing nut. And finally, adjusting the gap between the inner side surface of the box-section wall plate and the outer side surface of the constraint component, checking and adjusting to be in place correctly, and then screwing and fixing the fastening nuts at the two ends, so that the final assembly of the assembled buckling-restrained brace with the whole end part reinforced length adjustable is completed. If the support needs to be disassembled, the fixing nut and the bolt can be unscrewed, and the components can be disassembled according to the reverse order of the installation.
The supports are installed into the steel frame (usually formed by welding steel beams and steel columns) in two ways, wherein one way is that before the supports are installed, the perforated gusset plates and the steel frame can be welded together, and in order to control the supports to be accurately in place and smoothly installed in the steel frame, the hole centers of the perforated gusset plates at the two ends of each support are equal to the hole centers of the perforated flitch plates at the two ends of each support. In practical application, considering that the distance between the hole centers of the two perforated gusset plates at each supporting end part and the steel frame can be difficult to accurately control in welding, in order to ensure that the support is accurately in place and smoothly installed, it is recommended that before the support assembly is completed, the distance between the hole centers of the two perforated gusset plates and the steel frame should be accurately connected in a welding manner (the distance between the hole centers of the two perforated gusset plates is ensured to be equal to the distance between the hole centers of the two perforated attachment plates at the two supporting ends in the welding manner) and the distance between the hole centers of the two gusset plates (namely the axial length size of the support which actually needs to be controlled) should be further accurately determined through actual measurement after the welding of the gusset plates is completed. And then, accurately adjusting the position of the adjustable nut according to the accurate measured length, finishing the assembly of the assembled buckling-restrained brace with the end part reinforced length adjustable according to the steps, and after the assembly of the brace is finished, assembling the brace into the steel frame. Secondly, the support is connected with the perforated node plates at two ends through the elastic cylindrical pins, then the whole support provided with the perforated node plates is hung into the steel frame, the coaxial line of the support and the perforated node plates at two ends is ensured, and then the perforated node plates are connected with the steel frame through welding seams.
When the perforated gusset plate and the perforated flitch are connected by three layers of elastic cylindrical pins at each end of the support, the hole center of the perforated flitch of each end steel support is aligned with the hole center of the perforated gusset plate, and then the outer layer elastic cylindrical pins, the middle layer elastic cylindrical pins and the inner layer elastic cylindrical pins are sequentially arranged. When the maximum supporting axial force is not less than 0.4 time of the shearing resistance bearing capacity of the outer layer heavy straight-groove elastic cylindrical pin E-3 and the diameter of a pin hole is not less than 40mm, each end of the support can be connected by adopting three concentric layers of elastic cylindrical pins, and the outer layer and the middle layer adopt heavy straight-groove elastic cylindrical pins; the inner layer adopts a heavy-duty rolled elastic cylindrical pin. When the maximum supporting axial force is less than 0.4 times of the shearing resistance bearing capacity of the outer layer heavy straight groove elastic cylindrical pin E-3 and the diameter of the pin hole is less than 40mm, the number of layers of the elastic pin can be properly reduced. In other cases, the connection can be realized by using three layers of concentric elastic cylindrical pins. When concentric multi-layer elastic pins are adopted, the notches (or the starting positions) of the two adjacent layers of elastic pins are staggered by at least 30 degrees around the center of the common pin hole (for example, the notches are staggered by 180 degrees between the first layer and the second layer, and the notches are staggered by 90 degrees between the second layer and the third layer). In this way, a hinged connection of the support end to the steel frame is achieved. When the support is connected to the steel frame by means of the perforated gusset plate, the shape and size of the gusset plate may vary depending on the inclination of the support axis relative to the horizontal.
Before assembly, the surface of the steel plate support is derusted, and then high-temperature-resistant and ageing-resistant lubricating grease is coated on the surface of the steel plate support, so that the friction force between the steel plate support and the constraint member and the lining plate is reduced, and the steel plate support is prevented from being rusted.
The working principle of the present invention is explained in connection with fig. 1 to 38:
the assembled buckling restrained brace with the elastic pin connection end part and the reinforced length adjustable is a novel buckling restrained brace which has the advantages that the built-in steel plate brace yields and consumes energy, and the upper end part and the lower end part are reinforced and can be pinned with components and restraining components to provide lateral restraint. Can adopt elasticity cylindric lock connected mode through steel sheet support tip, strengthen length adjustable equipment buckling restrained brace with the tip and be connected with the steel framework.
The floor shearing force applied to the support is borne by the built-in steel plate support in the form of axial stress. When the assembled buckling restrained brace with the reinforced length at the connecting end part of the elastic pin and adjustable is laterally moved to work on a floor not exceeding the axial yielding displacement of the corresponding brace, the built-in steel plate brace does not yield, and the brace is in elasticity; when the floor interlayer lateral movement exceeds the interlayer lateral movement corresponding to the axial yielding displacement of the support, the built-in support yields, namely, the energy is consumed through the accumulated plastic development of the yielding section of the built-in support. The perforated gusset plate, the elastic cylindrical pin, the stiffening rib, the square connecting plate and the high-strength bolt are always in elasticity, and the upper end and the lower end of the stiffening rib are strengthened and can be in pin joint with the component, the constraint component, the perforated lining plate, the perforated thin lining plate and the elastic section of the support.
In addition, the buckling restrained brace integrally manufactured by the constraint components such as concrete or mortar filled in the steel pipe commonly used at present has high manufacturing quality control difficulty, is not beneficial to overhauling and replacing the built-in brace, and is difficult to recycle other parts after the built-in steel plate brace is subjected to low-cycle fatigue fracture. The assembled structure is adopted, so that the welding operation of the support component parts is completed in a factory, the manufacturing, assembling and mounting quality is easily ensured, the good anti-seismic performance of the anti-buckling support is favorably exerted as far as possible, the built-in support is convenient to overhaul and replace, and other parts which are kept intact can still be repeatedly utilized even if the built-in steel plate support is subjected to low-cycle fatigue fracture.
The end of the commonly used anti-buckling support is usually connected with the steel frame through a welding seam group or a bolt group, the support end is substantially rigidly connected, which is inconsistent with the assumption of end hinging commonly adopted in support design and analysis, and after the support frame structure moves horizontally, the support bears the axial force and bending moment, which is unfavorable for the support stress. The elastic cylindrical pins are used for connection, so that the boundary condition of hinging the two ends of the buckling restrained brace is realized, the boundary condition is consistent with the end part hinging condition adopted in the design and analysis of the brace, the brace is not affected by end bending moment, and the stress performance of the brace can be improved.
After the end part of the existing anti-buckling support is connected with the frame, due to the fact that the bending resistance of the exposed section of the steel plate support at the support end part is insufficient, after the structure is subjected to large horizontal side movement, local bending damage of the support end part often occurs, and therefore the energy consumption capability and ductility of the support are deteriorated. After the end part of the buckling-restrained brace is provided with the reinforcing part with the pin hole, the bending resistance of the exposed section of the steel plate brace at the end part of the brace can be greatly improved, the local bending damage of the end part of the brace after large horizontal side movement is avoided, the energy consumption capability and the ductility of the brace are improved, and meanwhile, the pin hole is convenient for realizing hinged connection.
In the current practical engineering application, when the end parts of the steel supports are hinged and connected by adopting common solid cylindrical pins, the gap between the pin shaft and the wall of the hole is difficult to control accurately due to the manufacturing errors of the hole of the connecting plate and the diameter of the pin shaft, the large gap often causes the support stress to slide, so that the lateral resistance and the energy consumption capacity of the support are influenced, and the stress characteristic of the support is difficult to predict accurately due to the large gap. When the elastic cylindrical pin is adopted to replace a common solid cylindrical pin to realize the hinged connection of the end parts of the steel support, even if errors exist in the hole forming of the connecting plate, because the original diameter of the elastic pin is slightly larger than the diameter of the pin hole, after the elastic pin is extruded into the pin hole, no gap exists between the pin shaft and the hole wall, the support can be effectively prevented from sliding under the stress of the support, the side resistance and the energy consumption capability of the support can be ensured, and the stress characteristic of the support can be accurately predicted. Particularly, when the pin shaft is formed by combining a plurality of layers of straight grooves and the coiled elastic cylindrical pins, the bearing capacity and the deformation capacity of the pin shaft can be flexibly controlled.
When the support is installed in a steel frame in actual engineering, for the integrally manufactured anti-buckling support, the requirement on the precision of connection manufacturing of the support and the end part is high in order to ensure that the support has fixed axial length and is smoothly installed after being manufactured. In particular, there may be the possibility that the support is difficult to mount in the frame due to the lack of adjustability in the axial dimensional tolerances resulting from tolerances in the manufacture of the support and the end connection parts, etc. Even if the support is installed forcibly when the error is not large, large initial stress is generated after the support is installed, and the support stress is unfavorable. After the assembled buckling restrained brace with the adjustable nuts is adopted, the axial length of the brace along the brace can be adjusted properly and flexibly according to the distance between the pin holes in the node plates with holes at two ends, the precision requirements for the connection and the manufacture of the brace and the end part are greatly reduced, the brace is convenient to accurately place and install in a frame, initial stress generated after the brace is installed can be avoided as much as possible, and the stress performance of the brace is improved.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims (10)

1. The utility model provides an adjustable buckling restrained brace system of length is strengthened to spring pin joint tip which characterized in that: it comprises a built-in supporting steel plate (A), two constraint components (B), a perforated lining plate (C), two pin joint components (D), an elastic cylindrical pin (E) and a perforated gusset plate (F),
the two restraining components (B) are respectively a front restraining component and a back restraining component, the front restraining component and the back restraining component are arranged on the upper end face and the lower end face of a built-in supporting steel plate (A) in the length direction, an opening lining plate (C) is arranged in a gap between the built-in supporting steel plate (A) and the restraining component (B), two pin joint parts (D) are respectively sleeved on one end part of the built-in supporting steel plate (A) in the length direction, the pin joint parts (D) are hinged with a perforated node plate (F) through elastic cylindrical pins (E), the supporting steel plate (A) is adjustable in length relative to the restraining components (B) in the axial direction of the supporting steel plate (A), and the assembled anti-buckling supporting system is connected with a steel frame (G);
the built-in supporting steel plate (A) comprises a steel plate supporting body (A-1), a plurality of steel plate supporting end stiffening ribs (A-2), two square connecting plates (A-3), an upper high-strength bolt (A-4) and a lower high-strength bolt (A-5), wherein the steel plate supporting body (A-1) is of a long strip shape, the left end part and the right end part of the steel plate supporting body (A-1) are respectively and vertically provided with the two steel plate supporting end stiffening ribs (A-2), the two end parts of the steel plate supporting body (A-1) are respectively provided with one square connecting plate (A-3), and the upper high-strength bolt (A-4) and the lower high-strength bolt (A-5) are respectively and fixedly arranged on the outer end surfaces of the two square connecting plates (A-3);
the restraint member (B) comprises a rectangular steel pipe (B-1) and a restraint steel plate (B-2), the restraint steel plate (B-2) is fixedly installed on the rectangular steel pipe (B-1), two end parts of the rectangular steel pipe (B-1) and the restraint steel plate (B-2) are respectively provided with a strip-shaped groove (B-3), the strip-shaped grooves (B-3) are communicated with an inner cavity of the rectangular steel pipe (B-1), the strip-shaped grooves (B-3) are used for being inserted with steel plate supporting end stiffening ribs (A-2), the width of the restraint steel plate (B-2) is larger than that of the rectangular steel pipe (B-1), and the restraint steel plate (B-2) is provided with a plurality of bolt holes (B-4) at equal intervals along the length direction of the restraint steel plate (B-2);
the perforated lining plate (C) comprises a first perforated lining plate (C-1) and a second perforated lining plate (C-2), two constraint components (B) are radially arranged in the vertical direction by taking a built-in supporting steel plate (A) as a reference, the first perforated lining plate (C-1) and the second perforated lining plate (C-2) are stacked up and down, the first perforated lining plate (C-1) and the second perforated lining plate (C-2) are arranged in a gap between the constraint steel plates (B-2) of the two constraint components (B), and the constraint components (B) and the perforated lining plates (C) are screwed and connected through friction type high-strength bolts;
the pin joint component (D) comprises a central hole-opening end plate (D-1), two hole-opening ear plates (D-2), a box body (D-3) and two hole-opening flitch plates (D-4), wherein the box body (D-3) is a rectangular box body with two open ends, the central hole-opening end plate (D-1) is fixedly arranged at one open side of the box body (D-3) in a welding mode, the two hole-opening ear plates (D-2) are oppositely arranged, one end of each hole-opening ear plate is vertically and fixedly arranged at the outer side of the central hole-opening end plate (D-1), one hole-opening flitch plate (D-4) is arranged at the inner side of each hole-opening ear plate (D-2), and the two hole-opening ear plates (D-2) and the two hole-opening flitch plates (D-4) are coaxial;
the elastic cylindrical pin (E) is at least one layer of elastic cylindrical pin.
2. The system of claim 1 wherein the spring pinned end reinforced length adjustable buckling restrained brace system comprises: the upper high-strength bolt (A-4) and the lower high-strength bolt (A-5) are fixedly arranged on the outer end surfaces of the two square connecting plates (A-3) respectively in a welding mode of performing girth welding around the whole periphery of the bolt head.
3. The system of claim 1 or 2, wherein the flexible pinned end reinforced length adjustable buckling restrained brace system comprises: the thickness of the second perforated lining board (C-2) is less than or equal to that of the first perforated lining board (C-1).
4. The system of claim 3 wherein the flexible pinned end reinforced length adjustable buckling restrained brace system comprises: a gap is reserved between the elongated groove (B-3) and the stiffening rib (A-2) inserted at the supporting end part of the steel plate.
5. The system of claim 1 or 4, wherein the flexible pinned end reinforced length adjustable buckling restrained brace system comprises: when the elastic cylindrical pins (E) are two layers, the two elastic cylindrical pins (E) are sleeved, and the openings of the two elastic cylindrical pins (E) are staggered by at least 30 degrees.
6. The system of claim 1 or 4, wherein the flexible pinned end reinforced length adjustable buckling restrained brace system comprises: when the elastic cylindrical pins (E) are larger than two layers, the elastic cylindrical pins (E) are sequentially sleeved from outside to inside, and the openings of two adjacent elastic cylindrical pins (E) are staggered by at least 30 degrees around the center of the pin hole.
7. The system of claim 1 or 4, wherein the flexible pinned end reinforced length adjustable buckling restrained brace system comprises: when the elastic cylindrical pin (E) is three layers, the elastic cylindrical pin (E) comprises an inner layer heavy type rolling elastic cylindrical pin (E-1), a middle layer heavy type straight groove elastic cylindrical pin (E-2) and an outer layer heavy type straight groove elastic cylindrical pin (E-3), wherein the inner layer heavy type rolling elastic cylindrical pin (E-1), the middle layer heavy type straight groove elastic cylindrical pin (E-2) and the outer layer heavy type straight groove elastic cylindrical pin (E-3) are sequentially sleeved from outside to inside;
wherein, the interval between the opening directions of the middle layer heavy straight groove elastic cylindrical pin (E-2) and the outer layer heavy straight groove elastic cylindrical pin (E-3) is at least 30 degrees, and the interval between the inner layer heavy rolled elastic cylindrical pin (E-1) and the middle layer heavy straight groove elastic cylindrical pin (E-2) is at least 30 degrees.
8. A method for installing the spring pin connection end part reinforced length-adjustable buckling restrained brace system based on any one of claims 1 to 7, which is characterized in that: it comprises the following steps:
the method comprises the following steps: assembling the anti-buckling supporting system with the end part reinforced and the length adjustable through the elastic pin;
the method comprises the following steps: pretreatment before assembly;
derusting the surface of a steel plate support body (A-1) of a built-in support steel plate (A), then coating high-temperature-resistant and aging-resistant lubricating grease on the surface of the steel plate support body, reducing the friction force between the steel plate support body (A-1) and a constraint component (B) and a perforated lining plate (C) and preventing the steel plate support from being rusted;
the first step is: preliminarily assembling the buckling restrained brace;
firstly, a restraining component (B) on the back side is placed on a horizontal plane, and a restraining steel plate (B-2) faces upwards;
then, the built-in supporting steel plate (A) and the perforated lining plates (C) on the two sides of the steel plate support are sequentially placed on the restraining component (B) on the back face in a coplanar manner;
after the primary correct positioning, the front constraint component (B) is continuously stacked on the front surface, at the moment, the front constraint steel plate (B-2) faces downwards and is correctly positioned, the front and back constraint components (B) and the hole centers of the corresponding bolt holes of the perforated lining plate (C) are ensured to be collinear, and the outer edges of the constraint component (B) and the perforated lining plate (C) are flush;
after the component (B) to be restrained, the perforated lining plate (C), the built-in supporting steel plate (A) and the gaps among the components are checked and adjusted to be positioned correctly, the high-strength bolt is installed and screwed, so that the primary assembly of the buckling restrained brace is completed;
step one is three: mounting a pin joint component (D);
s1: first install lower pin joint component (D):
sleeving a box body (D-3) in a pin joint component (D) at the lower end on the lower end of the restraint member (B), and preliminarily connecting a central opening end plate (D-1) of the pin joint component (D) at the lower end with a lower high-strength bolt (A-5) of a built-in support steel plate (A) through a fixing nut;
s2: and a pin connection part (D) for mounting the upper part:
before the support is arranged in a pin joint component (D) at the upper end, an adjustable nut is screwed to a required position according to the support axial length size required to be controlled, then a box body (D-3) in the pin joint component (D) at the upper end is sleeved at the upper end of a restraint member (B), and a central hole-opening end plate (D-1) of the pin joint component (D) at the upper end is preliminarily connected with an upper high-strength bolt (A-4) of a built-in support steel plate (A) through the adjustable nut and a fixed nut;
step one is as follows: final assembly of the assembled anti-buckling supporting system with the whole end part reinforced length adjustable;
adjusting the gap between the inner side surface of the wall plate of the box body (D-3) and the outer side surface of the constraint component (B), and after checking and adjusting to be in place correctly, screwing and fixing the fastening nuts at the two ends on the upper high-strength bolt (A-4) and the lower high-strength bolt (A-5), so that the final assembly of the assembled buckling restrained brace system with the whole end part reinforced length adjustable is completed;
step two: the buckling restrained brace and the steel frame (G) are installed;
the installation method is as follows:
before the buckling-restrained brace is installed, the perforated gusset plates (F) are welded with the steel frame (G), and the distance between the hole centers of the perforated gusset plates (F) at the two ends of each built-in supporting steel plate (A) is equal to the distance between the hole centers of the perforated flitch plates at the two ends of the built-in supporting steel plate (A); accurately adjusting the position of an adjustable nut according to the actually measured length of the distance, completing the assembly of the assembled buckling-restrained brace with the end part reinforced length adjustable according to the steps, and inserting an elastic cylindrical pin (E) after the assembly of the brace is completed to install the buckling-restrained brace into a steel frame;
or adopting a second installation mode parallel to the first installation mode:
the buckling-restrained brace is connected with the perforated gusset plates (F) at two ends through the elastic cylindrical pins (E), then the whole built-in supporting steel plate (A) provided with the perforated gusset plates (F) is hung in the steel frame (G), the coaxial line of the built-in supporting steel plate (A) and the perforated gusset plates (F) at two ends is ensured, and then the perforated gusset plates (F) are connected with the steel frame (G) through welding seams.
9. The method of installing the buckling-restrained brace system according to claim 8, wherein: in the second step, during the initial assembly of the buckling restrained brace,
a gap of 1-2mm is reserved between the elongated groove (B-3) of the constraint component (B) and the inserted steel plate supporting end stiffening rib (A-2) of the built-in supporting steel plate (A) along each side of the thickness direction of the steel plate supporting end stiffening rib (A-2).
10. The method of installing the buckling-restrained brace system according to claim 9, wherein: in the second installation mode of the second step,
when a porous gusset plate (F) and a porous flitch plate (D-4) are connected by adopting a plurality of layers of elastic cylindrical pins (E) at each end of a built-in supporting steel plate (A), the hole center of the porous flitch plate at each end is aligned with the hole center of the porous gusset plate (F), and then an outer layer heavy straight-groove elastic cylindrical pin (E-3), a middle layer heavy straight-groove elastic cylindrical pin (E-2) and an inner layer heavy coiled elastic cylindrical pin (E-1) are sequentially arranged;
when the maximum supporting axial force is not less than 0.4 times of the shearing-resistant bearing capacity of the outer layer heavy straight-groove elastic cylindrical pin (E-3) and the diameter of the pin hole is not less than 40mm, each end of the support can be connected by adopting three concentric layers of elastic cylindrical pins;
when the maximum supporting axial force is less than 0.4 times of the shearing-resistant bearing capacity of the outer layer heavy straight-groove elastic cylindrical pin (E-3) and the diameter of the pin hole is less than 40mm, the number of layers of the elastic pin can be reduced;
when concentric multi-layer elastic pins are adopted, the notches of the two adjacent layers of elastic pins are staggered by at least 30 degrees around the center of the common pin hole, so that the hinged connection of the supporting end part and the steel frame is realized.
CN202210111603.3A 2022-01-29 2022-01-29 Anti-buckling support system with elastic pin connecting end part being reinforced and adjustable in length and installation method Active CN114263291B (en)

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