CN115012547A - Flexible constraint type assembled buckling-restrained brace structure based on SMA bolt - Google Patents
Flexible constraint type assembled buckling-restrained brace structure based on SMA bolt Download PDFInfo
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- CN115012547A CN115012547A CN202210765785.6A CN202210765785A CN115012547A CN 115012547 A CN115012547 A CN 115012547A CN 202210765785 A CN202210765785 A CN 202210765785A CN 115012547 A CN115012547 A CN 115012547A
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/18—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons
- E04B1/30—Structures comprising elongated load-supporting parts, e.g. columns, girders, skeletons the supporting parts being composed of two or more materials; Composite steel and concrete constructions
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/38—Connections for building structures in general
- E04B1/58—Connections for building structures in general of bar-shaped building elements
- E04B1/5806—Connections for building structures in general of bar-shaped building elements with a cross-section having an open profile
- E04B1/5812—Connections for building structures in general of bar-shaped building elements with a cross-section having an open profile of substantially I - or H - form
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0215—Bearing, supporting or connecting constructions specially adapted for such buildings involving active or passive dynamic mass damping systems
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0237—Structural braces with damping devices
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
Abstract
The invention provides a flexible constraint type fabricated anti-curvature support structure based on SMA bolts, which solves the problems that the material thickness of a core component and a constraint cover plate of the traditional fabricated BRB is thick, and meanwhile, the core component has higher difficulty in self-restoration after deformation and longer recovery time. According to the invention, the SMA bolts are used as the high-strength bolts at a part of stress nodes, so that the thickness of the cushion block is reduced, the inner core can be in contact with the constraint cover plate in advance to generate flexible deformation when deforming, multipoint contact is formed as soon as possible, and the overlong time of stress concentration on the constraint cover plate is avoided. After the deformation of the inner core member reaches the peak and the external force action is lost, the elastic resilience strain-recoverable reaction force of the SMA bolt can be utilized to enable the restraining cover plate to recover the initial state. Compared with the common BRB, the invention can reduce the thickness of the restraining cover plate when bearing the same load, thereby reducing the steel consumption of the BRB and achieving the purposes of saving energy, reducing material and reducing weight.
Description
Technical Field
The invention relates to the technical field of anti-buckling supports, in particular to a flexible constraint type assembled anti-buckling support structure based on SMA bolts.
Background
The anti-buckling support (BRB) mainly comprises an inner core component and a peripheral constraint system, wherein the inner core component bears axial force, and the peripheral system is utilized to constrain the transverse displacement of the inner core component, so that the inner core component can generate full-section yielding under the action of axial pressure, and thus the stress performance with symmetrical tension and compression is obtained. Under a normal use state and a small earthquake, the BRB plays a supporting role of a common central support and provides lateral stiffness for a building structure; under the action of a large shock, the BRB can dissipate the energy input by earthquake through repeated tension and compression hysteresis. The fabricated buckling restrained brace is receiving more and more attention from the academic world due to the advantages of convenient connection and light weight, and various section forms are developed.
Although the assembled BRB has been widely researched and applied, it still has certain design difficulties and space for optimization: the currently common assembly type BRB adopts cushion blocks and steel high-strength bolts to assemble a peripheral restraint system and an inner core energy consumption component, and simultaneously controls the size of a gap between the restraint system and the inner core component by adjusting the height of the cushion blocks, so that the aims of optimizing the local stress level of the restraint system, the compression deformation mode of the inner core component and the like are fulfilled. Research has shown that: on one hand, the clearance between the inner core and the peripheral constraint system is properly increased, so that the inner core component is easy to generate multi-wave deformation, and the generation and development of the yield section full-section plastic deformation of the inner core component are facilitated; at the same time, however, the larger the gap, the larger the pressing force of the inner core to the peripheral member will be, and the peripheral member will be at a higher stress level, so that it is necessary to increase the cross-sectional area of the constraining member or add a stiffener to ensure sufficient constraining rigidity. On the other hand, the reduction of the gap can effectively control the extrusion force of the inner core to the peripheral component and optimize the stress of the peripheral component; but also can limit the multi-wave deformation of the yielding section of the inner core, which is not beneficial to the hysteretic energy consumption of the BRB inner core and the stress performance of the overhanging section of the BRB inner core, so that the section area of the overhanging section of the inner core must be increased or an additional rotation restraining component must be arranged on the overhanging section.
All the external constraint cover plates and the inner core members of the traditional assembled BRB are connected through common high-strength bolts, so that the time before the inner core members and the constraint cover plates are contacted is long, the deformation of the inner core members is large, and the multi-wave buckling deformation (a 5 and b5 states specially provided in figure 11) occurs late, so that the duration time of the state that the inner core members and the constraint cover plates are contacted in a single point is too long, the duration time of the local compression of the single point of the constraint cover plates is long, the strength requirements on the inner core members and the constraint cover plates by the factors are higher, the thickness of a base plate and the material thickness of the constraint cover plates which need to be manufactured are thicker, the material cost is not saved, and meanwhile, the difficulty of self restoration of the inner core members after deformation is large, and the recovery time is longer.
Disclosure of Invention
In order to solve the problems that the traditional assembled BRB has thicker material thickness of an inner core component and a constraint cover plate, and the inner core component has higher difficulty in self-restoration after deformation and longer restoration time in the background technology, the invention provides a flexible constraint type assembled anti-curvature support structure based on an SMA bolt.
The technical scheme of the invention is as follows: a flexible constraint type assembled anti-curvature supporting structure based on SMA bolts comprises a peripheral constraint component and an inner core component, wherein the inner core component comprises a core plate extending along the left and right directions;
the peripheral restraining component comprises two restraining cover plates extending along the left-right direction, the two restraining cover plates are respectively arranged at the upper side and the lower side of the core plate, and the left-right length of the restraining cover plates is smaller than that of the core plate so that the left end and the right end of the core plate can extend to the outside of the restraining cover plates;
the constraint cover plate is provided with two rows of second screw holes which are arranged at intervals front and back and are arranged along the left and right direction, high-strength bolts and SMA bolts are alternately penetrated in the second screw holes arranged along the left and right direction, the SMA bolts are made of shape memory alloy, and the high-strength bolts are penetrated in the second screw holes positioned at the left and right ends;
the front side and the rear side of the core plate are provided with backing plate structures at intervals along the left and right directions, one side of each backing plate structure, facing the core plate, is connected with the core plate in an abutting mode, and the thickness of each backing plate structure is larger than that of the core plate so as to provide an initial deformation space for the core plate;
a plurality of first screw holes which are through up and down are arranged on the base plate structure at intervals along the left-right direction, the first screw holes correspond to the second screw holes up and down, the first screw holes are used for high-strength bolts and SMA bolts to pass through, and the SMA bolts pass through the second screw holes and the first screw holes to fasten and connect the constraint cover plate and the base plate;
the length between the nut and the hexagonal screw head of the high-strength bolt is greater than the sum of the thicknesses of the backing plate structure and the two constraint cover plates, and the length between the nut and the hexagonal screw head of the high-strength bolt is less than or equal to the maximum restorable elastic length of the SMA bolt.
Preferably, the high-strength bolts and the SMA bolts are alternately arranged in the second screw holes in the left and right directions.
Preferably, a circle center connecting line of the two second screw holes is superposed with a left bisector and a right bisector of the constraint cover plate, and the SMA bolts are arranged in the two second screw holes on the left bisector and the right bisector of the constraint cover plate in a penetrating mode.
Preferably, a through positioning hole is formed in the cross center of the diagonal line of the constraint cover plate, and the positioning hole is located on the left halving line and the right halving line of the constraint cover plate;
the upper side and the lower side of the diagonal cross center of the core plate are both vertically and fixedly provided with positioning columns, the positioning columns are inserted into the positioning holes, and the positioning columns are used for preventing the core plate from translating left and right between the two constraint cover plates when the core plate is deformed.
Preferably, backing plate structure includes a plurality of backing plates that the interval set up about in the direction, all is equipped with first screw on every backing plate, all wears to be equipped with a backing plate on every high strength bolt and the SMA bolt.
Preferably, open grooves are formed in the left end and the right end of the constraint cover plate, the open grooves are of a strip-shaped groove structure which is through from top to bottom, the left end of the open groove in the left side is open, and the right end of the open groove in the right side is open;
the upper side and the lower side of the left end and the right end of the core plate are both vertically and fixedly provided with ribbed plates, one end of each ribbed plate, far away from the constraint cover plate, is flush with the end part of the adjacent core plate, and the ribbed plates are inserted in the open slots.
Preferably, the high-strength bolts are arranged in the second threaded holes of the constraint cover plate in the area corresponding to the left length and the right length of the open groove in a penetrating mode.
Preferably, the left end and the right end of the constraint cover plate are both provided with an open slot, and the constraint cover plate is symmetrical in front and back around the open slots; the core plate and the ribbed plates at the end parts of the core plate are in a cross structure which is symmetrical front and back.
Preferably, the rib plate is in a right-angle trapezoidal plate structure, and the inclined surface of the rib plate is positioned on one side of the opening far away from the open slot.
Preferably, the left side and the right side of the core plate are both provided with loading plates, the loading plates are of horizontally inverted T-shaped plate structures, and the end parts of the core plate and the rib plate are fixedly connected with a vertical plate structure of the loading plates.
The invention has the advantages that: when the inner core component is pressed to generate transverse deformation in the left and right directions, the constraint cover plate and the SMA bolt provide certain flexible constraint for the inner core component (the SMA bolt provides smaller transverse constraint rigidity and larger superelasticity recoverable deformation range, so that the inner core component can still continue to generate transverse deformation, and meanwhile, compared with the traditional assembly mode of completely fastening and connecting by using a high-strength bolt, the invention adopts the SMA bolt to replace a part of high-strength bolt at a stress node, so that the thickness of the cushion plate is reduced, and the time node of the deformation state transition of the inner core component from the state of single-point contact to double-point contact is earlier), so that when the transverse deformation of the inner core component reaches a certain degree (compared with the traditional BRB at the same time node), the contact area between the inner core component and the constraint cover plate is larger, The local extrusion stress of the constraint cover plate is smaller, so that the stress performance of the constraint component is optimized, the local bulging damage of the constraint component is prevented, and the stability and the anti-seismic performance of the assembled BRB are improved.
According to the invention, the SMA bolts are used as the high-strength bolts at a part of stress nodes, so that the thickness of the cushion block is reduced, the inner core can be in contact with the constraint cover plate in advance to generate flexible deformation when deforming, multipoint contact is formed as soon as possible, the overlong time of stress concentration on the constraint cover plate is avoided, and a large amount of energy formed when the core plate applies force to the constraint cover plate is dissipated more quickly. After the deformation of the core component reaches the peak (the high-strength bolt starts to play a role), the elastic restoring strain reaction force of the SMA bolt can be used to restore the initial state of the restraining cover plate after the external force action is lost. Compared with the common BRB, the invention can reduce the thickness of the restraining cover plate when bearing the same load, thereby reducing the steel consumption of the BRB and achieving the purposes of saving energy, reducing material and reducing weight.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic structural view of a front view angle in embodiment 1;
FIG. 2 is a schematic top view of the structure of FIG. 1;
FIG. 3 is a schematic perspective view of FIG. 1;
FIG. 4 is a schematic structural view from a front perspective of the peripheral constraining member and the inner core member of FIG. 1;
FIG. 5 is a schematic left-side view of the structure of FIG. 4;
FIG. 6 is a schematic perspective view of FIG. 4;
FIG. 7 is a perspective view of the peripheral restraining member of FIG. 6;
FIG. 8 is a schematic structural view of the inner core member and the shim plate of FIG. 6;
FIG. 9 is a schematic structural view of the core member of FIG. 8;
FIG. 10 is a schematic view showing the process of force deformation of the core member between the peripheral constraining members according to example 1;
FIG. 11 is a schematic representation of the process of forced deformation of the core member between the peripheral constraining members before modification (left series a) and after modification (right series b);
in the figure, the bearing plate comprises a core plate 1, a core plate 2, a rib plate 3, a base plate 301, a first screw hole 4, a positioning column 5, a constraint cover plate 501, a second screw hole 502, an open groove 503, a positioning hole 6, a high-strength bolt 7, an SMA bolt 8 and a loading plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
Example 1: a flexible constraint type fabricated anti-bending support structure based on SMA bolts is shown in figures 4, 5 and 6 and comprises a peripheral constraint component and an inner core component.
As shown in fig. 9, the core member includes a core plate 1 extending in the left-right direction, and rib plates 2 are perpendicularly welded to upper and lower sides of left and right ends of the core plate 1, and the rib plates 2 are used to enhance the structural strength of the end portions of the core plate 1.
One end of the ribbed slab 2 far away from the constraint cover plate 5 is flush with the end part of the adjacent core plate 1, and the end part of the core plate 1 and the ribbed slabs 2 on the upper side and the lower side of the core plate 1 are in a front-back symmetrical cross structure. In order to more easily introduce the force on rib 2 into core 1 when the force is applied to the ends of core 1 and rib 2, rib 2 has a right-angled trapezoidal plate structure, as shown in fig. 9, with the inclined surface of rib 2 on the side away from the opening of open groove 5.
The peripheral restraining member comprises two restraining cover plates 5 extending in the left-right direction, as shown in fig. 4, 5 and 6, the two restraining cover plates 5 are respectively arranged at the upper side and the lower side of the core plate 1, and the left-right length of the restraining cover plates 5 is smaller than that of the core plate 1 so that the left end and the right end of the core plate 1 can extend to the outside of the restraining cover plates 5, so that the end part of the core plate 1 can be conveniently connected with the force application member during experiment, construction and assembly.
As shown in fig. 4, 5 and 6, the constraining cover plate 5 is provided with two rows of second screw holes 501 arranged in the front-back direction at intervals and arranged in the left-right direction, and the high-strength bolts 6 and the SMA bolts 7 are alternately inserted into the second screw holes 501 arranged in the left-right direction one by one, the SMA bolts 7 in this embodiment are made of a nickel-titanium shape memory alloy, and of course, the SMA bolts 7 may also be made of other shape memory alloys with superelasticity and recoverable deformation characteristics.
In order to form a wave peak at the center of the core plate 1, the length of the core plate 1 after the multi-wave buckling deformation is symmetrical in the left-right direction, and the force application node of the wave peak of the core plate 1 after the multi-wave buckling deformation to the restraining cover plate 5 is located in the force application node area of the SMA bolt 7, therefore, in the present embodiment, the circle center connecting line of the two second screw holes 501 coincides with the left-right bisector of the restraining cover plate 5, and the SMA bolt 7 is inserted into the two second screw holes 501 located on the left-right bisector of the restraining cover plate 5.
In order to prevent the core plate 1 from translating left and right between the two constraining cover plates 5 when deformed, as shown in fig. 7, a through positioning hole 503 is provided at the diagonal intersection center of the constraining cover plates 5, and the positioning hole 503 is located on the left and right bisector of the constraining cover plates 5. Correspondingly, as shown in fig. 9, positioning columns 4 are vertically and fixedly arranged on the upper side and the lower side of the diagonal intersection center of the core plate 1, the positioning columns 4 are inserted into the positioning holes 503, and the positioning columns 4 are used for preventing the core plate 1 from translating left and right between the two constraint cover plates 5 when deformed, so that the middle wave crest of the core plate 1 when deformed always abuts against the force application areas of the two SMA bolts 7 on the left and right bisectors of the constraint cover plates 5.
An open slot 5 has all been seted up at both ends about restraint apron 5, and restraint apron 5 is around open slot 5 longitudinal symmetry. The open slot 5 is a strip-shaped slot structure which is through from top to bottom, the left end of the open slot 5 at the left side is open, the right end of the open slot 5 at the right end is open, and the ribbed plate 2 is inserted in the open slot 5. The structural design characteristics of the open slot 5 enable the restraint cover plate 5 to be conveniently installed and detached without interfering with the ribbed plates 2.
And, the inclined plane structural design of floor 2, can be when core 1 takes place to deform, floor 2's inclined plane can support the tank bottom of open slot 5 and conveniently carry out the side-to-side slip to floor 2 stops the interference to the left and right translation of core 1 tip. Meanwhile, the rib plates 2 are matched with the open grooves 5, so that the core plate 1 can be prevented from translating back and forth between the two constraint cover plates 5 when being deformed.
In order to avoid the SMA bolt 7 penetrating through the second screw holes 503 at the end portion, so that the end portion region of the core plate 1 located outside the constraining cover plate 5 is greatly deformed when being stressed, and further the end portion region of the core plate 1 located outside the constraining cover plate 5 is difficult to return to the initial state when being restored due to the absence of the reaction force of the SMA bolt 7, as shown in fig. 6, the high-strength bolts 6 penetrate through the second screw holes 503 located in the area corresponding to the left and right lengths of the open slot 5, that is, the high-strength bolts 6 at the end portion limit the deformation of the core plate 1 in the region.
The equal interval of left right direction is followed to both sides interval around core 1 and is equipped with the backing plate structure, and the backing plate structure leans on with core 1 towards one side of core 1 to be connected, and the thickness of backing plate structure is greater than the thickness of core 1 and provides initial deformation space for core 1.
As shown in fig. 6 and 8, in this embodiment, the backing plate structure includes a plurality of backing plates 3 arranged at intervals in the left-right direction, each backing plate 3 is provided with a first through screw hole 301, the first screw hole 301 corresponds to the second screw hole 501 up and down, the first screw hole 301 is used for passing through the high-strength bolt 6 and the SMA bolt 7, and each high-strength bolt 6 and the SMA bolt 7 is provided with one backing plate 3 in a penetrating manner.
The SMA bolt 7 passes through the second screw hole 501 and the first screw hole 301 to securely connect the restraining cover 5 and the shim plate 3.
The thickness of the shim plate 3 determines the length of time that the core plate 1 undergoes during the initial phase of deformation (the phase change of the state of the core plate 1 before the single-point contact with the constraining cover 5, as shown in the phase b1 in fig. 11) under the same stress conditions.
The length between the nut and the hexagonal screw head of the high-strength bolt 6 is greater than the sum of the thicknesses of the backing plate 3 and the two constraint cover plates 5, and the length between the nut and the hexagonal screw head of the high-strength bolt 6 is less than or equal to the maximum restorable elastic length of the SMA bolt 7.
The high-strength bolts 6 are used for limiting the maximum peak amplitude of the multi-wave buckling deformation of the core plate 1 between the restraining cover plates 5 in the up-down direction, and the high-strength bolts 6 are used for limiting the left-right length of a wave structure of the multi-wave buckling deformation of the core plate 1 between the restraining cover plates 5 in the left-right direction.
In order to facilitate force application in an experiment, as shown in fig. 1, 2 and 3, in the embodiment, the loading plates 8 are arranged on the left side and the right side of the core plate 1, the loading plates 8 are in a horizontally inverted T-shaped plate structure, and the end portions of the core plate 1 and the rib plate 2 are welded and connected with the vertical plate structure of the loading plate 8.
The working principle is as follows: when the inner core component is pressed to generate transverse deformation in the left and right directions, the constraint cover plate and the SMA bolt provide certain flexible constraint for the inner core component (the SMA bolt provides smaller transverse constraint rigidity and larger superelasticity recoverable deformation range, so that the inner core component can still continue to generate transverse deformation, and meanwhile, compared with the traditional assembly mode of completely fastening and connecting by using a high-strength bolt, the invention adopts the SMA bolt to replace a part of high-strength bolt at a stress node, so that the thickness of the cushion plate is reduced, and the time node of the deformation state transition of the inner core component from the state of single-point contact to the state of double-point contact is earlier), so that when the transverse deformation of the inner core component reaches a certain degree (compared with the traditional BRB at the same time node), the contact area between the inner core component and the constraint cover plate is larger, The local extrusion stress of the constraint cover plate is smaller, so that the stress performance of the constraint component is optimized, the local bulging damage of the constraint component is prevented, and the stability and the anti-seismic performance of the assembled BRB are improved.
According to the invention, a part of high-strength bolts are replaced by SMA bolts, so that the thickness of the cushion block is reduced, the core can be in contact with the constraint cover plate in advance to generate flexible deformation when deforming, multipoint contact is formed as soon as possible, the overlong time of stress concentration on the constraint cover plate is avoided, and a large amount of energy formed when the core plate applies force to the constraint cover plate is dissipated more quickly. After the deformation of the core component reaches the peak (the high-strength bolt starts to play a role), the elastic restoring strain reaction force of the SMA bolt can be used to restore the initial state of the restraining cover plate after the external force action is lost. Therefore, compared with the common BRB, the thickness of the restraining cover plate can be reduced when the same load is borne, so that the steel consumption of the BRB is reduced, and the aims of saving energy, reducing materials and reducing weight are fulfilled.
The invention breaks the working characteristic that the change of the distance between the upper and lower constraint cover plates is very small (the deformation is only in the steel elastic range) in the normal working process of the traditional assembled buckling restrained brace, as shown in fig. 11, wherein the flexible constraint type BRB of the invention refers to: firstly, the initial minimum distance between the constraint cover plates is controlled by the relatively thin cushion blocks 3 and the relatively short SMA bolts, so that the core component and the constraint cover plates can start to change from a single-point contact state to a multi-point contact state earlier, the phenomenon that the stress concentration on the constraint cover plates is too long is avoided, and a large amount of energy formed when the core plate applies force to the constraint cover plates is dissipated more quickly.
Secondly, taking the nickel-titanium shape memory alloy adopted by the SMA bolt in the name of the invention as an example, by utilizing the small rigidity (the elastic modulus of SMA is about 1/8 of steel (the material adopted by the high-strength bolt is steel)) and the large superelasticity restorable deformation (the superelasticity restorable strain of SMA material is up to 6% -8%, and the superelasticity restorable strain of the common high-strength bolt is less than 0.5%) of the SMA bolt, certain constraint rigidity and damping are provided for the compression transverse deformation process of the core member of the BRB when the single-point contact state is changed backwards (the state that b2 on the right side of fig. 11 is excessive to b 4), so that the generation and development processes of the single-point contact and the single-point contact to the double-point contact state between the core member and the peripheral constraint member are advanced.
Therefore, compared with the traditional assembled BRB, when the transverse deformation of the core component is larger, the high-strength bolt starts to generate the constraint action and generate the elastic deformation, and the distances between the upper constraint cover plate and the lower constraint cover plate of the two types of assembled BRBs are the same, the multipoint contact state of the core component is earlier, the multi-wave deformation development degree is wider, so that the contact area between the core component and the constraint cover plate is larger under the same time stress condition.
That is, under the condition that the maximum spacing of the high-strength bolt in the invention for limiting the two constraint cover plates is the same as the constraint spacing of the conventional BRB, the constraint cover plates in the invention are subjected to smaller local extrusion stress and are less prone to local buckling damage.
Therefore, the BRB construction mode of the invention improves the stability of the traditional BRB, and simultaneously provides a design space for properly reducing the section size (the thickness of the constraint cover plate and the cushion block) of the constraint system, thereby further reducing the dead weight of the BRB and being beneficial to the seismic performance and the cost control of the building structure.
And thirdly, controlling the critical constraint interval when the constraint system formally enters the working state by using a high-strength bolt which is longer than the SMA bolt. That is, as shown in fig. 11, when the core plate changes from the single-point contact state of b2 to the multi-wave buckling deformation state of b5, with further increase of the axial pressure of the high-strength bolt and the SMA bolt, the peripheral constraining member and the high-strength bolt together provide sufficient constraining rigidity to limit the peak amplitude of the compressive transverse deformation of the core member and the left-right length of a wave structure, so that the core member rapidly reaches the multi-wave buckling deformation state, and the force applying nodes of the core member to the constraining cover plate during the forming of the multi-wave buckling deformation state rapidly increase.
Example 2: in the embodiment, high-strength bolts 6 and SMA bolts 7 penetrate through second screw holes 501 in a left-right direction in a pairwise alternating manner. The other structure is the same as embodiment 1.
Example 3: the utility model provides a flexible restraint type assembled prevents crooked bearing structure based on SMA bolt, in this embodiment, restraint both ends all set up two open slots 5 that the interval set up around restricting the apron 5, and the upper and lower both sides at both ends all weld perpendicularly two ribbed slabs 2 that the interval set up around about the core 1, and ribbed slab 2 corresponds from top to bottom with open slot 5. The other structure is the same as embodiment 1.
Example 4: the utility model provides a flexible restraint type assembled anti-curvature bearing structure based on SMA bolt, in this embodiment, the backing plate structure is a strip shaped plate that leads to long, is equipped with a plurality of first screw 301 penetrating from top to bottom along left right direction interval on the strip shaped plate. The other structure is the same as embodiment 1.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (10)
1. The utility model provides a crooked bearing structure is prevented to flexible restraint type assembled based on SMA bolt which characterized in that: comprises a peripheral restraining component and a core component, wherein the core component comprises a core plate (1) extending along the left-right direction;
the peripheral restraining component comprises two restraining cover plates (5) extending along the left and right directions, the two restraining cover plates (5) are respectively arranged at the upper side and the lower side of the core plate (1), and the left and right length of the restraining cover plates (5) is smaller than that of the core plate (1) so that the left and right ends of the core plate (1) can extend to the outside of the restraining cover plates (5);
the constraint cover plate (5) is provided with two rows of second screw holes (501) which are arranged at intervals front and back and are arranged along the left-right direction, high-strength bolts (6) and SMA bolts (7) alternately penetrate through the second screw holes (501) arranged along the left-right direction, the SMA bolts (7) are made of shape memory alloy, and the high-strength bolts (6) penetrate through the second screw holes (501) at the left end and the right end;
the front side and the rear side of the core plate (1) are provided with backing plate structures at intervals along the left-right direction, one side of each backing plate structure, which faces the core plate (1), is connected with the core plate (1) in an abutting mode, and the thickness of each backing plate structure is larger than that of the core plate (1);
a plurality of vertically through first screw holes (301) are formed in the backing plate structure at intervals in the left-right direction, the first screw holes (301) vertically correspond to the second screw holes (501), the first screw holes (301) are used for allowing high-strength bolts (6) and SMA bolts (7) to penetrate, and the SMA bolts (7) penetrate through the second screw holes (501) and the first screw holes (301) so as to tightly connect the constraint cover plate (5) and the backing plate (3);
the length between the nut and the hexagonal screw head of the high-strength bolt (6) is greater than the sum of the thicknesses of the backing plate structure and the two constraint cover plates (5), and the length between the nut and the hexagonal screw head of the high-strength bolt (6) is less than or equal to the maximum restorable elastic length of the SMA bolt (7).
2. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 1, wherein: the high-strength bolts (6) and the SMA bolts (7) are alternately arranged in the second screw holes (501) in a one-to-one mode in the left-right direction.
3. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 2, wherein: the circle center connecting line of the two second screw holes (501) is superposed with the left and right bisectors of the constraint cover plate (5), and SMA bolts (7) are arranged in the two second screw holes (501) on the left and right bisectors of the constraint cover plate (5) in a penetrating manner.
4. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 3, wherein: a through positioning hole (503) is formed in the diagonal crossing center of the constraint cover plate (5), and the positioning hole (503) is located on the left and right bisectors of the constraint cover plate (5);
the upper side and the lower side of the diagonal intersection center of the core plate (1) are respectively and vertically fixedly provided with a positioning column (4), the positioning columns (4) are inserted into the positioning holes (503), and the positioning columns (4) are used for preventing the core plate (1) from translating left and right between the two constraint cover plates (5) when deformed.
5. A flexible restraining fabricated buckling-restrained support structure based on SMA bolts as in any one of claims 1-4, wherein: backing plate structure includes a plurality of backing plates (3) that the interval set up in the left right direction, all is equipped with first screw (301) on every backing plate (3), all wears to be equipped with one backing plate (3) on every high strength bolt (6) and SMA bolt (7).
6. A flexible restraining fabricated buckling-restrained support structure based on SMA bolts as in any one of claims 1-4, wherein: open grooves (5) are formed in the left end and the right end of the constraint cover plate (5), the open grooves (5) are of a strip-shaped groove structure which is through from top to bottom, the left end of the open groove (5) in the left side is open, and the right end of the open groove (5) in the right side is open;
the upper side and the lower side of the left end and the right end of the core plate (1) are both vertically fixedly provided with ribbed plates (2), one end of each ribbed plate (2), far away from the constraint cover plate (5), is flush with the end part of the adjacent core plate (1), and the ribbed plates (2) are inserted in the open grooves (5).
7. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 6, wherein: high-strength bolts (6) penetrate through second screw holes (503) in areas corresponding to the left length and the right length of the open groove (5) and located on the constraint cover plate (5).
8. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 7, wherein: the left end and the right end of the constraint cover plate (5) are both provided with an open slot (5), and the constraint cover plate (5) is symmetrical in front and back around the open slot (5); the core plate (1) and the ribbed plates (2) at the end parts thereof are in a cross structure which is symmetrical front and back.
9. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 8, wherein: the ribbed plate (2) is of a right-angle trapezoidal plate structure, and the inclined plane of the ribbed plate (2) is positioned on one side of the opening far away from the open slot (5).
10. The SMA bolt-based flexible restraint fabricated buckling restrained brace structure of claim 9, wherein: the left side and the right side of the core plate (1) are both provided with loading plates (8), the loading plates (8) are of horizontally inverted T-shaped plate structures, and the end parts of the core plate (1) and the rib plates (2) are fixedly connected with a vertical plate structure of the loading plates (8).
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| CN202210765785.6A CN115012547B (en) | 2022-07-01 | 2022-07-01 | Flexible constraint type assembled buckling restrained brace structure based on SMA bolt |
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| CN115012547B (en) | 2023-06-27 |
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