CN115012547B - 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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- CN115012547B CN115012547B CN202210765785.6A CN202210765785A CN115012547B CN 115012547 B CN115012547 B CN 115012547B CN 202210765785 A CN202210765785 A CN 202210765785A CN 115012547 B CN115012547 B CN 115012547B
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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
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Abstract
The invention provides a flexible constraint type assembled anti-curvature supporting structure based on an SMA bolt, which solves the problems that the material thickness of a core member and a constraint cover plate of a traditional assembled BRB is thicker, and meanwhile, the difficulty of self-recovery of the core member after deformation is larger and the recovery time is longer. According to the invention, the high-strength bolts at part of stress nodes are replaced by SMA bolts, so that the thickness of the backing plate is reduced, the core can be contacted with the constraint cover plate in advance to generate flexible deformation when the core is deformed, multi-point contact is formed as soon as possible, and the stress concentration time on the constraint cover plate is avoided to be too long. After the deformation of the inner core member reaches the vertex, after the external force is lost, the reaction force of the strain can be recovered by utilizing the super elasticity of the SMA bolt, so that the constraint cover plate is recovered to the initial state. Compared with the common BRB, the invention can reduce the thickness of the constraint cover plate when bearing the same load, thereby reducing the steel consumption of the BRB and achieving the purposes of energy conservation, material reduction and weight reduction.
Description
Technical Field
The invention relates to the technical field of buckling restrained braces, in particular to a flexible constraint type assembled buckling restrained brace structure based on an SMA bolt.
Background
The Buckling Restrained Brace (BRB) is mainly composed of an inner core member and a peripheral restraining system, wherein the inner core member bears axial force, and the peripheral system is utilized to restrain transverse displacement of the inner core member, so that the inner core member can generate full-section yielding under the action of axial compression, and the tensile-compression symmetrical stress performance is obtained. Under normal use and small shock, the BRB plays a supporting role of a common center support and provides lateral rigidity for the building structure; under the action of large earthquake, the BRB can repeatedly pull and press the hysteresis to dissipate the energy input by the earthquake. Fabricated buckling restrained braces have received increasing attention from the academia due to their ease of connection and lightweight, and have developed a variety of cross-sectional versions.
While the current fabricated BRB has been under relatively extensive research and application, it still has some design difficulties and space to optimize: the prior common assembly BRB adopts a backing plate and a steel high-strength bolt to assemble a peripheral constraint system and a core energy consumption component, and simultaneously controls the size of a gap between the constraint system and the core component by adjusting the height of the backing plate, thereby achieving the purposes of optimizing the local stress level of the constraint system, optimizing the compression deformation mode of the core component and the like. Studies have shown that: on one hand, the clearance between the inner core and the peripheral constraint system is properly increased, so that the inner core member is easier to generate multi-wave deformation, and the occurrence and development of the full-section plastic deformation of the yield section of the inner core member are facilitated; at the same time, however, the larger the gap, the greater the pressing force of the inner core against the peripheral member will be, and the peripheral member will be at a higher stress level, so that the cross-sectional area of the constraining member must be increased or stiffening ribs added to ensure sufficient constraining rigidity. On the other hand, the gap is reduced, so that the extrusion force of the inner core to the peripheral component can be effectively controlled, and the stress of the peripheral component is optimized; but the multi-wave deformation of the core yield section is limited, so that the hysteresis energy consumption of the BRB core is not facilitated, and the stress performance of the outer extending section of the BRB core is not facilitated, and the cross-sectional area of the outer extending section of the core is required to be increased or an additional rotation constraint component is required to be arranged on the outer extending section.
All pass through ordinary high strength bolted connection between the outside constraint apron of traditional assembled BRB and the kernel component, lead to the kernel component longer with constraint apron time before the contact, the deformation of kernel component is great, the multi-wave buckling deformation (the state of a5 and b5 that fig. 11 supplies specially) takes place later for the kernel component is long with the state duration of constraint apron with single-point contact, the local pressurized duration of single-point of constraint apron is longer, these factors are higher to the intensity requirement of kernel component and constraint apron, and then the backing plate that needs the preparation is thicker with the material thickness of constraint apron, be unfavorable for the saving of material cost, the degree of difficulty that also lead to the kernel component to recover by oneself after the deformation is great simultaneously, recovery time is longer.
Disclosure of Invention
In order to solve the problems of thicker material thickness of the inner core component and the constraint cover plate of the traditional assembled BRB and higher self-recovery difficulty and longer recovery time of the inner core component after deformation 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-right direction;
the peripheral constraint component comprises two constraint cover plates extending along the left-right direction, the two constraint cover plates are respectively arranged on the upper side and the lower side of the core plate, and the left-right length of the constraint 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 constraint cover plates;
the constraint cover plate is provided with two rows of second screw holes which are arranged at intervals in the front-back direction and are arranged along the left-right direction, high-strength bolts and SMA bolts are alternately penetrated in the second screw holes which are arranged along the left-right direction, the SMA bolts are made of shape memory alloy, and the high-strength bolts are penetrated in the second screw holes which are positioned at the left end and the right end;
the back and forth sides of the core plate are provided with pad structures at intervals along the left-right direction, one side of the pad structure facing the core plate is in abutting connection with the core plate, and the thickness of the pad structures 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 vertically penetrated are formed in the backing plate structure at intervals along the left-right direction, the first screw holes correspond to the second screw holes vertically, the first screw holes are used for allowing 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 tightly connect the constraint cover plate and the backing plate;
the length between the nut of the high strength bolt and the hexagonal screw head is greater than the sum of the thicknesses between the backing plate structure and the two restraining cover plates, and the length between the nut of the high strength bolt and the hexagonal screw head is less than or equal to the maximum recoverable deformation elastic length of the SMA bolt.
Preferably, the high-strength bolts and the SMA bolts are alternately arranged in the second screw holes in a penetrating mode in the left-right direction.
Preferably, the connecting line of the circle centers of the two second screw holes coincides with the left bisector and the right bisector of the constraint cover plate, and the two second screw holes positioned on the left bisector and the right bisector of the constraint cover plate are respectively penetrated with an SMA bolt.
Preferably, the diagonal crossing center of the constraint cover plate is provided with a positioning hole which is penetrated up and down, and the positioning hole is positioned on the left and right bisectors of the constraint cover plate;
the upper side and the lower side of the diagonal crossing center of the core plate are vertically and fixedly provided with positioning columns which are inserted in the positioning holes and used for preventing the core plate from translating left and right between the two constraint cover plates when the core plate deforms.
Preferably, the backing plate structure comprises a plurality of backing plates which are arranged at intervals in the left-right direction, each backing plate is provided with a first screw hole, and each high-strength bolt and each SMA bolt are respectively provided with a backing plate in a penetrating mode.
Preferably, the left end and the right end of the constraint cover plate are both provided with open slots, the open slots are in a strip-shaped slot structure penetrating up and down, the left end of the open slot on the left side is open, and the right end of the open slot on the right end is open;
the upper side and the lower side of the left end and the right end of the core plate are vertically and fixedly provided with rib plates, one end of each rib plate, which is far away from the constraint cover plate, is flush with the end of the adjacent core plate, and the rib plates are inserted into the open grooves.
Preferably, the high-strength bolts are respectively penetrated in the second screw holes positioned in the area corresponding to the left and right lengths of the constraint cover plate along the open slot.
Preferably, the left end and the right end of the constraint cover plate are respectively provided with an open slot, and the constraint cover plate is symmetrical to the open slots in front and back; the core plate and the rib plates at the end parts of the core plate are in a crisscross structure which is symmetrical in front-back.
Preferably, the rib plate is of a right-angle trapezoid plate structure, and the inclined plane of the rib plate is located at one side far away from the opening of 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 a T-shaped plate structure which is horizontally inverted, and the end parts of the core plate and the rib plates are fixedly connected with the vertical plate structure of the loading plates at the same time.
The invention has the advantages that: according to the invention, when the inner core member is pressed to generate smaller transverse deformation amplitude in the left-right direction, the constraint cover plate and the SMA bolt provide certain flexible constraint (the SMA bolt provides smaller transverse constraint rigidity and larger superelastic restorable deformation range, so that the inner core member can still continuously generate transverse deformation, meanwhile, compared with the traditional assembly mode of fastening and connecting the base plate and the constraint cover plate by adopting the high-strength bolts, the thickness of the base plate is reduced by adopting the SMA bolt to replace a part of high-strength bolts at the stressed nodes, so that the time node of the deformation state of the inner core member from single-point contact to double-point contact is earlier, and when the transverse deformation of the inner core member reaches a certain degree (compared with the time node of the traditional BRB), the contact area between the inner core member 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 member is optimized, the occurrence of local bulging and damage of the constraint member is prevented, and the stability and the shock resistance of the assembled BRB are improved.
According to the invention, the high-strength bolts at part of stress nodes are replaced by SMA bolts, so that the thickness of the backing plate is reduced, the core can be contacted with the constraint cover plate in advance to generate flexible deformation when deforming, multi-point contact is formed as early 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 inner core member reaches the vertex (the high-strength bolt starts to act), the reaction force of the super-elasticity recoverable strain of the SMA bolt can be utilized after the external force is lost, so that the constraint cover plate is recovered to the initial state. Compared with the common BRB, the invention can reduce the thickness of the constraint cover plate when bearing the same load, thereby reducing the steel consumption of the BRB and achieving the purposes of energy conservation, material reduction and weight reduction.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic view of the structure of the front view angle of embodiment 1;
FIG. 2 is a schematic view of the structure of FIG. 1 from a top view;
FIG. 3 is a schematic perspective view of FIG. 1;
FIG. 4 is a schematic view of the peripheral restraining member and the core member of FIG. 1 from a front view angle;
FIG. 5 is a schematic view of the structure at the left-hand angle of FIG. 4;
FIG. 6 is a schematic perspective view of FIG. 4;
FIG. 7 is a schematic perspective view of the peripheral restraining member of FIG. 6;
FIG. 8 is a schematic view of the core member and 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 deformation of the core member between the peripheral constraint members in example 1;
FIG. 11 is a schematic illustration of the process of forced deformation of the core member between the peripheral restraining members before modification (left series a) and after modification (right series b);
in the figure, 1, a core plate, 2, rib plates, 3, a backing plate, 301, a first screw hole, 4, a positioning column, 5, a constraint cover plate, 501, a second screw hole, 502, an open slot, 503, a positioning hole, 6, a high-strength bolt, 7, an SMA bolt, 8 and a loading plate.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without any inventive effort, are intended to be within the scope of the invention.
Example 1: a flexible constraint type assembled anti-curvature supporting structure based on SMA bolts, as shown in figures 4, 5 and 6, 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, rib plates 2 are vertically welded to both upper and lower sides of left and right ends of the core plate 1, and the rib plates 2 are used for reinforcing structural strength of the end portions of the core plate 1.
One end of the rib plate 2 far away from the constraint cover plate 5 is flush with the end of the adjacent core plate 1, and the end of the core plate 1 and the rib plates 2 on the upper side and the lower side of the core plate are in a cross structure which is symmetrical in front-back. In order that the force on the rib 2 is more easily introduced into the core plate 1 when the force is applied to the core plate 1 and the end portions of the rib 2, as shown in fig. 9, the rib 2 has a right-angled trapezoidal plate structure, and the inclined surface of the rib 2 is located on the side away from the opening of the open groove 502.
The peripheral constraint member includes two constraint cover plates 5 extending in the left-right direction, as shown in fig. 4, 5 and 6, the two constraint cover plates 5 are respectively provided at the upper and lower sides of the core plate 1, and the left-right length of the constraint cover plates 5 is smaller than the left-right length of the core plate 1 so that both the left and right ends of the core plate 1 can extend to the outside of the constraint cover plates 5, so that the end of the core plate 1 can be conveniently connected with the force application member during the experimental and construction assembly.
As shown in fig. 4, 5 and 6, the constraint cover 5 is provided with two rows of second screw holes 501 which are arranged at intervals in the front-back direction and are arranged along the left-right direction, and the high-strength bolts 6 and the SMA bolts 7 are alternately arranged in the second screw holes 501 arranged along the left-right direction, and the SMA bolts 7 in the embodiment are made of nickel-titanium shape memory alloy, and of course, the SMA bolts 7 can also be made of other shape memory alloys with super-elastic restorable deformation characteristics.
In order to form a peak at the center of the core plate 1, so that the length of the core plate 1 in the left-right direction after the multi-wave buckling deformation is symmetrical, and the point of application of the peak of the core plate 1 to the constraint cover plate 5 after the multi-wave buckling deformation is located in the area of the point of application of force to the SMA bolt 7, in this embodiment, the connecting line of the centers of the two second screw holes 501 coincides with the left-right bisectors of the constraint cover plate 5, and the SMA bolt 7 is inserted into the two second screw holes 501 located on the left-right bisectors of the constraint cover plate 5.
In order to prevent the core plate 1 from translating left and right between the two constraint cover plates 5 when deformed, as shown in fig. 7, a positioning hole 503 penetrating up and down is arranged at the crossing center of the diagonal lines of the constraint cover plates 5, and the positioning hole 503 is positioned on the left and right bisectors of the constraint cover plates 5. Correspondingly, as shown in fig. 9, the upper and lower sides at the diagonal crossing center of the core plate 1 are vertically and fixedly provided with positioning posts 4, the positioning posts 4 are inserted into the positioning holes 503, and the positioning posts 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 crest of the core plate 1 when deformed always abuts against the force application areas of the two SMA bolts 7 located on the left and right bisectors of the constraint cover plates 5.
The left end and the right end of the constraint cover plate 5 are respectively provided with an open slot 502, and the constraint cover plate 5 is symmetrical to the open slot 502 in the front-back direction. The open slot 502 is a strip-shaped slot structure penetrating from top to bottom, the left end of the open slot 502 on the left side is opened, the right end of the open slot 502 on the right end is opened, and the rib plate 2 is inserted in the open slot 502. The structural design features of the open slot 502 allow the constraint cover plate 5 to be easily installed and removed without interference from the rib plate 2.
Moreover, due to the design of the inclined surface structure of the rib plate 2, when the core plate 1 is deformed, the inclined surface of the rib plate 2 can conveniently slide left and right against the bottom of the open groove 502, so that the rib plate 2 is prevented from blocking interference to the left and right translation of the end part of the core plate 1. At the same time, the rib 2 and the open groove 502 cooperate to prevent the core plate 1 from translating back and forth between the two constraint cover plates 5 during deformation.
In order to avoid the SMA bolt 7 penetrating the second screw hole 501 at the end, the end region of the core plate 1 located outside the constraint cover plate 5 is simultaneously deformed greatly when being stressed, so that the end region of the core plate 1 located outside the constraint cover plate 5 is difficult to recover to the initial state when recovering due to the reaction force of the SMA bolt 7, as shown in fig. 6, the high-strength bolts 6 are penetrating the second screw holes 501 located in the area corresponding to the left and right length of the open slot 502 of the constraint cover plate 5, that is, the deformation of the core plate 1 by the high-strength bolts 6 located at the end is limited in this region.
The space between the front side and the rear side of the core plate 1 is provided with a cushion plate structure at intervals along the left-right direction, one side of the cushion plate structure facing the core plate 1 is in abutting connection with the core plate 1, and the thickness of the cushion plate structure is larger than that of the core plate 1 so as to provide an initial deformation space for the core plate 1.
As shown in fig. 6 and 8, in this embodiment, the pad structure includes a plurality of pads 3 disposed at intervals in the left-right direction, each pad 3 is provided with a first screw hole 301 penetrating from top to bottom, the first screw hole 301 corresponds to the second screw hole 501 from top to bottom, the first screw hole 301 is used for passing through the high strength bolt 6 and the SMA bolt 7, and each of the high strength bolt 6 and the SMA bolt 7 is provided with one pad 3.
The thickness of the backing plate 3 determines the length of time that the core plate 1 undergoes during the initial phase of deformation (phase b1 in fig. 11) under the same stress conditions, before the core plate 1 comes into single-point contact with the constraint cover plate 5.
The length between the nut of the high-strength bolt 6 and the head of the hexagonal screw is greater than the sum of the thicknesses between the backing plate 3 and the two restraining cover plates 5, and the length between the nut of the high-strength bolt 6 and the head of the hexagonal screw is less than or equal to the maximum recoverable deformation elastic length of the SMA bolt 7.
The high-strength bolts 6 are used in the up-down direction to limit the maximum peak amplitude of the multi-wave buckling deformation of the core plate 1 between the constraint cover plates 5, and the high-strength bolts 6 are used in the left-right direction to limit the left-right length of one wave structure of the multi-wave buckling deformation of the core plate 1 between the constraint cover plates 5.
In order to facilitate the application of force during experiments, as shown in fig. 1, 2 and 3, in this embodiment, loading plates 8 are disposed on both the left and right sides of the core plate 1, the loading plates 8 are in a horizontally inverted T-shaped plate structure, and the ends of the core plate 1 and the rib plates 2 are simultaneously welded with the riser structure of the loading plates 8.
Working principle: according to the invention, when the inner core member is pressed to generate smaller transverse deformation amplitude in the left-right direction, the constraint cover plate and the SMA bolt provide certain flexible constraint (the SMA bolt provides smaller transverse constraint rigidity and larger superelastic restorable deformation range, so that the inner core member can still continuously generate transverse deformation, meanwhile, compared with the traditional assembly mode of fastening and connecting the base plate and the constraint cover plate by adopting the high-strength bolts, the thickness of the base plate is reduced by adopting the SMA bolt to replace a part of the high-strength bolts at the stressed nodes, so that the time node of the transition of the deformation state of the inner core member from the state of single-point contact to the state of double-point contact is earlier, and therefore, when the transverse deformation of the inner core member reaches a certain degree (compared with the time node of the traditional BRB), the contact area between the inner core member 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 member is optimized, the occurrence of local bulging and damage of the constraint member is prevented, and the stability and shock resistance of the assembled BRB are improved.
According to the invention, by replacing a part of high-strength bolts into SMA bolts, the thickness of the backing plate is reduced, so that the core can be contacted with the constraint cover plate in advance to generate flexible deformation when deforming, multi-point contact is formed as early 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 inner core member reaches the vertex (the high-strength bolt starts to act), the reaction force of the super-elasticity recoverable strain of the SMA bolt can be utilized after the external force is lost, so that the constraint cover plate is recovered to the initial state. Compared with the common BRB, the invention can reduce the thickness of the constraint cover plate when bearing the same load, thereby reducing the steel consumption of the BRB and achieving the purposes of energy conservation, material reduction and weight reduction.
The invention breaks through the working characteristics that the distance between the upper constraint cover plate and the lower constraint cover plate of the traditional assembled buckling restrained brace is very small in change (only deforms in the elastic range of steel) in the normal working process, as shown in fig. 11, wherein the flexible constraint BRB of the invention refers to: (1) the initial minimum distance between the constraint cover plates is controlled by the relatively thinner backing plates 3 and the relatively shorter SMA bolts, so that the inner core member and the constraint cover plates can start to change from single-point contact to multi-point contact state earlier, the overlong time of stress concentration on the constraint cover plates is avoided, and a large amount of energy formed when the core plates exert force on the constraint cover plates is dissipated more quickly.
(2) Taking the nickel-titanium shape memory alloy adopted by the SMA bolt in the name of the invention as an example, the smaller rigidity (the elastic modulus of the SMA is about 1/8 of that of steel (the material adopted by the high-strength bolt is steel)) and the larger super-elasticity restorable deformation (the super-elasticity restorable strain of the SMA material is as high as 6% -8%, and the super-elasticity restorable strain of the common high-strength bolt is smaller than 0.5%) of the SMA bolt are utilized to provide certain constraint rigidity and damping for the compression transverse deformation process of the inner core member of the BRB when the single-point contact state is changed backwards (the state that b2 to b4 on the right side of the figure 11 is excessive), so that the single-point contact between the inner core member and the peripheral constraint member and the occurrence and development process of the single-point contact to the double-point contact state are advanced.
Compared with the traditional assembly type BRB, when the transverse deformation of the inner core component is larger, the high-strength bolts start to generate the constraint function to generate elastic deformation, and the distances between the upper constraint cover plates and the lower constraint cover plates of the two assembly type BRB are the same, the multi-point contact state of the inner core component is earlier, the multi-wave deformation development degree is wider, and the contact area between the inner core component and the constraint cover plates is larger under the condition of stress at the same time.
Namely, when the maximum spacing limited by the high-strength bolts on the two constraint cover plates is the same as the constraint spacing of the traditional BRB, the constraint cover plates are subjected to smaller local extrusion stress, and local bulging damage is less likely to occur.
Therefore, the BRB construction mode of the invention not only improves the stability of the traditional BRB, but also gives a design space for properly reducing the section size (the thickness of the constraint cover plate and the thickness of the base plate) of the constraint system, thereby further reducing the dead weight of the BRB and being beneficial to the earthquake resistance and the cost control of the building structure.
(3) In the invention, the critical constraint distance when the constraint system formally enters the working state is controlled by a high-strength bolt which is longer than the SMA bolt. That is, as shown in fig. 11, when the core plate is changed 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 bolts and the SMA bolts, sufficient constraint rigidity is provided by the peripheral constraint member and the high-strength bolts together to limit the peak amplitude of the compressive transverse deformation of the core member and the left and right lengths of one wave structure, so that the core member rapidly reaches the multi-wave buckling deformation state, and the force application node of the core member to the constraint cover plate during formation of the multi-wave buckling deformation state is rapidly increased.
Example 2: in this embodiment, the high-strength bolts 6 and the SMA bolts 7 are alternately inserted into the second screw holes 501 in the left-right direction. Other structures are the same as those of embodiment 1.
Example 3: in this embodiment, two open slots 502 which are arranged at intervals are respectively formed in the left end and the right end of the constraint cover plate 5, two rib plates 2 which are arranged at intervals are respectively welded vertically on the upper side and the lower side of the left end and the right end of the core plate 1, and the rib plates 2 correspond to the open slots 502 vertically. Other structures are the same as those of embodiment 1.
Example 4: in this embodiment, the backing plate structure is a strip-shaped plate with a through length, and a plurality of first screw holes 301 penetrating up and down are arranged on the strip-shaped plate along the left-right direction at intervals. Other structures are the same as those of 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 characteristics 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. Flexible constraint type assembled anti-curvature supporting structure based on SMA bolt, its characterized in that: comprises a peripheral constraint component and a core component, wherein the core component comprises a core board (1) extending along the left-right direction;
the peripheral constraint component comprises two constraint cover plates (5) extending along the left-right direction, the two constraint cover plates (5) are respectively arranged on the upper side and the lower side of the core plate (1), and the left-right length of the constraint cover plates (5) is smaller than the left-right length 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 constraint cover plates (5);
the constraint cover plate (5) is provided with two rows of second screw holes (501) which are arranged at intervals in the front-back direction and are arranged along the left-right direction, high-strength bolts (6) and SMA bolts (7) are alternately arranged in 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) are respectively arranged in the second screw holes (501) at the left end and the right end in a penetrating way;
the space between the front side and the rear side of the core plate (1) is provided with a cushion plate structure at intervals along the left-right direction, one side of the cushion plate structure facing the core plate (1) is in abutting connection with the core plate (1), and the thickness of the cushion plate structure is larger than that of the core plate (1);
a plurality of first screw holes (301) which are vertically penetrated are arranged on the backing plate structure at intervals along the left-right direction, the first screw holes (301) are vertically corresponding to the second screw holes (501), the first screw holes (301) are used for allowing high-strength bolts (6) and SMA bolts (7) to pass through, and the SMA bolts (7) pass through the second screw holes (501) and the first screw holes (301) so as to tightly connect the constraint cover plate (5) with the backing plate (3);
the length between the nut of the high-strength bolt (6) and the hexagonal screw head is greater than the sum of the thicknesses between the backing plate structure and the two restraining cover plates (5), and the length between the nut of the high-strength bolt (6) and the hexagonal screw head is less than or equal to the maximum recoverable deformation elastic length of the SMA bolt (7).
2. A flexible constraint fabricated camber-resistant support structure based on SMA bolts as claimed in claim 1, wherein: the high-strength bolts (6) and the SMA bolts (7) are alternately arranged in the second screw holes (501) in a penetrating mode in the left-right direction.
3. A flexible constraint fabricated camber-resistant support structure based on SMA bolts as claimed in claim 2, wherein: the circle center connecting line of the two second screw holes (501) coincides with the left and right bisectors of the constraint cover plate (5), and SMA bolts (7) are respectively arranged in the two second screw holes (501) on the left and right bisectors of the constraint cover plate (5) in a penetrating mode.
4. A SMA bolt-based flexible constraint fabricated camber-resistant support structure according to claim 3, wherein: the diagonal crossing center of the constraint cover plate (5) is provided with a positioning hole (503) which is penetrated up and down, and the positioning hole (503) is positioned on the left and right bisectors of the constraint cover plate (5);
the upper side and the lower side of the diagonal crossing center of the core plate (1) are vertically and fixedly provided with positioning columns (4), the positioning columns (4) are inserted into the positioning holes (503), and the positioning columns (4) are used for preventing left-right translation between the two constraint cover plates (5) when the core plate (1) is deformed.
5. A SMA bolt-based flexible restraint assembled anti-curvature support structure according to any one of claims 1 to 4, wherein: the backing plate structure comprises a plurality of backing plates (3) which are arranged at intervals in the left-right direction, each backing plate (3) is provided with a first screw hole (301), and each high-strength bolt (6) and each SMA bolt (7) are respectively provided with one backing plate (3) in a penetrating mode.
6. A SMA bolt-based flexible restraint assembled anti-curvature support structure according to any one of claims 1 to 4, wherein: the left end and the right end of the constraint cover plate (5) are respectively provided with an open slot (502), the open slot (502) is of a strip-shaped slot structure which is transparent up and down, the left end of the open slot (502) on the left side is open, and the right end of the open slot (502) on the right end is open;
the upper side and the lower side of the left end and the right end of the core plate (1) are vertically and fixedly provided with rib plates (2), one end, away from the constraint cover plate (5), of the rib plates (2) is flush with the end of the adjacent core plate (1), and the rib plates (2) are inserted into the open grooves (502).
7. The SMA bolt-based flexible constraint type fabricated camber-preventing support structure of claim 6, wherein: the second screw holes (501) located in the area corresponding to the left and right lengths of the constraint cover plate (5) along the open slot (502) are respectively penetrated with high-strength bolts (6).
8. A SMA bolt-based flexible constraint fabricated camber-resistant support structure according to claim 7, wherein: the left end and the right end of the constraint cover plate (5) are respectively provided with an open slot (502), and the constraint cover plate (5) is symmetrical to the open slots (502) in front and back; the core plate (1) and the rib plates (2) at the end parts thereof are in a crisscross structure which is symmetrical from front to back.
9. The SMA bolt-based flexible constraint type fabricated camber-preventing support structure of claim 8, wherein: the rib plate (2) is of a right trapezoid plate structure, and the inclined plane of the rib plate (2) is located at one side far away from the opening of the open slot (502).
10. A SMA bolt-based flexible constraint type fabricated camber-preventing support structure according to 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 a T-shaped plate structure which is horizontally inverted, and the end parts of the core plate (1) and the rib plates (2) are fixedly connected with the vertical plate structure of the loading plates (8) at the same time.
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| Application Number | Priority Date | Filing Date | Title |
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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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| 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 true CN115012547B (en) | 2023-06-27 |
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| JP3554755B2 (en) * | 1995-06-14 | 2004-08-18 | 三井住友建設株式会社 | How to install the vibration control device |
| JP4197460B2 (en) * | 2002-09-12 | 2008-12-17 | 新日本製鐵株式会社 | Fireproof coated high strength bolt joint structure |
| JP4695417B2 (en) * | 2005-03-16 | 2011-06-08 | 新日本製鐵株式会社 | Rail joint member using shape memory alloy |
| EP2578707A4 (en) * | 2010-05-31 | 2013-12-25 | Japan Copper Dev Ass | Copper-based alloy and structural material comprising same |
| CN103711220B (en) * | 2013-12-30 | 2015-10-28 | 北京工业大学 | A kind of Novel bolt assembling rectangular steel tube in-line variable-cross-sectisteel steel core anti-buckling energy-consumption limited support component |
| CN105952018A (en) * | 2016-07-12 | 2016-09-21 | 上海天华建筑设计有限公司 | Multi-point yield energy dissipating type mild steel energy dissipater |
| CN106593060A (en) * | 2017-02-06 | 2017-04-26 | 同济大学 | Novel buckling energy consumption support |
| CN108060727B (en) * | 2018-02-05 | 2021-04-16 | 沈阳建筑大学 | Double-aluminum alloy plate assembled buckling restrained brace |
| CN109853767A (en) * | 2019-02-28 | 2019-06-07 | 南昌大学 | A kind of Self-resetting support device based on marmem and low friction gasket |
| CN110219369B (en) * | 2019-07-10 | 2024-04-26 | 重庆大学 | Buckling restrained beam column self-resetting node based on steel-SMA plate group element and assembling method |
| CN111502056B (en) * | 2020-03-23 | 2021-03-23 | 北京交通大学 | Deformation self-recoverable assembled buckling restrained brace |
| CN113833147B (en) * | 2021-10-13 | 2022-10-11 | 黑龙江科技大学 | Multistage replaceable self-resetting buckling-restrained brace device |
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