CN108930346B - Self-resetting swinging wall containing buckling restrained shape memory alloy bars and building - Google Patents

Self-resetting swinging wall containing buckling restrained shape memory alloy bars and building Download PDF

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Publication number
CN108930346B
CN108930346B CN201810928018.6A CN201810928018A CN108930346B CN 108930346 B CN108930346 B CN 108930346B CN 201810928018 A CN201810928018 A CN 201810928018A CN 108930346 B CN108930346 B CN 108930346B
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shape memory
memory alloy
swinging
alloy rod
self
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CN108930346A (en
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邱灿星
张邑尘
齐健
陈城
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Shandong University
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Shandong University
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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2/00Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04HBUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
    • E04H9/00Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate
    • E04H9/02Buildings, or groups of buildings, or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake, extreme climate withstanding earthquake or sinking of ground

Abstract

The invention discloses a self-resetting swinging wall based on buckling restrained shape memory alloy bars, wherein a swinging wall body is connected with a foundation beam through a wall body connecting and tying body connecting system, the wall body connecting system ensures that the wall body is directly hinged with the foundation beam, and a sufficient rotating space is reserved for the swinging wall body; the alloy rod is arranged between the swinging wall and the foundation beam, the bottom of the alloy rod is connected with the foundation beam through an anchoring device, and the top of the alloy rod is connected with the swinging wall through a pre-buried sleeve; the restraining sleeve is arranged on the periphery of the shape memory alloy rod and wraps the shape memory alloy rod; the main body frames or the walls are arranged on two sides of the swinging wall body and are connected through a plurality of groups of inter-wall-body dampers, and the inter-wall-body dampers can increase the energy dissipation capacity of the swinging wall; when the dampers between the walls do not have self-resetting performance, the shape memory alloy rod applies pretightening force in a mode of over-screwing threads so as to overcome the resetting resistance of the dampers.

Description

Self-resetting swinging wall containing buckling restrained shape memory alloy bars and building
Technical Field
The invention relates to the field of building steel structures, in particular to a self-resetting swinging wall containing buckling restrained shape memory alloy bars and a steel structure building comprising the self-resetting swinging wall.
Background
The building earthquake-resistant design goes through rigid design, flexible design, ductility design and other stages. Due to the ductile design, the anti-seismic construction cost of the structure can be reduced, and the anti-seismic performance of the building is improved to a certain extent, so that the anti-seismic structure is widely applied. However, the ductile design usually means that the damage of the structure is increased, and the earthquake damage mode of the structure is not convenient to control, so that the repair cost and the repair difficulty of the earthquake-caused building are greatly increased. Early studies showed that properly loosening the connection of the members to the foundation, allowing a building to swing a certain length under the action of an earthquake, effectively reduced the earthquake damage to the structure. The concept of a rocking wall therefore arose. The side direction deformation mode of structure can be controlled on the one hand to the wall that sways, and on the other hand consumes seismic energy through the energy dissipation attenuator between wall body and the basis and wall body. The traditional swinging wall generally applied to engineering structures at present mainly comprises a wall body with high rigidity and an energy dissipation damper. Although the swing wall has good energy dissipation capacity, the swing wall and buildings thereof can leave large residual deformation after earthquake, so that the swing wall is difficult to repair, has high repair cost and can only be dismantled and rebuilt. The self-resetting swinging wall is additionally provided with the self-resetting unit in the traditional swinging wall, so that the self-resetting after the vibration of the swinging wall can be realized, convenience is brought to the restoration of the structure after the vibration, and the restoration cost is greatly reduced. The self-resetting swinging wall proposed at present mainly comprises a prestressed self-resetting swinging wall and a shape memory alloy self-resetting swinging wall. The prestressed self-reset swinging wall consumes seismic energy through energy consumption elements and realizes self-reset through the pretension of prestressed tendons. The construction and construction process of the prestressed self-resetting swinging wall are complex, the nominal yield stiffness is high, and the allowable deformation is limited. Under the influence of reciprocating loading under the action of earthquake, the pre-tension ribs can also be loosened, so that the swinging wall loses the initial rigidity when undergoing small deformation. The shape memory alloy self-resetting swinging wall realizes energy consumption and self-resetting performance through the superelasticity of the shape memory alloy material. The existing shape memory alloy self-resetting swinging wall adopts shape memory alloy wires and rods or bolts, but the shape memory alloy self-resetting swinging wall is based on that the shape memory alloy materials are only pulled. This means that the shape memory alloy components of this type of self-resetting swinging wall are in a non-working state when compressed, and particularly for the shape memory alloy components using rods and screws, the shape memory alloy components are easy to bend and break when compressed. When a large shock occurs, the peak value of the shape memory alloy component is deformed too much and enters a strengthening stage, the component generates residual deformation, so that the swinging wall loses the initial rigidity when undergoing small deformation. Likewise, the shape memory alloy member will also degrade at low temperatures and behave as a normal metal member, resulting in the rocking wall losing its initial stiffness due to the effect of residual deformation when it undergoes small deformation after undergoing a large deformation.
In patent 201710930096.5, a self-resetting swinging wall assembly based on shape memory alloy bars is disclosed, the energy consumption and self-resetting performance of which is based on the tensile behavior of the shape memory alloy bars, while the shape memory alloy bars are in a non-working state when they are pressed. In fact, due to the randomness and unpredictability of the earthquake peak, the structure will often generate deformation (such as a peak value interlayer displacement angle larger than a design target value) larger than the design target value in an actual earthquake, at this time, the shape memory alloy bar will generate residual deformation due to entering a strengthening stage, and the length of the shape memory alloy bar will be larger than the distance between the top anchor point and the bottom limit point of the memory alloy in the patent; this means that the shape memory alloy component of the self-resetting swinging wall will lose its initial stiffness, i.e. no load-bearing capacity under this deformation, when the structure undergoes a small further deformation. Similarly, at low temperature, the shape memory alloy will degrade to the mechanical properties of common metals, and at this time, residual deformation will be generated when earthquake load is experienced, and the shape memory alloy component of the self-resetting swinging wall will lose initial rigidity and bearing capacity when small deformation occurs, and the principle is the same. The outer sleeve is introduced into the weakened area of the shape memory alloy rod, and the bottom of the outer sleeve is anchored with the foundation, so that the compression performance of the shape memory alloy rod is considered. Due to the action of the restraining sleeve, the shape memory alloy still can show good energy consumption, self-resetting and fatigue resistance when being pressed. The energy dissipation capability of the self-resetting swinging wall is also increased because the buckling restrained shape memory alloy can also consume energy when being pressed. Meanwhile, when a large earthquake occurs or at a lower temperature, the shape memory alloy has the performance of common metal, the buckling restrained shape memory alloy has the performance similar to that of a buckling restrained brace, and even if residual deformation exists, the initial rigidity and the bearing capacity cannot be lost.
Disclosure of Invention
The defects that the structure and the construction process of the existing prestressed self-resetting swinging wall are complex, the rigidity is large after nominal yielding, the allowable deformation is limited, and the shape memory alloy component of the existing shape memory alloy self-resetting swinging wall is easy to buckle and break under compression and easily loses the initial rigidity under heavy earthquake and low temperature are overcome; the invention provides a self-resetting swinging wall based on a buckling restrained shape memory alloy bar; the self-resetting swinging wall has good energy consumption performance and self-resetting capability under the action of earthquake load, has a large allowable deformation range and symmetrical reciprocating load behaviors, and does not lose initial rigidity at low temperature and after excessive deformation; the damage control is realized, the structural beam member cannot be damaged after the earthquake, and the function can be recovered only by replacing the shape memory alloy rod and the damper between the walls. Meanwhile, the friction wall is introduced into the swing wall system, so that the energy dissipation capability of the swing wall system is effectively improved. The invention has simple structure, simple and convenient production and installation and higher economic benefit.
One of the objectives of the present invention is to provide a self-resetting rocking wall based on buckling restrained shape memory alloy bars.
The invention also aims to provide a steel structure building of the self-resetting swinging wall comprising the buckling restrained shape memory alloy bars.
In order to achieve the purpose, the technical scheme adopted by the invention for solving the technical problems is as follows:
the invention provides a self-resetting swinging wall based on buckling restrained shape memory alloy bars, which consists of a swinging wall body, a foundation beam, a wall body connecting system, shape memory alloy bars, a restraining sleeve, an anchoring device, a pre-embedded sleeve, a main body frame or wall body, dampers between wall bodies, a friction wall and friction plates, wherein: the swing wall body is connected with the foundation beam through a wall body connecting system, the wall body connecting system ensures that the swing wall body is hinged with the foundation beam, and a sufficient rotating space is reserved for the swing wall body; the shape memory alloy rod is arranged between the wall body and the foundation beam, the bottom of the shape memory alloy rod is connected with the foundation beam through an anchoring device, the top of the shape memory alloy rod is connected with the swinging wall body through a pre-embedded sleeve, and the shape memory alloy rod provides rotational rigidity and simultaneously provides energy consumption performance and self-resetting performance for the swinging wall under the action of an earthquake based on the martensite-austenite phase change characteristic of the shape memory alloy rod; the restraining sleeve is arranged on the peripheral side of the shape memory alloy rod and wraps the shape memory alloy rod, and the restraining sleeve can restrain the shape memory alloy rod from buckling under pressure, so that the ductility and the bearing capacity of the shape memory alloy rod under pressure are effectively improved; the main body frames or walls are arranged on two sides of the swinging wall body, and are connected through a plurality of groups of dampers between the wall bodies, and the dampers between the wall bodies can increase the energy dissipation capacity of the swinging wall; the friction wall and the swinging wall body are arranged in parallel, and the friction wall is fixed; a friction plate is arranged between the friction wall and the swinging wall body so as to improve the energy dissipation capacity of the swinging wall system; the shape memory alloy rod applies pretightening force in a thread-overscrewing mode so as to overcome the return resistance caused by the damper and friction between walls.
Under the applicable environment temperature, when an earthquake occurs, the swinging wall body rotates around the hinge near the foundation beam, so that the shape memory alloy rods positioned on the two sides of the rotation center are respectively in a tension state and a compression state, and the earthquake energy is consumed. In the process, the restraining action of the restraining sleeve on the shape memory alloy rod ensures the compression behavior of the shape memory alloy rod. Meanwhile, the dampers positioned between the walls consume seismic energy due to dislocation deformation of each wall or between the wall and the main frame, and friction energy consumption is realized due to dislocation deformation between the swing wall and the friction wall. Due to the characteristics of the shape memory alloy, after the shape memory alloy rod is detached under the action of an earthquake, the shape memory alloy rod returns to the original position, the pretightening force of the shape memory alloy rod can overcome the return resistance of the dampers among the walls, the swinging wall and the friction wall to return to the original position, and the self-resetting swinging wall has no residual deformation. In the whole loading process, as the shape memory alloy rods are symmetrically arranged relative to the rotation center, the hysteretic behavior of the swinging wall during reciprocating motion is symmetrical. At low temperatures, the performance of the shape memory alloy degrades to that of common metals, and the swing wall will behave like a conventional swing wall. When the rocking wall undergoes deformation beyond the design tolerance, even if the shape memory alloy rod undergoes residual deformation, the rocking wall can still exhibit the characteristics of the conventional rocking wall when the rocking wall undergoes small deformation smaller than the residual deformation again, without losing the initial rigidity.
Furthermore, one end of the wall connecting system is fixedly connected with the swinging wall, the other end of the wall connecting system is connected with the foundation beam through a hinged joint, and the hinged joint of the wall connecting system is close to the foundation beam. The wall connection should ensure that the swinging wall can rotate around the hinge point with sufficient space.
In the invention, the shape memory alloy rods are divided into two groups and are symmetrically arranged at two sides of a hinge point of the wall connecting system and the foundation beam; every group includes many vertical settings and the shape memory alloy stick that is parallel to each other, and every shape memory alloy stick's one end is through pre-buried in swaing the wall internal pre-buried muffjoint, the other end with the foundation beam passes through anchor (girder steel) or pre-buried sleeve (concrete beam) are connected.
Furthermore, each group of shape memory alloy rods can be provided with a plurality of shape memory alloys according to actual requirements.
Furthermore, the middle part of the shape memory alloy rod is a weakening area, the two ends of the shape memory alloy rod are anchoring areas, and a transition area is arranged between the weakening area and the anchoring areas; wherein: the section of the weakening area can be round, rectangular and the like; the anchoring zone should be threaded; and the minimum net cross-sectional area of the anchoring area should be larger than the minimum net cross-sectional area of the weakening area.
Further, the shape memory alloy rod is made of a shape memory alloy material, such as a nickel-titanium alloy material.
Further, the allowable deformation of the shape memory alloy rod should be greater than the maximum deformation under a design reference earthquake.
Further, when the shape memory alloy rod is connected with other components through the anchoring device, bolts are arranged on two sides of the anchoring device to ensure that the anchoring device does not generate relative displacement under the condition of axial force in any direction.
Further, the anchoring device can be in various forms such as a block shape, an angle steel shape and a plate shape.
In the invention, the restraining sleeve is arranged on the peripheral side of the shape memory alloy rod and wraps the shape memory alloy rod.
Furthermore, the restraining sleeve is in various forms such as a cylinder, a cuboid and the like, the middle part of the restraining sleeve is provided with a long groove matched with the section of the weakened area of the shape memory alloy rod; wherein, a clearance of 1-2mm is left between the wall of the long groove and the outer wall of the shape memory alloy rod weakening area.
Preferably, the restraining sleeve can be formed by splicing two steel plates provided with long grooves; the inner groove of the restraint sleeve is formed by the long grooves of the two steel plates together.
Further, the length of the restraining sleeve is slightly smaller than the weakened section length of the shape memory alloy rod, and the length difference is slightly smaller than the design allowable deformation value of the shape memory alloy rod.
Further, a gap between the inner groove of the constraint sleeve and the shape memory alloy rod is filled with a non-adhesive material; the non-adhesive material may be epoxy, rubber layer, lithium-based grease, soft glass, etc.
Furthermore, the swinging wall body and the main body frames or the wall bodies on the two sides can be connected through dampers in various forms, and the dampers are symmetrically arranged to ensure that the reciprocating behavior of the swinging wall is symmetrical.
In the invention, the friction wall and the swinging wall body are arranged in parallel and are fixedly connected with the foundation beam, and the connection needs to ensure that no relative displacement exists between the friction wall and the foundation beam when the structure generates lateral displacement deformation.
Furthermore, a friction plate is arranged between the friction wall and the swinging wall body.
Further, the friction plate may be made of aluminum or steel.
In the invention, the shape memory alloy rod applies enough pretightening force in the form of the super-twisted thread so as to overcome the reset resistance of the damper.
In the invention, the components are provided with stiffening ribs according to requirements.
The invention also provides a steel structure building, which comprises the self-resetting swinging wall based on the buckling restrained shape memory alloy bars.
The invention has the beneficial effects that:
under the normal use state, this rocking wall can have better bearing capacity. When an earthquake occurs, the swinging wall body rotates around the hinge point relative to the foundation beam, so that the shape memory alloy rods positioned on two sides of the rotation center are in a pulled state and a pressed state respectively and consume earthquake energy. Meanwhile, the dampers between the walls consume seismic energy due to the dislocation deformation between the walls or between the walls and the main frame, and the dislocation deformation between the swing walls and the friction walls realizes friction energy consumption. If the structure is in the applicable environment temperature, due to the characteristics of the shape memory alloy, after the shape memory alloy rod is detached under the action of an earthquake, the shape memory alloy rod returns to the original position, the pretightening force of the shape memory alloy rod can overcome the reset resistance of the dampers between the walls to reset the dampers between the walls, and the whole swing wall has no residual deformation. And because the shape memory alloy rods are symmetrically arranged relative to the rotation center, the hysteretic behavior of the swinging wall during reciprocating motion is symmetrical. The arrangement mode of the shape memory alloy rod and the constraint sleeve ensures that the compression performance of the shape memory alloy rod is utilized. Meanwhile, if the structure is in a low-temperature environment, the performance of the shape memory alloy is degraded to the performance of common metal, the mechanical behavior of the shape memory alloy rod and the constraint sleeve is similar to that of a buckling constraint support, so that the swing wall still has energy dissipation capacity under the action of an earthquake, and the swing wall cannot lose initial rigidity even though self-resetting capacity is lost. Similarly, if the swinging wall undergoes deformation beyond the design allowable range, even if the shape memory alloy rod generates residual deformation, the swinging wall can still show the characteristics of the traditional swinging wall when undergoing deformation smaller than the residual deformation again, and the initial rigidity cannot be lost; the damage control is realized, the structural beam member cannot be damaged after the earthquake, and the function can be recovered only by replacing the shape memory alloy rod and the damper between the walls; meanwhile, the swing wall also has the general advantages of the shape memory alloy self-resetting swing wall, including good energy consumption and self-resetting capability, simple structure and construction process, large allowable deformation range, good durability and fatigue resistance, high comprehensive economic benefit and the like.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural view of an embodiment of a self-resetting rocking wall based on buckling restrained shape memory alloy bars according to the present invention;
FIG. 2 is a schematic view of one embodiment of a shape memory alloy rod in accordance with the present invention;
FIG. 3 is a schematic view of one embodiment of a constraining sleeve of the present invention;
FIG. 4 is a schematic view of one embodiment of a pre-buried sleeve of the present invention;
FIG. 5 is a schematic view of one embodiment of an anchoring device in the present invention;
FIG. 6 is an enlarged view of a portion of the present invention;
in the figure: the wall comprises a swinging wall body 1, a foundation beam 2, a wall body connecting system 3, a hinge point 3-1, a shape memory alloy rod 4, a weakening area 4-1, anchoring areas at two ends 4-2, a transition area arranged between the weakening area 4-3 and the anchoring area, a restraining sleeve 5, an anchoring device 6-1, a wing plate 6-2, a wing plate 6-3, a reinforcing plate 6-3, an anchoring embedded sleeve 7, a main body frame or wall body 8, a damper between the wall bodies 9, a friction wall 10 and a friction plate 11.
Detailed Description
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an", and/or "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof;
for convenience of description, the words "up", "down", "left" and "right" in the present invention, if any, merely indicate correspondence with up, down, left and right directions of the drawings themselves, and do not limit the structure, but merely facilitate the description of the invention and simplify the description, rather than indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
The terms "mounted", "connected", "fixed", and the like in the present invention are to be understood in a broad sense, and may be, for example, fixedly connected, detachably connected, or integrated; the two components can be connected mechanically or electrically, directly or indirectly through an intermediate medium, or connected internally or in an interaction relationship, and the terms used in the present invention should be understood as having specific meanings to those skilled in the art.
As described in the background, the self-resetting rocking walls proposed so far in the prior art mainly include two types of prestressed self-resetting rocking walls and shape memory alloy self-resetting rocking walls. The prestressed self-reset swinging wall consumes seismic energy through energy consumption elements and realizes self-reset through the pretension of prestressed tendons. The construction and construction process of the prestressed self-resetting swinging wall are complex, the nominal yield stiffness is high, and the allowable deformation is limited. Under the influence of reciprocating loading under the action of earthquake, the pre-tension ribs can also be loosened, so that the swinging wall loses the initial rigidity when undergoing small deformation. The shape memory alloy self-resetting swinging wall realizes energy consumption and self-resetting performance through the superelasticity of the shape memory alloy material. The existing shape memory alloy self-resetting swinging wall adopts shape memory alloy wires and rods or bolts, but the shape memory alloy self-resetting swinging wall is based on that the shape memory alloy materials are only pulled. This means that the shape memory alloy components of this type of self-resetting swinging wall are in a non-working state when compressed, and particularly for the shape memory alloy components using rods and screws, the shape memory alloy components are easy to bend and break when compressed. When a large shock occurs, the peak value of the shape memory alloy component is deformed too much and enters a strengthening stage, the component generates residual deformation, so that the swinging wall loses the initial rigidity when undergoing small deformation. Similarly, the shape memory alloy component is also degraded at low temperature and shows the behavior of a common metal component, so that the swing wall loses initial rigidity due to the influence of residual deformation when undergoing a small deformation after undergoing a large deformation, and in order to solve the technical problem, the self-resetting swing wall based on the buckling restrained shape memory alloy rod is provided; the self-resetting swinging wall has good energy consumption performance and self-resetting capability under the action of earthquake load, has large allowable deformation range and stronger energy consumption capability, has symmetrical reciprocating load behaviors, and cannot lose initial rigidity at low temperature and after excessive deformation; damage control is realized, the structural beam member cannot be damaged after the earthquake, and the function can be recovered only by replacing the shape memory alloy rod; and the structure is simple, the production and the installation are simple and convenient, and the economic benefit is higher.
In a typical embodiment of the present application, as shown in fig. 1 to 6, the swinging wall is composed of a swinging wall 1, a foundation beam 2, a wall connection system 3, a shape memory alloy rod 4, a restraining sleeve 5, an anchoring device 6, an anchoring embedded sleeve 7, a main frame or wall 8, an inter-wall damper 9, a friction wall 10 and a friction plate 11, wherein: the swinging wall body 1 is a concrete shear wall with high rigidity; the foundation beam 2 is a steel beam with an H-shaped section; the swing wall 1 and the foundation beam 2 are connected by a wall connecting system 3, preferably, the wall connecting system 3 is an inverted triangular rod system, the top end of the wall connecting system is welded (fixedly connected) with the swing wall through an embedded steel plate, and the bottom end of the wall connecting system is connected with the upper flange plate 2-1 of the foundation beam through a hinged support; and a sufficient rotating space is reserved for the swinging wall.
The shape memory alloy rod is arranged between the swinging wall body 1 and the foundation beam 2, is connected with the foundation beam 2 through an anchoring device 6, and is connected with the swinging wall body 1 through a pre-embedded sleeve 7, and provides rotational rigidity and energy consumption performance and self-resetting performance for the swinging wall under the action of an earthquake based on the martensite-austenite phase change characteristic of the shape memory alloy rod; the restraining sleeve 5 is arranged on the peripheral side of the shape memory alloy rod 4 and wraps the shape memory alloy rod, and can restrain the shape memory alloy rod from buckling under pressure, so that the ductility and the bearing capacity of the shape memory alloy rod under pressure are effectively improved; the main body frames 8 are arranged on two sides of the swinging wall body 1 and are connected through 5 groups of wall body dampers, the wall body dampers are metal yield dampers, and the dampers can increase the energy dissipation capacity of the swinging wall; the friction wall 10 is fixedly connected with the foundation beam 2, and when the swinging wall body 1 swings, relative dislocation deformation is generated between the friction wall 10 and the foundation beam, so that friction is generated to consume seismic energy; the shape memory alloy rod applies pretightening force in a thread overtorking mode to overcome the return resistance of the dampers.
In this embodiment, the "super-screwing mode" refers to a shape memory alloy rod in which both ends of the shape memory alloy rod are in threaded connection, and the shape memory alloy rod is stretched for a certain length every time the shape memory alloy rod is screwed for several turns, so as to generate an internal stress, i.e., a pre-tensioning stress; similar to pre-tensioned steel strands; the term "over" as used herein means several more twists.
The wall connecting system 3 is an inverted triangular rod system, the rod piece has a rectangular cross section and is made of steel;
the swing wall body 1 is hinged with the foundation beam 2, and a hinged point is positioned on the outer side of an upper flange 2-1 of the foundation beam 2.
The shape memory alloy rods 4 are divided into two groups, a plurality of shape memory alloy rods 4 can be arranged in each group, and the specific number can be a plurality of shape memory alloys according to actual requirements. For example, 2 pieces of the wall connecting system 3 can be symmetrically arranged at two sides of a hinge point 3-1 of the wall connecting system 3 and the foundation beam 2; one end of each shape memory alloy rod 4 is connected with the swinging wall 1 through the embedded sleeve 7 embedded in the swinging wall 1, and the other end of each shape memory alloy rod is connected with the foundation beam 2 through the anchoring device 6. Preferably, as shown in fig. 3, the shape memory alloy rod 4 is designed such that: the middle part is a weakening area 4-1, the two ends are anchoring areas 4-2, and a transition area 4-3 is arranged between the weakening area and the anchoring areas. Wherein: the cross section of the weakened area 4-3 can be circular; the anchoring area 4-2 is engraved with threads; and the minimum net cross-sectional area of the anchor region 4-2 is greater than the minimum net cross-sectional area of the weakened region 4-1.
Preferably, the shape memory alloy rod 4 is made of a nickel-titanium alloy material. The allowable deformation of the shape memory alloy rod 4 should be greater than the maximum deformation under a design reference earthquake.
When the shape memory alloy rod 4 is connected with the anchoring device 6, bolts are arranged on two sides of the anchoring device 6 to ensure that the anchoring plate 6 and the shape memory alloy rod 4 do not generate relative displacement under the condition of axial force in any direction.
Preferably, the anchoring device 6 is L-shaped and a reinforcing plate 6-3 is arranged between the two wing plates 6-1 and 6-2.
Preferably, the embedded sleeve 7 is a cylindrical sleeve, and the inner side of the embedded sleeve is provided with a thread matched with the anchoring area 4-1 of the shape memory alloy rod.
Preferably, the restraining sleeve 5 is mounted on the periphery of the shape memory alloy rod 4 and wraps the shape memory alloy rod 3.
Preferably, the restraining sleeve 5 is a cylinder with a long groove with a circular cross section in the middle; wherein, a 2mm gap is left between the wall of the long groove and the outer wall of the shape memory alloy rod weakening area.
Preferably, the length of the restraining sleeve 5 is smaller than the length of the weakened area 4-1 of the shape memory alloy rod 4, and the length difference is slightly smaller than the design allowable deformation value of the shape memory alloy rod.
Preferably, the main frame 8 is arranged on two sides of the swinging wall 1; the swinging wall body 1 is connected with the main body frames 8 at two sides through metal yielding type dampers 9. The metal yielding dampers 9 are divided into two groups, each group is provided with a plurality of dampers, as shown in the figure, each group can be provided with 5 dampers, and the dampers are symmetrically arranged on two sides of the swinging wall body 1 to ensure that the swinging wall is symmetrical in reciprocating action.
Further, the friction wall 10 is arranged in parallel with the swinging wall 1, and the friction wall 10 is required to be fixed; the concrete connection mode can refer to fig. 6, the bottom of the friction wall is fixedly connected with the foundation beam 2, the top of the friction wall is fixedly connected with other devices, and the connection needs to ensure that no relative displacement exists between the friction wall and the foundation beam 2 when the structure generates lateral displacement deformation.
Further, a friction plate 11 is arranged between the friction wall 10 and the swinging wall 1. Preferably, the friction plate 11 may be an aluminum friction plate.
The shape memory alloy rod 4 applies enough pretightening force in the form of super-twisted threads so as to overcome the reset resistance of the damper.
Under the normal use state, this rocking wall can have better bearing capacity. When an earthquake occurs, the swinging wall body rotates around the hinge point relative to the foundation beam, so that the shape memory alloy rods positioned on two sides of the rotation center are in a pulled state and a pressed state respectively and consume earthquake energy. Meanwhile, the damper between the walls consumes seismic energy due to the dislocation deformation between the walls and the main frame, and the relative dislocation deformation between the swing walls and the friction wall realizes friction energy consumption. If the structure is in the applicable environment temperature, due to the characteristics of the shape memory alloy, after the shape memory alloy rod is detached under the action of an earthquake, the shape memory alloy rod returns to the original position, the pretightening force of the shape memory alloy rod can overcome the reset resistance of the dampers between the walls to reset the dampers between the walls, and the whole swing wall has no residual deformation. And because the shape memory alloy rods are symmetrically arranged relative to the rotation center, the hysteretic behavior of the swinging wall during reciprocating motion is symmetrical. If the structure is in a low-temperature environment, the performance of the shape memory alloy is degraded to the performance of common metal, and the swinging wall can show the behavior of the traditional swinging wall under the action of an earthquake without losing the initial rigidity. If the rocking wall undergoes deformation beyond the design tolerance, even if the shape memory alloy rod undergoes residual deformation, the rocking wall can still exhibit the characteristics of the conventional rocking wall when the rocking wall undergoes deformation less than the residual deformation again, without losing the initial rigidity. Meanwhile, the swing wall also has the general advantages of the shape memory alloy self-resetting swing wall, including good energy consumption and self-resetting capability, simple structure and construction process, large allowable deformation range, no need of repairing the swing wall after an earthquake, good durability and fatigue resistance, high comprehensive economic benefit and the like.
In another aspect, the invention provides a steel structure building, which comprises the self-resetting swinging wall based on the buckling restrained shape memory alloy bars. The steel structure building has the advantages that the energy consumption performance of the swing wall is good, so that when an earthquake happens, the energy input into the main structural member is small, and the structural member can be effectively protected; because of the excellent superelasticity of the shape memory alloy material, the shape memory alloy material has extremely small residual deformation after earthquake action, thereby providing convenience for the building repair after the earthquake; more importantly, the building does not lose rigidity under the earthquake action exceeding the design reference strength and at low temperature, and compared with the existing self-resetting building, the building is simpler in structure and more convenient and fast to construct, and the construction quality of the building can be effectively guaranteed.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (9)

1. The utility model provides a wall sways from restoring to throne based on bucking restraint shape memory alloy rod, its characterized in that comprises wall body, foundation beam, wall connection system, shape memory alloy rod, restraint sleeve, anchor, pre-buried sleeve, main body frame or wall body, wall body inter-damper, friction wall and friction disc, wherein: the swing wall body is connected with the foundation beam through a wall body connecting system, the wall body connecting system ensures that the swing wall body is hinged with the foundation beam, and a sufficient rotating space is reserved for the swing wall body; the shape memory alloy rod is arranged between the swinging wall and the foundation beam, the bottom of the shape memory alloy rod is connected with the foundation beam through an anchoring device, and the top of the shape memory alloy rod is connected with the swinging wall through a pre-buried sleeve; the restraining sleeve is arranged on the periphery of the shape memory alloy rod and wraps the shape memory alloy rod; the main body frame or the wall body is arranged on two sides of the swinging wall body, and the main body frame or the wall body is connected with the swinging wall body through a plurality of groups of dampers between the wall bodies; the friction wall and the swinging wall body are arranged in parallel, and the friction wall is fixed; a friction plate is arranged between the friction wall and the swinging wall body;
the embedded sleeve is a cylindrical sleeve, and the inner side of the embedded sleeve is provided with a thread matched with the shape memory alloy rod; both ends of the shape memory alloy rod are the shape memory alloy rods in threaded connection, and the shape memory alloy rod is stretched for a certain length when the threads are screwed for a plurality of times, so that internal stress, namely pretension stress is generated;
the shape memory alloy rods are divided into two groups and are symmetrically arranged on two sides of a hinge joint of the wall body connecting system and the foundation beam; each group includes many vertical settings and the shape memory alloy stick that is parallel to each other, every shape memory alloy stick one end with sway the wall body through pre-buried in swaying the wall body pre-buried muffjoint, the other end with the foundation beam passes through anchor or pre-buried muffjoint.
2. The self-resetting rocking wall based on buckling restrained shape memory alloy rods of claim 1, wherein the shape memory alloy rods are provided with a weakening area in the middle and anchoring areas at two ends, and a transition area is arranged between the weakening area and the anchoring area.
3. The buckling-restrained shape memory alloy rod-based self-resetting rocking wall of claim 2, wherein the weakened section is circular or rectangular in cross-sectional shape.
4. The buckling-restrained shape memory alloy bar-based self-resetting rocking wall of claim 3, wherein the anchoring zone is threaded; and the minimum net sectional area of the anchoring area is larger than the minimum net sectional area of the weakening area.
5. The self-resetting swinging wall based on the buckling restrained shape memory alloy bar as claimed in claim 1, wherein the restraining sleeve is a cylinder or a cuboid structure with a long groove in the middle part, the cross section of the long groove is matched with that of the weakened area of the shape memory alloy bar; and a gap is reserved between the wall of the long groove and the outer wall of the shape memory alloy rod weakening area.
6. The buckling-restrained shape memory alloy bar-based self-resetting swinging wall of claim 1, wherein the restraining sleeve is directly formed by splicing two steel plates provided with elongated slots; the inner groove of the restraint sleeve is formed by the long grooves of the two steel plates together.
7. The buckling-restrained shape memory alloy rod-based self-resetting rocking wall of claim 1, wherein the restraining sleeve has a length slightly less than the weakened section length of the shape memory alloy rod, and the difference in length is slightly less than the design allowable deformation value of the shape memory alloy rod.
8. The buckling-restrained shape memory alloy rod-based self-resetting rocking wall of claim 1, wherein a gap between the inner groove of the restraining sleeve and the shape memory alloy rod is filled with a non-binding material.
9. A steel structural building comprising a self-resettable rocking wall based on a buckling restrained shape memory alloy rod according to any one of claims 1 to 8.
CN201810928018.6A 2018-08-15 2018-08-15 Self-resetting swinging wall containing buckling restrained shape memory alloy bars and building Active CN108930346B (en)

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