CN110005091B - Bottom hinged low-damage self-resetting shear wall - Google Patents
Bottom hinged low-damage self-resetting shear wall Download PDFInfo
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- CN110005091B CN110005091B CN201910233010.2A CN201910233010A CN110005091B CN 110005091 B CN110005091 B CN 110005091B CN 201910233010 A CN201910233010 A CN 201910233010A CN 110005091 B CN110005091 B CN 110005091B
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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
- E04B2/00—Walls, e.g. partitions, for buildings; Wall construction with regard to insulation; Connections specially adapted to walls
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- 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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Abstract
The invention relates to a bottom hinged low-damage self-resetting shear wall, which comprises: the self-resetting wall comprises a reinforced concrete wallboard, a self-resetting wall bottom and a foundation beam; the reinforced concrete wallboard is connected with the upper end of the self-resetting wall bottom, and the foundation beam is connected with the lower end of the self-resetting wall bottom; the middle part of the upper surface of the foundation beam is provided with a connecting plate, the connecting plate is provided with a connecting beam hinged joint, and two sides of the connecting beam hinged joint are respectively provided with a self-resetting short support hinged joint II; the self-reset wall bottom comprises: connecting beams and self-resetting short supports; the upper surface of the connecting beam is provided with a shear key, the middle part of the lower surface of the connecting beam is provided with a foundation beam hinged joint, and the two ends of the lower surface of the connecting beam are respectively provided with a self-resetting short support hinged joint I at the positions corresponding to the two self-resetting short support hinged joints II; the self-resetting short support comprises an inner pipe, an outer pipe, a disc spring and a baffle; the disc spring is arranged in the outer pipe, the two ends of the disc spring are provided with baffles, the inner pipe penetrates through an inner hole of the disc spring and the baffles at the two ends and is capped at the two ends of the inner pipe through check blocks, and the two ends of the self-resetting short support are provided with self-resetting short support hinged joints III.
Description
Technical Field
The invention belongs to the technical field of building structures, relates to a shear wall with a self-resetting function, and particularly relates to an assembled produced reinforced concrete shear wall with resetting capability, which comprises concrete, reinforcing steel bars, profile steel and self-resetting supports.
Background
Earthquake is one of the main natural disasters facing the current human society, has the characteristics of strong burst property, large destructiveness, profound social influence and capability of causing secondary disasters, and easily causes casualties, building collapse, traffic paralysis, communication interruption and life line engineering damage. The traditional earthquake-resistant design concept takes life protection as a primary objective, and the structure is designed in a ductility manner by means of plastic deformation and irreversible damage, so that casualties and building collapse are effectively reduced and avoided, but the structural function is interrupted due to serious damage and obvious residual deformation of the structure, the functional requirement can be recovered by long-time high-cost repair and even reconstruction, and economic loss and influence brought to the society are still heavy. In recent years, the design concept of functional recoverability (resilient) for recovering the use function of a structure without repair or simple repair after earthquake gradually becomes the focus of attention of the earthquake engineering community. The replaceable design concept and the self-reset design concept can respectively realize the periodic replacement and the nondestructive deformation of the vulnerable part of the structure, so that the structure can quickly recover the use function after the earthquake, and the function recoverability of the structure and even the city is realized. The current function-recoverable structure or component comprises a self-resetting swinging wall, a self-resetting swinging frame, a self-resetting support, a self-resetting damper, a replaceable coupling beam, a replaceable wall footing shear wall and the like.
The reinforced concrete shear wall has high lateral rigidity and high bearing capacity, and is widely applied to high-rise and super high-rise structures. However, due to the obvious brittleness of the concrete material, the bottom of the wall body is easy to crush and form plastic hinges when the structure is greatly deformed, so that the residual deformation is obvious, and the structural function is lost or even collapsed. The combined concrete shear wall is formed by additionally arranging profile steel, steel pipes or hidden struts and the like in the edge constraint area of the traditional concrete shear wall, the bearing capacity, the lateral rigidity and the ductility of the combined concrete shear wall are improved, but the plastic damage of the wall body cannot be avoided, and the function recovery of the shear wall cannot be realized. At present, the function recoverable concrete shear wall mainly has two forms of a prestressed self-recovering concrete shear wall and a replaceable wall footing shear wall. The prestressed self-resetting concrete shear wall is characterized in that a connecting interface of the bottom of the wall and a foundation is expanded, post-expanded unbonded prestressed tendons anchored to the foundation are arranged in the wall, the wall body and the foundation are separated, rigid deformation of the wallboard can be realized, damage to the wall body is reduced, and restoring force is provided to drive the wall body to reset when the prestressed tendons deform. However, the wall body is low in vertical bearing capacity, poor in out-of-plane stability and remarkable in lateral deformation, is often cooperative with a frame, is limited in applicable height and is not applicable to a pure shear wall structure. Replaceable wall base shear wall carries out removable design to the vulnerable wall base of traditional wall body, concentrates on removable region with the plasticity destruction of wall body deformation in-process, realizes the quick restoration of structural function through the change in removable region after the earthquake. But the wall section is weakened, reducing bearing capacity and out-of-plane stability.
Disclosure of Invention
The invention provides a self-resetting concrete shear wall with a hinged wall bottom and capable of realizing large-degree elastic deformation, and aims to solve the problems that a wall foot is easy to crush, a wall bottom is easy to form a plastic hinge and is insufficient in ductility when a traditional concrete shear wall deforms, a prestressed self-resetting concrete shear wall is low in bearing capacity and prone to loss of pretension, a replaceable wall foot shear wall is low in bearing capacity and remarkable in residual deformation and the like. In order to improve the structural performance level, the self-resetting design is carried out on the wall bottom part which can be seriously damaged when the traditional shear wall is subjected to a huge earthquake, a self-resetting section with larger deformability is constructed by combining the section steel beam and the self-resetting support, and the self-resetting section is connected with the reinforced concrete wallboard and the foundation beam to form the self-resetting concrete shear wall. The self-resetting support with the bilinear hysteresis characteristic is designed by utilizing the characteristics of large rigidity, high bearing capacity, flexible use and the like of the disc spring. Shaped steel roof beam top surface is connected with the wallboard, and roof beam middle part is articulated with basic roof beam, arranges in both ends again from restoring to the throne and supports, forms the rotating cross-section that has bilinear hysteresis characteristic for concrete shear force wall wallboard bottom does not have obvious plastic damage and can realize restoring to the throne after taking place great lateral deformation, and concrete technical scheme is as follows:
a bottom hinged low damage self-resetting shear wall comprising: 1-1 parts of reinforced concrete wall boards, 1-2 parts of self-resetting wall bottoms and 1-3 parts of foundation beams;
the reinforced concrete wallboard 1-1 is connected with the upper end of the self-resetting wall bottom 1-2, and the foundation beam 1-3 is connected with the lower end of the self-resetting wall bottom 1-2;
the reinforced concrete wallboard 1-1 is designed according to the current specification, is manufactured by binding a reinforcing mesh and then pouring concrete, and comprises an edge constraint component and a non-constraint area, wherein vertical stressed reinforcing steel bars and dense stirrups are arranged in the edge constraint component, and vertical stressed reinforcing steel bars and horizontal distribution reinforcing steel bars are arranged in the non-constraint area;
the middle part of the upper surface of the foundation beam 1-3 is provided with a connecting plate, the connecting plate is provided with a connecting beam hinged joint 3-2, and two sides of the connecting beam hinged joint 3-2 are respectively provided with a self-resetting short support hinged joint II 3-3;
the self-resetting wall bottom 1-2 comprises: 2-1 of a connecting beam and 4-4 of two self-resetting short supports;
the upper surface of the connecting beam 2-1 is provided with a plurality of shear keys 2-5, the middle part of the lower surface is provided with a foundation beam hinged joint 2-2, and the two ends of the lower surface are respectively provided with a self-resetting short support hinged joint I2-3 at the position corresponding to the two self-resetting short support hinged joints II 3-3;
the self-resetting short support 4-4 comprises an inner pipe 4-2, an outer pipe 4-1, a disc spring 4-5 and a baffle 4-3; the disc spring 4-5 is arranged in the outer pipe 4-1, two ends of the disc spring 4-5 are respectively provided with a baffle 4-3, the inner pipe 4-2 penetrates through an inner hole of the disc spring 4-5 and the baffles 4-3 at two ends and is capped at two ends of the inner pipe 4-2 through a stop block, and two ends of the self-resetting short support 4-4 are provided with self-resetting short support hinged joints III 4-6;
the self-resetting short support hinged joints III 4-6 at one ends of the two self-resetting short supports 4-4 are respectively hinged with the self-resetting short support hinged joints I2-3 at two ends of the connecting beam 2-1, and the self-resetting short support hinged joints III 4-6 at the other ends of the two self-resetting short supports 4-4 are respectively hinged with the two self-resetting short support hinged joints II 3-3 on the foundation beam 1-3.
The foundation beam hinged joint 2-2 is hinged with the connecting beam hinged joint 3-2;
the upper surface of the connecting beam 2-1 is in contact with a reinforced concrete wallboard 1-1, the shear keys 2-5 are embedded into the reinforced concrete wallboard 1-1, horizontal distribution ribs and vertical stress reinforcement bar ends in the reinforced concrete wallboard 1-1 are welded on the upper surface of the connecting beam 2-1, and the shear keys 2-5 are used for: the bonding capacity with concrete is enhanced;
on the basis of the scheme, the connecting beam 2-1 can be made into a horizontal or V-shaped form, and the bottom shape of the reinforced concrete wallboard 1-1 is poured into the horizontal or V-shaped form according to the shape of the connecting beam 2-1;
on the basis of the scheme, the concrete strength grade of the reinforced concrete wallboard 1-1 is not lower than C30, the stressed steel bar is not lower than HRB335, the stirrup is not lower than HPB300, and the specific design can be flexibly selected according to the current specification;
on the basis of the scheme, the connecting beam 2-1 and the foundation beam 1-3 can adopt Q235 grade B, C, D carbon structural steel and Q345 grade B, C, D, E low-alloy high-strength structural steel, and can also adopt steel grades with higher strength and rigidity when the toughness requirement is ensured;
on the basis of the scheme, the inner pipe 4-2 and the outer pipe 4-1 of the self-resetting short support 4-4 can be made of common carbon structural steel Q235 steel; the disc spring 4-5 is made of hot rolled spring steel with the grade of 60CrMnA, and the baffle 4-3 can be made of low-alloy high-strength structural steel Q345 steel.
On the basis of the scheme, a damper can be arranged between the connecting beam 2-1 and the foundation beam 1-3 of the self-resetting wall bottom 1-2 and is arranged as a self-resetting energy-consuming wall bottom.
The top surface of the connecting beam 2-1 in the self-resetting wall bottom 1-2 is connected with the reinforced concrete wall board 1-1, so that the internal force on the upper part of the wall body is stably and effectively transmitted to the foundation beam 1-3, horizontally distributed ribs and vertical stressed reinforcing steel bars in the reinforced concrete wall board 1-1 are welded on the top surface of the connecting beam 2-1, so that the connecting beam 2-1 and a reinforcing steel bar net in the reinforced concrete wall board 1-1 are integrated, and the shear keys 2-5 arranged on the top surface of the connecting beam 2-1 can strengthen the bonding with concrete. The bottom shape of the reinforced concrete wallboard 1-1 can be poured into a horizontal or V-shaped shape according to the shape of the connecting beam 2-1, the V-shaped connecting surface has a larger bonding area, the internal force transmission is more stable and effective, the V-shaped replacing area is more consistent with the failure mode of the traditional wallboard destruction, and the problem that the two sides of the horizontal connecting surface are easy to destroy when the wall body is displaced greatly is avoided. The middle part of the connecting beam 2-1 is hinged with the foundation beam 1-3, so that the wall body can rotate to a certain degree, and the axial pressure and the horizontal shearing force of the wall body are transmitted to the foundation beam 1-3 through the connecting hinge. Two sides of the connecting beam 2-1 are vertically provided with self-resetting short supports 4-4 with bilinear hysteresis characteristics, and two ends of the self-resetting short supports 4-4 are respectively hinged with reserved joints of the connecting beam 2-1 and the foundation beam 1-3. The foundation beams 1-3 are made of steel materials and can also be embedded in concrete to form a steel-concrete combined beam. Joints connected with the self-resetting short supports 4-4 and the connecting beams 2-1 are reserved on the top surfaces of the foundation beams 1-3, the rigidity and the bearing capacity of the joints are enhanced, and local buckling is avoided. The connecting beam 2-1, the self-resetting short support 4-4 and the foundation beam 1-3 form a bending-resistant wall bottom with a bilinear hysteresis characteristic, and the self-resetting wall bottom 1-2 has high rigidity when the wall body is displaced for a small time, so that the lateral rigidity of the structure is effectively provided; when the displacement of the wall body is increased, the self-resetting wall bottom 1-2 elastically rotates, and the rigidity is not reduced; when the displacement of the wall body is increased again, the self-resetting wall bottom 1-2 enters a second rigidity stage, and the internal force of the wall body at the upper part of the connecting beam 2-1 is not obviously increased; when the external load is reduced, the self-reset wall bottom 1-2 is restored to the original position, the wall body is driven to reset, and low-damage large deformation and reset of the wall body are achieved. The self-resetting short supports 4-4 arranged on two sides of the self-resetting wall bottom 1-2 have strokes meeting the rotating requirement of the wall body, and the rigidity of the connecting beam 2-1 and the foundation beam 1-3 meets the requirement that the self-resetting wall bottom 1-2 does not lose efficacy in the rotating process of the self-resetting wall bottom 1-2. A damper can be arranged between the connecting beam 2-1 and the foundation beam 1-3 of the self-resetting wall bottom 1-2 and is set as a self-resetting energy-consuming wall bottom.
The self-resetting short support 4-4 comprises an inner pipe 4-2, an outer pipe 4-1, a disc spring 4-5 and a baffle 4-3. After the disc spring 4-5 is pre-pressed, the baffles 4-3 are added at two ends and limited in the inner tube 4-2 and the outer tube 4-1, the inner tube 4-2 penetrates through the inner hole of the disc spring 4-5 and the baffles 4-3 at two sides, and a stop block is welded at the end part for capping. The self-reset short support 4-4 is always in a pressed state in the deformation process of being subjected to axial tension and pressure by the disc spring 4-5. When the axial load of the support is low, the self-resetting short support 4-4 is in a first rigidity stage, and the rigidity is provided by the inner pipe 4-2 and the outer pipe 4-1 together; when the axial load exceeds the pre-pressure of the disc spring 4-5, the inner pipe 4-2 and the outer pipe 4-1 are subjected to dislocation, and the self-resetting short support 4-4 enters a second rigidity stage; when the level of the external load is reduced, the disc spring 4-5 provides a reset force to push the inner tube 4-2 and the outer tube 4-1 to recover the initial state.
The bottom hinged low-damage self-resetting shear wall disclosed by the invention is realized as follows: when the self-resetting wall bottom is applied, the connecting beam 2-1, the foundation beam 1-3 and the self-resetting short support 4-4 are manufactured according to design requirements, the self-resetting wall bottom 1-2 is assembled at the wall bottom position of the reinforced concrete wall board 1-1, reinforcing steel bars are bound and welded with the top of the connecting beam 2-1, and finally concrete is poured. In addition, the wall body can be assembled in a construction site after being subjected to factory production, the reinforced concrete wall panel 1-1 and the foundation beam 1-3 connected with the foundation beam 1-3 can be respectively prefabricated in a factory, and the reinforced concrete wall panel 1-1, the foundation beam 1-3 and the self-resetting short support 4-4 are positioned and then connected in the construction site.
Under the normal use state, the wall body bears vertical load and smaller horizontal load, the load is transmitted to the foundation beam 1-3 from the reinforced concrete wallboard 1-1 through the connecting beam 2-1, the axial force and the shearing force transmitted by the reinforced concrete wallboard 1-1 are hinged, and the self-resetting short supports 4-4 axial forces on two sides form a couple to bear the bending moment transmitted by the reinforced concrete wallboard 1-1. When the structure is subjected to earthquake load, the lateral deformation of the shear wall is intensified, and the section 1-2 of the self-resetting wall bottom rotates. When the displacement of the wall body is small, the rotation of the self-resetting wall bottom 1-2 is small, the axial deformation of the support is small, the self-resetting short support 4-4 is in a first rigidity stage, and the self-resetting wall bottom 1-2 is in the first rigidity stage, so that the lateral deformation of the structure is effectively resisted; when the lateral displacement of the wall body is continuously increased to the extent that the traditional shear wall is subjected to wall foot crushing and wall bottom hinge yielding, the rotation of the self-resetting wall bottom 1-2 is increased, the axial deformation of the support is increased, but the self-resetting wall bottom 1-2 is in an elastic stage, and the wall body is not subjected to obvious plastic damage; the lateral displacement of the wall body is increased again, the rotation of the self-reset wall bottom 1-2 is increased again, the axial displacement of the support is increased again, the self-reset short support 4-4 enters a second rigidity stage, the self-reset wall bottom 1-2 enters the second rigidity stage, the internal force is not increased remarkably, the internal force of the upper reinforced concrete wallboard 1-1 is not increased remarkably any more, and the reinforced concrete wallboard 1-1 is not damaged. When an earthquake weakens, the earthquake load disappears, the disc spring 4-5 pushes the inner pipe and the outer pipe to drive the self-resetting short support 4-4 to reset, the self-resetting wall bottom 1-2 restores to the initial position under the action of the self-resetting short support 4-4, the reinforced concrete wall board 1-1 is driven to restore to the initial position, and the resetting of the shear wall is realized.
Meanwhile, a damper can be arranged between the connecting beam 2-1 and the foundation beam 1-3 according to design requirements, the damper is activated by utilizing displacement generated by rotation of the connecting beam 2-1 in the process of lateral movement of the wall body, earthquake input energy is dissipated, and the structure is protected.
The invention has the beneficial effects that:
compared with the traditional concrete shear wall, the concrete shear wall with the built-in section steel, the hidden support and the like, the prestressed self-resetting concrete shear wall and the shear wall with the replaceable wall footing, the bottom hinged low-damage self-resetting shear wall has the following characteristics:
compared with the traditional concrete shear wall, the bottom hinged low-damage self-resetting shear wall has the advantages that the wall bottom of the traditional shear wall which can generate plastic damage when being subjected to a larger earthquake load is replaced by the self-resetting wall bottom with the bilinear hysteresis characteristic, larger elastic deformation of the self-resetting wall bottom can be realized, and when the lateral movement of the wall body is larger, the self-resetting wall bottom enters a second rigidity stage, so that the internal force of the cross section of the self-resetting wall bottom is not increased suddenly, the internal force level of the reinforced concrete wallboard at the upper part is not improved any more, and the shear wall is enabled not to generate serious plastic damage or failure on the whole. After the earthquake load disappears, the traditional shear wall has obvious residual deformation, and the bottom hinged low-damage self-resetting shear wall can realize resetting under the driving of the bottom of the self-resetting wall without residual deformation.
Compared with concrete shear walls such as built-in section steel, hidden braces and the like, the design of the wall rigidity and the bearing capacity is not limited by the characteristics of the concrete material at the bottom of the wall; the self-resetting wall bottom with the bilinear hysteresis characteristic endows the shear wall with better ductility; the resetting performance of the wall bottom with the bilinear hysteresis characteristic ensures that the shear wall does not generate residual deformation and can realize the resetting of the wall body.
Compared with the prestressed self-resetting concrete shear wall, the prestressed self-resetting concrete shear wall has higher vertical bearing capacity; greater lateral stiffness; the problem of reduction of the resetting performance caused by the prestress loss of the prestressed rib is avoided; the damage to the wall base can not occur; out-of-plane stability is better.
Compared with the shear wall with the replaceable wall foot, the shear wall has higher vertical and horizontal bearing capacity; greater lateral stiffness; residual deformation is not generated, and the wall body can be reset; the damage degree is low, and the repair is not needed after the earthquake.
Drawings
The invention has the following drawings:
FIG. 1 is a schematic structural view of a bottom hinged low-damage self-resetting shear wall according to the present invention;
FIG. 2 is a schematic structural view of a coupling beam according to the present invention;
FIG. 3 is a schematic structural view of a foundation beam of the present invention;
FIG. 4 is a cross-sectional view of the self-restoring short strut of the present invention.
Reference numerals
The self-resetting wall comprises 1-1 reinforced concrete wall board, 1-2 self-resetting wall bottom, 1-3 foundation beams, 2-1 connecting beams, 2-2 foundation beam hinged joints, 2-3 self-resetting short support hinged joints I, 2-5 shear keys, 3-2 connecting beam hinged joints, 3-3 self-resetting short support hinged joints II, 4-1 outer pipes, 4-2 inner pipes, 4-3 baffle plates, 4-4 self-resetting short supports, 4-5 disc springs and 4-6 self-resetting short support hinged joints III.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings 1 to 4.
The invention relates to a bottom hinged low-damage self-resetting shear wall, which is structurally as shown in figure 1 and comprises reinforced concrete wallboards 1-1, self-resetting wall bottoms 1-2 and foundation beams 1-3. The reinforced concrete wallboard 1-1 can be manufactured by binding a reinforcing mesh and then pouring concrete according to the existing standard design. The foundation beams 1-3 can be made of steel or concrete materials under the condition of meeting the anchoring requirement. The self-resetting wall bottom 1-2 comprises a connecting beam 2-1 and a self-resetting short support 4-4;
the connection beam 2-1 as shown in fig. 2, the connection beam 2-1 is used for bearing and transmitting the internal force transmitted from the upper reinforced concrete wallboard 1-1, and needs to have enough rigidity to keep the effectiveness of a self-resetting wall bottom 1-2 mechanism; the foundation beam hinged joint 2-2 in the middle of the lower surface of the connecting beam 2-1 is connected with the connecting beam hinged joint 3-2 on the foundation beam 1-3, and the connection is used for effectively and stably transmitting the axial pressure and the horizontal shear force of the reinforced concrete wallboard 1-1; the self-resetting short support hinged joint I2-3 is used for connecting the upper parts of the self-resetting short supports 4-4, and the bending moment of the reinforced concrete wallboard 1-1 is born and transmitted by a bending moment couple formed by the self-resetting short supports 4-4 on two sides; the top surface of the connecting beam 2-1 is attached with the end of the reinforcing steel bar inside the reinforced concrete wallboard 1-1, and the shear key 2-5 penetrates into the reinforced concrete connecting beam 2-1 to be bonded with the reinforced concrete wallboard 1-1, so that the stable transmission of the internal force of the connecting interface is ensured. The foundation beam 1-3 is shown in figure 3, the foundation beam 1-3 is used for bearing the wall internal force transmitted by the self-resetting wall bottom 1-2, and enough rigidity is required for ensuring the effectiveness of the self-resetting wall bottom mechanism; the connecting beam hinged joint 3-2 connected with the connecting beam 2-1 is used for bearing axial pressure and horizontal shear force of a wall body and ensuring that local yielding does not occur; the self-resetting short support hinged joint II 3-3 connected with the lower part of the self-resetting short support 4-4 needs to have enough rigidity and bearing capacity to bear the axial acting force in the deformation range of the self-resetting wall bottom 1-2. A self-resetting short support 4-4 adopted by the self-resetting wall bottom 1-2 is shown in figure 4, a disc spring 4-5 is selected according to the design, then the disc springs of proper types are combined and stacked in series-parallel connection, baffles 4-3 are arranged at two ends of the disc spring, an inner pipe 4-2 of the self-resetting short support 4-4 penetrates through the baffles 4-3 and inner holes of the disc spring 4-5, a certain pre-pressure is applied to the disc spring 4-5 by compressing the baffles 4-3, the end part of the inner pipe 4-2 is welded to be sealed, the rebound of the disc spring 4-5 is limited to be kept in a pre-pressing state, an outer pipe 4-1 is sleeved on the outer parts of the disc spring 4-5 and the inner pipe 4-2. The self-resetting short support 4-4 has a bilinear hysteresis characteristic, the inner pipe 4-2 and the outer pipe 4-1 of the self-resetting short support 4-4 provide first rigidity, when the axial load of the self-resetting short support 4-4 reaches the pre-pressure of the disc spring 4-5, the inner pipe 4-1 starts to perform dislocation, the push-pull baffle 4-3 extrudes the disc spring 4-5, the self-resetting short support 4-4 enters a second rigidity stage, and the second rigidity is provided by the disc spring 4-5. The self-resetting wall bottom 1-2 aims to replace the hinge-out part of the traditional shear wall into an elastic area, replace the wall bottom of the shear wall of a selected layer, and replace the wall bottom only at the bottom of a structure with larger stress. The rigidity design of the self-resetting wall bottom 1-2 part needs to be matched with the rigidity of the reinforced concrete wall board 1-1 part, and the weak layer formed by the sudden change of the structural rigidity is avoided.
The implementation process of the bottom hinged low-damage self-resetting shear wall disclosed by the invention is as follows: when the self-resetting short support is applied, the self-resetting short support 4-4 is manufactured according to design requirements, the foundation beam 1-3, the connecting beam 2-1 and the self-resetting short support 4-4 are arranged at the bottom of the shear wall and are assembled, then a reinforcement cage is bound, the end of a connecting interface reinforcement is welded to the top of the connecting beam 2-1, a formwork is erected, concrete is poured finally, and the formwork is formed and removed. If an assembly type production mode is adopted, the reinforced concrete wall plate 1-1 connected with the connecting beam 2-1, the self-resetting short support 4-4 and the foundation beam 1-3 can be prefabricated in a factory respectively and then transported to a site for positioning and installation.
Under a normal use state, the shear wall bears the vertical load and the smaller horizontal load of the structure, the axial pressure and the horizontal shear borne by the upper reinforced concrete wallboard 1-1 act on the connecting beam 2-1 through the concrete, the reinforcing mesh and the shear key 2-5, and the axial force and the shear force of the shear wall are transmitted to the foundation beam 3-1 through the foundation beam hinged joint 2-2. The self-resetting short supports 4-4 on two sides and the connecting ends of the connecting beams 2-1 and the foundation beams 1-3 form a self-resetting wall bottom 1-2 with a bilinear hysteresis characteristic. Bending moment in the reinforced concrete wallboard 1-1 acts on the connecting beam 2-1 through the connecting interface, the connecting beam 2-1 rotates around the hinged joint 2-2 of the foundation beam to a certain degree, axial force acts on the self-reset short supports 4-4 on two sides of the bottom of the wall respectively, the self-reset short supports 4-4 deform to generate resistance, and a bending force couple is formed to bear the bending moment acting on the reinforced concrete wallboard 1-1. The self-resetting short support 4-4 acts the borne bending moment on the foundation beam 1-3 and transmits the bending moment to the foundation beam 1-3.
When the structure is subjected to earthquake load, horizontal load in the wall is increased, lateral deformation is increased, and internal force transmitted from the upper reinforced concrete wallboard 1-1 to the self-resetting wall bottom 1-2 is increased. The internal axial force and the horizontal shearing force of the reinforced concrete wallboard 1-1 are transmitted to the foundation beam 1-3 through the foundation beam hinged joint 2-2. The deformation of the connecting beam 2-1 is increased by rotating around the hinge, the axial deformation of the self-resetting short supports 4-4 on two sides of the wall bottom is increased, the output of the self-resetting short supports 4-4 is increased, the self-resetting short supports 4-4 are in a first rigidity stage, and the self-resetting wall bottom 1-2 is in a first rotating rigidity stage, so that the lateral rotation of the wall body is effectively resisted. The horizontal load continues to increase, the lateral deformation of the wall continues to increase, the rotation amplitude of the self-resetting wall bottom 1-2 around the foundation beam hinged joint 2-2 is increased, the axial deformation of the self-resetting short supports 4-4 on the two sides is increased, when the axial pulling pressure of the self-resetting short supports 4-4 reaches the pre-pressure of the disc springs 4-5, the inner pipe 4-2 and the outer pipe 4-1 start to dislocate, the self-resetting short supports 4-4 enter a second rigidity stage, the self-resetting wall bottom 1-2 enters the second rigidity stage, the self-resetting wall bottom 1-2 reaches a yield point, and the rigidity of the shear wall is reduced. When the lateral displacement of the wall body continues to increase, the increase of the bending moment born by the self-resetting wall bottom 1-2 is not obvious, so that the internal force of the upper concrete reinforced concrete wall plate 1-1 is not increased suddenly, the concrete is not subjected to obvious plastic deformation to generate damage, and the overall damage level of the wall body is low. When the horizontal load is weakened, the self-resetting wall bottom 1-2 restores to deform under the action of the elastic restoring force of the self-resetting short supports 4-4 on the two sides, the restoring force is given to the upper reinforced concrete wallboard 1-1, the wall body is driven to restore to the initial position, no residual deformation is generated, and the wall body is reset.
Those not described in detail in this specification are within the skill of the art.
Claims (3)
1. A bottom hinged low-damage self-resetting shear wall, comprising: the self-resetting wall comprises reinforced concrete wallboards (1-1), self-resetting wall bottoms (1-2) and foundation beams (1-3);
the reinforced concrete wallboard (1-1) is connected with the upper end of the self-resetting wall bottom (1-2), and the foundation beam (1-3) is connected with the lower end of the self-resetting wall bottom (1-2);
the reinforced concrete wallboard (1-1) is designed according to the current specification, and is manufactured by binding a reinforcing mesh and then pouring concrete, wherein the reinforced concrete wallboard (1-1) comprises an edge constraint component and a non-constraint area, vertical stress reinforcing steel bars and dense stirrups are arranged in the edge constraint component, and vertical stress reinforcing steel bars and horizontal distribution reinforcing steel bars are arranged in the non-constraint area;
the middle part of the upper surface of the foundation beam (1-3) is provided with a connecting plate, the connecting plate is provided with a connecting beam hinged joint (3-2), and two sides of the connecting beam hinged joint (3-2) are respectively provided with a self-resetting short support hinged joint II (3-3);
the self-resetting wall bottom (1-2) comprises: a connecting beam (2-1) and two self-resetting short supports (4-4);
the upper surface of the connecting beam (2-1) is provided with a plurality of shear keys (2-5), the middle part of the lower surface is provided with a foundation beam hinged joint (2-2), and the two ends of the lower surface are respectively provided with a self-resetting short support hinged joint I (2-3) at the position corresponding to the two self-resetting short support hinged joints II (3-3);
the self-resetting short support (4-4) comprises an inner pipe (4-2), an outer pipe (4-1), a disc spring (4-5) and a baffle (4-3); the disc spring (4-5) is arranged in the outer pipe (4-1), two ends of the disc spring (4-5) are respectively provided with a baffle (4-3), the inner pipe (4-2) penetrates through an inner hole of the disc spring (4-5) and the baffles (4-3) at two ends and is capped at two ends of the inner pipe (4-2) through a baffle, and two ends of the self-resetting short support (4-4) are provided with a self-resetting short support hinged joint III (4-6);
the self-resetting short support hinged joints III (4-6) at one ends of the two self-resetting short supports (4-4) are respectively hinged with the self-resetting short support hinged joints I (2-3) at two ends of the connecting beam (2-1), and the self-resetting short support hinged joints III (4-6) at the other ends of the two self-resetting short supports (4-4) are respectively hinged with the two self-resetting short support hinged joints II (3-3) on the foundation beam (1-3);
the foundation beam hinged joint (2-2) is hinged with the connecting beam hinged joint (3-2);
the upper surface of the connecting beam (2-1) is in contact with the reinforced concrete wallboard (1-1), the shear keys (2-5) are embedded in the reinforced concrete wallboard (1-1), and the ends of the horizontal distribution ribs and the vertical stress reinforcing steel bars in the reinforced concrete wallboard (1-1) are welded on the upper surface of the connecting beam (2-1);
the connecting beam (2-1) is horizontal or V-shaped, and the bottom shape of the reinforced concrete wallboard (1-1) is poured into the horizontal or V-shaped according to the shape of the connecting beam (2-1);
the concrete strength grade of the reinforced concrete wallboard (1-1) is not lower than C30, the stressed steel bar is not lower than HRB335, and the stirrup is not lower than HPB 300;
the connecting beam (2-1) is made of Q235 grade B, C, D carbon structural steel; the foundation beams (1-3) are made of Q345 grade B, C, D, E low-alloy high-strength structural steel.
2. The bottom-hinged low-damage self-resetting shear wall of claim 1, characterized in that the inner pipe (4-2) and the outer pipe (4-1) of the self-resetting short strut (4-4) are made of common carbon structural steel Q235 steel; the disc spring (4-5) is made of hot-rolled spring steel with the grade of 60CrMnA, and the baffle (4-3) is made of low-alloy high-strength structural steel Q345 steel.
3. The bottom-hinged low-damage self-resetting shear wall of claim 1, characterized in that a damper is arranged between the connecting beam (2-1) and the foundation beam (1-3) of the self-resetting wall bottom (1-2) and is arranged as a self-resetting energy-consuming wall bottom.
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| CN110552438A (en) * | 2019-07-25 | 2019-12-10 | 宁波工程学院 | energy dissipation coupling beam device with self-resetting capability and shear wall structure |
| CN110552439B (en) * | 2019-07-25 | 2021-08-24 | 宁波工程学院 | One-way energy consumption device with self-resetting capability and shear wall |
| CN111636561B (en) * | 2020-04-27 | 2021-07-23 | 北京交通大学 | Plug-in type modular steel structure connecting node with reset function |
| CN112814195B (en) * | 2021-01-05 | 2022-02-01 | 北京交通大学 | Self-resetting reinforced concrete shear wall based on viscoelastic energy consumption |
| CN113235771B (en) * | 2021-05-26 | 2022-08-26 | 华能秦煤瑞金发电有限责任公司 | Easily repaired assembled shear wall |
| CN113530331B (en) * | 2021-07-19 | 2022-08-26 | 重庆大学 | Self-reset module, frame structure with self-reset module and assembling method |
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