Self-resetting shear wall with high deformability and controllable rigidity after yield and working method

Abstract

The invention discloses a self-resetting shear wall with high deformability and controllable rigidity after yield and a working method, and belongs to the technical field of building energy consumption and earthquake resistance, the self-resetting shear wall comprises a shear wall body, the bottom of the shear wall body is connected with a foundation, an energy consumption device is arranged between the foot of the shear wall body and the foundation, and a self-resetting device is arranged in the shear wall body in a penetrating manner; the self-resetting device comprises a prestressed rib material, a first anchorage device is arranged at the top of the prestressed rib material, and a combined disc spring is arranged between the first anchorage device and the top of the shear wall body. The shear wall can be used as a high-ductility shear wall, or a self-resetting shear wall is formed by applying prestress to the prestressed ribs.

Description

Technical Field

[0001] The invention belongs to the technical field of energy dissipation and earthquake resistance of buildings, and specifically relates to a self-resetting shear wall with high deformation capacity and controllable post-yield stiffness and a working method. Background Art

[0002] The statements herein merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] At present, shear wall structures have been widely used in high-rise buildings due to their wide applicability and good seismic performance.

[0004] The self-resetting shear wall based on prestressed technology has small residual deformation and strong damage control ability. It is an effective means to improve the seismic performance of building structures and achieve post-earthquake functional recovery. The traditional prestressed self-resetting shear wall mainly includes an energy dissipation system and a prestressed system. Under the action of an earthquake, the energy dissipation components yield and dissipate energy, and the prestressed tendons act as a self-resetting system to eliminate residual deformation. However, the inventors found that this method has the following problems: (1) The traditional self-resetting shear wall achieves complete self-resetting by high tensioning of the prestressed tendons. The high prestressed reset requirement leads to insufficient elastic deformation reserve of the reset system. Once the prestressed tendons yield and break, it can lead to the degradation of structural stiffness and strength under the main shock and aftershocks, increasing the risk of damage and collapse of the self-resetting structure. (2) Under the action of an earthquake, when the energy dissipation components in the self-resetting shear wall yield, the lateral stiffness of the structure is significantly reduced, making it difficult to meet the stiffness requirements under a large earthquake, making its lateral deformation mode susceptible to the adverse effects of high-order modal effects. Summary of the invention

[0005] In view of the shortcomings of the prior art, the purpose of the present invention is to provide a self-resetting shear wall with high deformation capacity and controllable stiffness after yielding and a working method. The self-resetting shear wall can achieve seismic energy dissipation at different stages and different earthquake intensities through the mutual cooperation of an energy dissipation device and a self-resetting device, thereby improving the bearing capacity of the structure.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In the first aspect, the present invention provides a self-resetting shear wall with high deformation capacity and controllable post-yield stiffness, including a shear wall body, the bottom of the shear wall body is connected to a foundation, an energy absorption device is arranged between the foot of the shear wall body and the foundation, and a self-resetting device is arranged through the inside of the shear wall body; the self-resetting device includes prestressed reinforcement, the prestressed reinforcement is vertically arranged along the height direction of the wall body, the bottom of the prestressed reinforcement passes through the shear wall body and is anchored to the bottom surface of the foundation, the top of the prestressed reinforcement passes through the shear wall body and is anchored by a first anchor, and a combined disc spring is arranged between the first anchor and the top of the shear wall body.

[0008] As a further technical solution, a second anchor is provided at the bottom of the prestressed reinforcement, and the second anchor is used to anchor the prestressed reinforcement in the foundation.

[0009] As a further technical solution, it also includes a guide tube, which is T-shaped. The top horizontal part of the guide tube is located on the top of the combined disc spring, and the vertical part passes through the inside of the combined disc spring. The bottom of the combined disc spring is in contact with the shear wall body, and the prestressed reinforcement passes through the guide tube and is anchored by the first anchor.

[0010] As a further technical solution, the shear wall body and the foundation are both provided with vertical through holes, and the prestressed reinforcement passes through the vertical through holes of the shear wall body and the foundation.

[0011] As a further technical solution, a plurality of the self-resetting devices are provided, and the plurality of self-resetting devices are evenly distributed in the width direction of the shear wall.

[0012] As a further technical solution, the prestressed reinforcement is applied with prestress.

[0013] As a further technical solution, a first groove is provided at the top of the shear wall body for installing the disc spring and the first anchor; a second groove is provided at the side of the bottom of the shear wall body for installing the energy dissipation device.

[0014] As a further technical solution, the second grooves are symmetrically arranged on the sides of the bottom of the shear wall.

[0015] As a further technical solution, when one self-resetting device is provided, the prestressed reinforcement is passed through the center of the shear wall.

[0016] In a second aspect, the present invention further provides a method for operating the self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as described above, comprising the following steps:

[0017] Under the action of small earthquakes, the self-resetting shear wall is in the elastic deformation stage. Under the action of prestress, the bottom surface of the wall is close to the top surface of the foundation, and the lateral stiffness is the same as that of the traditional cast-in-place reinforced concrete shear wall. At this time, the lateral stiffness of the shear wall is the largest;

[0018] The yielding of shear walls can be divided into two stages:

[0019] In the first stage, under the action of moderate and large earthquakes, a gap opens between the shear wall and the foundation contact surface, the energy-absorbing components yield and dissipate energy, and the prestressed system eliminates residual deformation. The lateral stiffness in this stage is controlled by the combined disc spring-prestressed tendon series self-reset device (the stiffness is the smallest in this stage), and the deformation capacity in this stage is the superposition of the deformation contributions of the combined disc spring and the high-strength prestressed tendons. In the second stage, under the action of extremely large earthquakes, the combined disc springs are flattened, and the lateral stiffness in this stage is provided by the prestressed tendons (the stiffness is moderate in this stage), and the deformation capacity in this stage is determined by the residual elastic deformation capacity of the high-strength prestressed tendons.

[0020] The beneficial effects of the present invention are as follows:

[0021] The self-resetting shear wall with high deformation capacity and controllable stiffness after yielding of the present invention, under the action of moderate and large earthquakes, yields and dissipates energy through the energy-absorbing structure at the foot of the shear wall, and the lateral stiffness is provided by the self-resetting device of the combined disc spring-prestressed tendon in series, and the combined disc spring and the prestressed tendon jointly provide sufficient lateral deformation capacity; under the action of extremely large earthquakes, the combined disc spring is flattened, and the high-strength prestressed tendons continue to provide lateral stiffness and deformation capacity, thus forming a self-resetting shear wall with high deformation capacity and controllable stiffness after yielding.

[0022] The high deformation capacity post-yield stiffness controllable self-resetting shear wall of the present invention, on the one hand, utilizes different series and parallel connection modes of disc springs to change the stiffness of the combined disc springs, and then changes the stiffness of the combined disc spring-prestressed tendon series self-resetting device, thereby controlling and designing the lateral stiffness of the wall after the energy-absorbing structure yields, and reducing the influence of high-order modes; on the other hand, by changing the number of disc springs in series, the deformation capacity of the combined disc springs is controlled, thereby greatly improving the deformation capacity of the self-resetting system (combined disc spring-prestressed tendon series self-resetting device).

[0023] The high deformation capacity post-yield stiffness controllable self-resetting shear wall of the present invention is designed to flatten the combined disc springs when the energy-absorbing structure suffers large plastic deformation and faces a high risk of fatigue fracture. At this time, the high-strength prestressed reinforcement provides lateral stiffness. Once fatigue fracture occurs in the energy-absorbing structure, the high-strength prestressed reinforcement can provide greater lateral stiffness, which can prevent the sudden reduction of the structural bearing capacity caused by the sudden fracture of the energy-absorbing device. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0025] Figure 1 is a schematic diagram of a self-resetting shear wall with high deformation capacity and controllable post-yield stiffness according to one or more embodiments of the present invention;

[0026] Figure 2 It is a schematic diagram of the assembly state of the self-resetting device;

[0027] Figure 3 is a schematic diagram of the guide tube;

[0028] Figure 4 is a schematic diagram of the pad;

[0029] Figure 5 is a schematic diagram of the anchor;

[0030] Figure 6 It is a schematic diagram of the stress at different stages of a self-resetting shear wall with high deformation capacity and controllable post-yield stiffness according to one or more embodiments of the present invention;

[0031] In the figure: the distances or sizes between parts are exaggerated to show the positions of the parts, and the schematic diagram is for illustration only;

[0032] Among them, 1 is a shear wall, 2 is a foundation, 3 is an energy dissipation device, 4 is a self-resetting device, 41 is a prestressed tendon, 42 is an anchor, 43 is a combined disc spring, 44 is a guide tube, and 45 is a pad; DETAILED DESCRIPTION

[0033] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0034] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0035] For the convenience of description, if the words "up", "down", "left" and "right" appear in the present invention, they only indicate that they are consistent with the up, down, left and right directions of the drawings themselves, and do not limit the structure. They are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0036] Terminology explanation section: The terms "install", "connected", "connect", "fixed", etc. that appear in the present invention should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can be an internal connection between two elements, or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0037] In a typical embodiment of the present invention, Figure 1 As shown, a self-resetting shear wall with high deformation capacity and controllable post-yield stiffness is proposed, which includes a shear wall body 1, the bottom of the shear wall body 1 is connected to a foundation 2, an energy dissipation device 3 is arranged between the foot of the shear wall body 1 and the foundation 2, and a self-resetting device 4 is arranged inside the shear wall body 1. The foundation 2 can be a concrete foundation. Through the cooperation of the energy dissipation device and the self-resetting device, seismic energy dissipation under different earthquake magnitudes and intensities at different stages can be achieved, thereby improving the structural bearing capacity.

[0038] The shear wall 1 is an inverted convex structure, and a small groove is set on the top of the shear wall 1 for installing the anchor 42, the combined disc spring 43, the guide tube 44 and the pad 45 in the self-resetting device 4; a large groove is set on the side of the bottom of the shear wall 1 for installing the energy dissipation device 3, such as Figure 1 As shown, a groove is set at the left position of the bottom of the shear wall body 1, and an energy dissipation device 3 is installed in the groove. A groove is set at the right position of the bottom of the shear wall body 1, and an energy dissipation device 3 is installed in the groove. In order to ensure the uniform force of the entire wall body, the two energy dissipation devices 3 are symmetrically arranged relative to the shear wall body 1; the raised part of the shear wall body 1 between the two grooves is fixedly connected to the foundation 2.

[0039] Furthermore, the energy dissipation device 3 is a metal energy dissipation component, which may be a metal yield type energy dissipation component, such as a buckling restrained support, or a friction type energy dissipation component, etc., which is not limited here.

[0040] Specifically, Figure 2As shown, the self-resetting device 4 includes a prestressed reinforcement 41, an anchor 42, a combined disc spring 43, a guide tube 44 and a pad 45, wherein the prestressed reinforcement 41 is arranged vertically, the bottom of the prestressed reinforcement 41 passes through the shear wall 1 and extends into the wall 2 and is anchored, the top of the prestressed reinforcement 41 passes through the shear wall 1, an anchor 42 is arranged on the top of the prestressed reinforcement 41, and the anchor is anchored by the anchor 42, and a combined disc spring 43 is arranged between the anchor 42 and the top of the shear wall 1; specifically, a pad 45 is arranged on the top of the shear wall 1, and the combined disc spring 43 is arranged The bottom is in contact with the pad 45, and a guide tube 44 is set on the top of the combined disc spring 43. The prestressed reinforcement passes through the guide tube 44 and is anchored by the anchor 42. The guide tube 44 is mainly used to guide and direct the prestressed reinforcement 41. The present invention is designed to flatten the combined disc spring when the energy-absorbing structure suffers from large plastic deformation and faces a high risk of fatigue fracture. At this time, the high-strength prestressed reinforcement provides lateral stiffness. Once fatigue fracture occurs in the energy-absorbing structure, the high-strength prestressed reinforcement can provide greater lateral stiffness, which can prevent the sudden reduction of the structural bearing capacity caused by the sudden fracture of the energy-absorbing device.

[0041] Further, such as Figure 3 As shown, the guide tube 44 is T-shaped, the top horizontal part of the guide tube is located at the top of the combined disc spring, the vertical part passes through the inside of the combined disc spring, the bottom of the combined disc spring is in contact with the shear wall, and the prestressed reinforcement passes through the guide tube and is anchored by the first anchor.

[0042] Furthermore, it should be noted that the deformation capacity and lateral stiffness of the wall after the metal energy-absorbing component yields can be controlled and designed by adjusting the elasticity of the combined disc spring 43 and the series and parallel connection mode and quantity. That is, the self-resetting shear wall with high deformation capacity and controllable stiffness after yielding of the present invention, on the one hand, uses different series and parallel connection modes of disc springs to change the stiffness of the combined disc spring 43, and then changes the stiffness of the combined disc spring-high-strength prestressed reinforcement assembly, so as to control the lateral stiffness of the wall after the energy-absorbing structure yields and reduce the influence of high-order modes; on the other hand, the deformation capacity of the combined disc spring can be controlled by changing the series number of disc springs, thereby greatly improving the deformation capacity of the self-resetting system (combined disc spring-high-strength prestressed reinforcement assembly).

[0043] Furthermore, an anchor (not shown in the figure) is also provided at the bottom of the prestressed reinforcement 41 to anchor the prestressed reinforcement.

[0044] Furthermore, the prestressed reinforcement 41 passes through the shear wall body 1 and the foundation 2 from top to bottom, and both the shear wall body 1 and the foundation 2 are provided with vertical through holes, and the prestressed reinforcement 41 passes through the vertical through holes of the shear wall body 1 and the foundation 2.

[0045] Furthermore, an anchor 42 is fixedly arranged at the part of the prestressed reinforcement 41 passing through the top of the shear wall body 1 , and a gap is provided between the anchor 42 and the top of the shear wall body 1 , and a combined disc spring 43 is arranged in the gap.

[0046] Furthermore, one or more self-resetting devices 4 can be provided. When one self-resetting device 4 is provided, the prestressed tendons 41 of the self-resetting device 4 are inserted into the vertical through hole in the middle of the shear wall body. When multiple self-resetting devices 4 are provided, the prestressed tendons 41 of the multiple self-resetting devices 4 are evenly arranged in the width direction of the shear wall body 1. In this embodiment, one prestressed tendon 41 is provided, and one prestressed tendon 41 is inserted into the vertical through hole in the middle of the shear wall body. When multiple self-resetting devices 4 are provided, multiple evenly arranged prestressed tendons can further improve the overall seismic performance of the shear wall.

[0047] The high deformation capacity and controllable post-yield stiffness self-resetting shear wall provided in this embodiment has the energy-absorbing structure at the foot of the shear wall yield and dissipate energy under the action of moderate and large earthquakes, and the lateral stiffness is provided by the combined disc spring-high-strength prestressed reinforcement series assembly, and the combined disc spring and high-strength prestressed reinforcement jointly provide sufficient lateral deformation capacity; under the action of extremely large earthquakes, the combined disc spring is flattened, and the high-strength prestressed reinforcement continues to provide lateral stiffness and deformation capacity, forming a high deformation capacity and controllable post-yield stiffness self-resetting shear wall.

[0048] Specifically, the working principle or working method of the shear wall is as follows:

[0049] Under the action of small earthquakes, the shear wall is in the elastic deformation stage, and the lateral stiffness is controlled by the energy dissipation device and the combined disc spring. At this time, the lateral stiffness of the shear wall is the largest.

[0050] The energy dissipation yield of the shear wall is divided into two stages:

[0051] In the first stage, under the action of moderate and large earthquakes, the energy-absorbing device at the foot of the shear wall yields and dissipates energy, the combined disc springs are compressed and deformed, and the lateral stiffness is controlled by the combined disc springs. At this time, the lateral stiffness of the shear wall is the smallest; in the second stage, under the action of extremely large earthquakes, the combined disc springs are flattened, the prestressed reinforcement is activated, and the lateral stiffness of the structure is controlled by the prestressed reinforcement. At this time, the lateral stiffness of the shear wall is centered.

[0052] In the first stage mentioned above, different series and parallel connection modes of disc springs can be used to change the stiffness of the combined disc springs, thereby controlling the lateral stiffness of the wall after the metal energy-absorbing components yield and reducing the influence of high-order modes.

[0053] In the second stage mentioned above, when the energy dissipation device suffers from large plastic deformation and faces a high risk of fatigue fracture, the combined disc spring is designed to be flattened and the prestressed reinforcement is activated; on the one hand, the significant improvement in the lateral stiffness of the structure can reduce the lateral deformation of the structure, thereby reducing the plastic strain of the energy dissipation device and delaying the occurrence of fatigue fracture; on the other hand, once the energy dissipation device suffers from fatigue fracture, the prestressed reinforcement will replace the energy dissipation device to provide lateral resistance, preventing the sudden reduction of the structural bearing capacity caused by the sudden fracture of the energy dissipation device, and playing the role of a second line of defense in the earthquake resistance process, controlling the deformation of the wall and protecting the wall from damage.

[0054] In this embodiment, the shear wall is a high-ductility shear wall, and the overall ductility and energy absorption capacity of the structure are relatively high.

[0055] In other embodiments, prestress is applied to the prestressed reinforcement 41 to form a self-resetting shear wall. Compared with other self-resetting shear walls, the self-resetting deformation range of the self-resetting shear wall can be doubled due to the cooperation of the prestressed reinforcement and the combined disc springs.

[0056] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A self-resetting shear wall with high deformation capacity and controllable post-yield stiffness, characterized in that: It includes a shear wall body, the bottom of the shear wall body is connected to the foundation, an energy-absorbing device is arranged between the foot of the shear wall body and the foundation, and a self-resetting device is arranged through the inside of the shear wall body; the self-resetting device includes prestressed reinforcement, the prestressed reinforcement is arranged vertically along the height direction of the wall body, the bottom of the prestressed reinforcement passes through the shear wall body and is anchored in the foundation, the top of the prestressed reinforcement passes through the shear wall body and is anchored by a first anchor, and a combined disc spring is arranged between the first anchor and the top of the shear wall body.

2. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 1, characterized in that: A second anchor is arranged at the bottom of the prestressed reinforcement, and the second anchor is used to anchor the prestressed reinforcement in the foundation.

3. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 2, characterized in that: It also includes a guide tube, which is T-shaped. The top horizontal part of the guide tube is located on the top of the combined disc spring, and the vertical part passes through the inside of the combined disc spring. The bottom of the combined disc spring is in contact with the shear wall, and the prestressed reinforcement passes through the guide tube and is anchored by the first anchor.

4. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 1, characterized in that: The shear wall body and the foundation are both provided with vertical through holes, and the prestressed reinforcement passes through the vertical through holes of the shear wall body and the foundation.

5. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 1, characterized in that: The self-resetting devices are arranged in plurality, and the plurality of self-resetting devices are evenly distributed in the width direction of the shear wall.

6. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 1, characterized in that: The prestressed reinforcement is applied with prestress.

7. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 1, characterized in that: A first groove is arranged at the top of the shear wall body for installing the disc spring and the first anchor; a second groove is arranged at the side position of the bottom of the shear wall body for installing the energy dissipation device.

8. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 7, characterized in that: The second grooves are symmetrically arranged at the sides of the bottom of the shear wall.

9. The self-resetting shear wall with high deformation capacity and controllable post-yield stiffness as claimed in claim 1, characterized in that: When one self-resetting device is provided, the prestressed reinforcement is passed through the center of the shear wall.

10. The working method of the self-resetting shear wall with high deformation capacity and controllable post-yield stiffness according to any one of claims 1 to 9, characterized in that: The following steps are involved: Under the action of small earthquakes, the self-resetting shear wall is in the elastic deformation stage. Under the action of prestress, the bottom surface of the wall is close to the top surface of the foundation, and the lateral stiffness is the same as that of the traditional cast-in-place reinforced concrete shear wall. At this time, the lateral stiffness of the shear wall is the largest; the yielding of the shear wall is divided into two stages: in the first stage, under the action of moderate and large earthquakes, a gap is opened between the shear wall and the contact surface of the foundation, the energy-absorbing components yield and dissipate energy, and the prestressed system eliminates residual deformation. The lateral stiffness in this stage is controlled by the combined disc spring-high-strength prestressed reinforcement series assembly, and the deformation capacity in this stage is the superposition of the deformation contributions of the combined disc spring and the high-strength prestressed reinforcement; in the second stage, under the action of extremely large earthquakes, the combined disc spring is flattened, and the lateral stiffness in this stage is provided by the high-strength prestressed reinforcement, and the deformation capacity in this stage is determined by the residual elastic deformation capacity of the high-strength prestressed reinforcement.

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