Composite damper mounted at bottom of anti-seismic wall

Abstract

The invention discloses a composite damper installed at the bottom of an anti-seismic wall. The composite damper comprises a U-shaped steel plate, an outer covering plate, a limiting plate, a steel base plate, a lower bottom plate, a friction main plate and a brass plate. The composite damper has the characteristics of stiffness hardening behavior after yield, multi-stage energy consumption and the like. The damper is simple in structure and convenient to manufacture, install and replace after earthquake damage, the anti-seismic capacity of an engineering structure is remarkably improved, and the function requirement for the multi-stage anti-seismic performance target can be met.

Description

Technical Field

[0001] The invention relates to a composite damper installed at the bottom of an earthquake-resistant wall, belonging to the technical field of earthquake-resistant engineering structures. Background Art

[0002] Earthquake resistance is a key issue in the design and construction of building structures. Seismic isolation and shock absorption technology can greatly reduce the damage to engineering structures when an earthquake occurs. Dampers are important devices in structural energy dissipation design. Currently, most dampers are dampers with a single energy dissipation mechanism. Taking the hysteresis damper as an example, although the damper can provide a large initial stiffness for the structure, when the damper is activated, the stiffness drops sharply, which will cause a sudden change in the stiffness of the structure and form an unfavorable failure mechanism in the weak floors, which fails to meet the requirements of the overall seismic performance of the structure.

[0003] The damper of the present invention is a damping energy dissipation device that can provide composite energy dissipation of friction energy dissipation and soft steel bending buckling energy dissipation. This damper has the characteristics of post-yield stiffness hardening behavior and multi-stage energy dissipation. The post-yield stiffness hardening behavior has a certain compensation effect on the stiffness of the main structure layer, and can improve the shortcoming of insufficient post-yield stiffness of the hysteresis damper. The characteristics of multi-stage energy dissipation are reflected in: when a small earthquake occurs, the friction damper plays a major role, and the damper dissipates seismic energy without obvious damage. When a medium earthquake or a large earthquake with a larger destructive effect occurs, the friction damper and the "U" metal damper work together in a strong earthquake, which can greatly improve the dissipation of seismic energy. The damper of the present invention is small in size and can be installed in large quantities at the bottom of the seismic wall of a house. The damper damaged after the earthquake can continue to be used after replacement or component repair, achieving good structural safety and economy. Summary of the invention

[0004] The purpose of the present invention is to provide a composite damper installed at the bottom of an earthquake-resistant wall in view of the defects of the existing hysteresis damper.

[0005] To achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a composite damper installed at the bottom of an earthquake-resistant wall, characterized in that the composite damper is composed of seven components: a U-shaped steel plate (1), an outer covering plate (2), a limit plate (3), a steel pad (4), a lower base plate (5), a friction main plate (6) and a brass plate (7), and each component is connected into one at the bolt holes reserved in the component by high-strength bolts.

[0006] The U-shaped steel plate (1) is made of a steel plate with a yield strength not higher than 235 MPa. The steel plate is chamfered and bent at 180° to form a "U" shape. Circular holes are provided on the straight sections on both sides of the U-shaped steel plate (1). The U-shaped steel plate (1) is connected to the limit plate (3) and the outer cover plate (2) by high-strength bolts.

[0007] The outer cover plate (2) has three holes on its surface, one of which is connected to the steel backing plate by a high-strength bolt, and the other two holes are used to fix the U-shaped steel plate (1), the brass plate (7) and the friction main plate (6) by high-strength bolts.

[0008] The brass plate (7) is provided with two circular holes at the same positions as the holes of the outer cover plate (2), and the friction main plate (6) is provided with a rectangular hole. The size characteristics of the rectangular hole are as follows: the width of the rectangular hole is the same as the diameter of the circular hole on the brass plate (7), and the length of the rectangular hole is the center distance between the two circular holes on the brass plate (7) plus 100 mm.

[0009] The limiting plate (3) is provided with three holes through which the bolt rods can pass, two of which are used to connect with the bolts of the U-shaped steel plate (1), and the remaining hole is used to connect with the bolts of the lower base plate (5).

[0010] The brass plate (7) is made of brass and has a thickness of 3 to 6 mm.

[0011] The beneficial effects of the present invention are embodied in:

[0012] (1) The composite damper has a small volume and high energy consumption efficiency, and can be flexibly arranged at the lower part of the seismic wall according to the energy consumption requirements of the wall structure.

[0013] (2) The two energy dissipation devices, namely the friction plate and the semicircularly curved U-shaped steel plate, provided in the composite damper can realize friction energy dissipation and steel bending energy dissipation, and thus can dissipate the input earthquake energy more efficiently, thereby reducing the damage caused by the earthquake to the house.

[0014] (3) The two energy dissipation devices, the friction plate and the U-shaped steel plate, in the composite damper can achieve a two-stage seismic energy dissipation effect: when the building encounters a small earthquake or strong wind, the friction damper is activated and the damper dissipates the seismic energy without obvious damage; when a moderate or large earthquake with a more destructive effect occurs, the friction damper and the "U" metal damper work together to significantly improve the dissipation of seismic energy.

[0015] (4) The various components of the composite damper are connected by high-strength bolts, which ensures the continuity of energy consumption during strong earthquakes. Even if large deformation occurs, it can still provide the necessary axial force for the wall, avoiding the problem of significant reduction in wall stiffness due to the installation of the damper.

[0016] (5) The damper is connected to the wall with bolts, which is easy to disassemble and repair, and has good overall economic efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall front view of the present invention;

[0018] Figure 2 It is an overall isometric view of the present invention;

[0019] Figure 3 It is an isometric side view of the U-shaped steel plate in the present invention;

[0020] Figure 4 is an isometric view of an outer covering plate of the present invention;

[0021] Figure 5 It is an isometric view of the limiting plate in the present invention;

[0022] Figure 6 It is an isometric view of the steel backing plate in the present invention;

[0023] Figure 7 It is an isometric view of the friction main plate in the present invention;

[0024] Figure 8 It is an isometric view of the brass plate in the present invention.

[0025] Legend: 1. U-shaped steel plate; 2. Outer covering plate; 3. Limiting plate; 4. Steel pad; 5. Lower base plate; 6. Friction main plate; 7. Brass plate. DETAILED DESCRIPTION

[0026] The present invention is further explained below through specific embodiments in conjunction with the accompanying drawings.

[0027] As shown, the present invention is a composite damper installed at the bottom of an earthquake-resistant wall. The composite damper is composed of a U-shaped steel plate (1), an outer covering plate (2), a limit plate (3), a steel pad (4), a lower bottom plate (5), a friction main plate (6) and a brass plate (7). The various components are connected into one piece at the bolt holes reserved in the components by high-strength bolts:

[0028] The U-shaped steel plate (1) is made of mild steel plate and has a characteristic "U" shape. Symmetrical circular holes are opened on both sides of the U-shaped steel plate (1) and are connected to the limit plate (3) and the outer cover plate (2) by high-strength bolts.

[0029] The outer cover plate (2) has three holes on its surface, the upper hole is fixedly connected to the steel backing plate (4) by means of high-strength bolts, and the lower two holes are fixedly connected to the U-shaped steel plate (1) by means of high-strength bolts applying a pre-tightening force;

[0030] The brass plate (7) is provided with a circular hole at the same position as the hole of the outer cover plate (2), the size of the circular hole matches the insertion of the bolt rod, and the friction main plate (6) is provided with a rectangular hole, so that during an earthquake, the bolts on the outer cover plate (2) can drive the brass plate (7) and the friction main plate (6) to produce a reciprocating relative displacement, thereby realizing friction energy consumption;

[0031] The limiting plate (3) has two vertical holes connected to the U-shaped steel plate (1) by bolts, and has a hole at the bottom connected to the lower bottom plate (5) by bolts. Ribs are arranged on both sides of the limiting plate (3) to enhance the deformation resistance of the limiting plate (3).

[0032] The steps of assembling and installing the present invention are as follows:

[0033] 1. Place two brass plates (7) on both sides of the friction main plate (6), place two outer covering plates (2) close to the two brass plates (7), place two U-shaped steel plates (1) outside the two outer covering plates (2), and sandwich the steel pad (4) between the two outer covering plates (2). After all components are aligned, high-strength bolts are passed through the reserved holes on each component, and the bolts are tightened to connect the components into one.

[0034] 2. The two limit plates (3) are respectively connected to the U-shaped steel plate (1) with bolts, and the bottoms of the two limit plates (3) are connected to the lower bottom plate (5) with bolts. All bolts are tightened to a predetermined prestress, and the damper is assembled.

[0035] 3. The assembled upper steel pad (4) and lower base plate (5) of the damper are respectively welded to the embedded steel parts at the corresponding positions of the seismic wall where the damper needs to be installed, so as to complete the installation of the damper on the wall. When an earthquake occurs, the bottom of the seismic wall is displaced, and the steel pad (4) drives the outer cover plate (2) to move up and down, so that the brass plate (7) and the friction main plate (6) connected to the outer cover plate (2) are relatively displaced. At this time, the brass plate (7) and the friction main plate (6) have sliding friction to consume the seismic energy. When the relative displacement causes the U-shaped steel plate (1) to yield, the U-shaped steel plate (1) dissipates the seismic energy at the same time.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A composite damper installed at the bottom of an earthquake-resistant wall, characterized in that The composite damper is composed of seven components: a U-shaped steel plate (1), an outer covering plate (2), a limiting plate (3), a steel backing plate (4), a lower bottom plate (5), a friction main plate (6), and a brass plate (7).

2. A composite damper installed at the bottom of a seismic wall according to claim 1, characterized in that: The friction main plate (6) and the lower base plate (5) are welded together, and the remaining components are connected together at corresponding reserved bolt holes using a plurality of high-strength bolts.

3. A composite damper installed at the bottom of a seismic wall according to claim 1, characterized in that: The U-shaped steel plate (1) is a straight steel plate bent into a 180° arc in the middle section, and is made of low-carbon alloy steel with a yield strength not higher than 235 MPa. Bolt holes for bolt connection with the limit plate (3) and the outer cover plate (2) are reserved on the straight section of the U-shaped steel plate (1).

4. A composite damper installed at the bottom of a seismic wall according to claim 1, characterized in that: The outer cover plate (2) is provided with three bolt holes, one of which is used for bolt connection with the steel backing plate (4), and the other two bolt holes are used for bolt connection with the U-shaped steel plate (1).

5. The composite damper installed at the bottom of the seismic wall according to claim 1, characterized in that: The brass plate (7) is made of brass and has a thickness of 3 to 6 mm. The brass plate (7) is provided with two circular bolt holes corresponding to the opening positions of the outer cover plate (2).

6. The composite damper installed at the bottom of the seismic wall according to claim 1, characterized in that: The friction main plate (6) is provided with a rectangular hole, the width of which is the same as the diameter of the bolt hole on the brass plate (7), and the length of which is the center distance between the two circular bolt holes on the brass plate (7) plus 100 mm.

7. The composite damper installed at the bottom of a seismic wall according to claim 1, characterized in that: The limiting plate (3) is provided with three bolt holes, two of which are used for bolt connection with the U-shaped steel plate (1), and the remaining hole is used for bolt connection with the lower base plate (5).

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