Double-tube anti-pullout and multi-dimensional shock-absorbing device of seismic isolation support and seismic isolation method thereof

Abstract

The present invention discloses a double-tube pull-out resistance and multi-dimensional shock-absorbing device of a seismic isolation support and a seismic isolation method thereof. The device consists of a rectangular steel box, an upper end plate, a lower end plate, a rectangular inner partition, a viscoelastic energy dissipation unit, a force transmission steel plate, a high-strength steel wire rope and a high-strength bolt. The double-tube pull-out resistance and multi-dimensional shock-absorbing device of the present invention has the characteristics of high energy dissipation, pull-out resistance and large deformation. It is installed on the four sides of the seismic isolation support through high-strength bolts. When a horizontal or vertical earthquake or vibration occurs, the viscoelastic energy dissipation unit inside the device undergoes reciprocating compression deformation, which can consume a large amount of energy and provide the seismic isolation support with multi-directional shock absorption capabilities. At the same time, when the seismic isolation support is subjected to an upward lifting action, the device can provide it with a large pull-out resistance. In addition, the present invention also has the characteristics of convenient installation on the seismic isolation support, and is easy to repair and replace after long-term use and large-scale vibration.

Description

Technical Field

[0001] The invention relates to a seismic isolation technology, in particular to a double-tube anti-pulling and multi-dimensional shock absorbing device of a seismic isolation support and a seismic isolation method thereof. Background Art

[0002] Earthquakes and other harmful vibrations are widely present in nature and in human production and life, and can cause great harm to building structures. Foundation isolation technology is an efficient vibration control method to reduce structural vibration response. Rubber isolation bearings are the most mature type of isolation technology currently. They have been widely used in the field of building isolation and have formed a set of standardized design specifications.

[0003] At present, the function of rubber seismic isolation bearings is still very limited. Its shortcomings are: both the seismic isolation performance and the ability to withstand tension in the vertical direction are poor. However, earthquakes or various vibrations do not only exist in the horizontal direction, but also vertical earthquakes or vibrations account for a large proportion. On the one hand, vertical earthquakes or vibrations will cause serious damage to the building structure, and on the other hand, the building structure will be subject to a large lifting effect, thereby damaging the rubber seismic isolation bearings. In addition, the building structure is prone to overturning under the combination of horizontal and vertical earthquakes or vibrations, which will also cause the rubber seismic isolation bearings to be pulled apart.

[0004] Multi-dimensional seismic isolation technology is a control method that can simultaneously isolate and reduce horizontal and vertical earthquakes or vibrations. The current multi-dimensional seismic isolation devices mostly use a combination of rubber seismic isolation bearings and vertical seismic isolation devices. This approach increases the complexity of the seismic isolation bearings and increases the manufacturing cost. At the same time, due to the increase in the height of the combined seismic isolation bearings and the decrease in vertical stiffness, the overall stability will decrease, further increasing the possibility of overturning of the building structure.

[0005] Setting up an anti-pullout device in the rubber isolation bearing can greatly improve the tensile performance of the bearing, thereby resisting the overturning of the building structure. In addition to the vertical displacement, the horizontal displacement of the bearing will also cause the anti-pullout device to deform. However, due to the height limitation of the rubber isolation bearing, the deformation capacity of the previous anti-pullout device is limited. Under the action of a small earthquake or vibration, it may reach the limit of deformation, thereby inhibiting the horizontal displacement of the rubber isolation bearing, and at the same time it will also be damaged. Therefore, it is difficult to cooperate with the rubber bearing to produce a better control effect under large-amplitude vibration.

[0006] In order to solve the above problems, it is necessary to design a double-tube anti-tensile and multi-dimensional shock-absorbing device for the seismic isolation bearing. On the one hand, it provides multi-directional shock-absorbing performance for the rubber seismic isolation, and on the other hand, it increases the anti-tensile capacity of the rubber seismic isolation bearing during vertical earthquakes or vibrations and overturning of the building structure. At the same time, it will not affect the horizontal deformation performance of the rubber seismic isolation bearing, and give full play to the control effect of the seismic isolation bearing to avoid damage to the building structure under earthquakes or vibrations. Summary of the invention

[0007] The technical problem solved by the present invention is to provide a double-tube anti-pullout and multi-dimensional shock-absorbing device for a seismic isolation bearing. By installing the device in an existing rubber seismic isolation bearing, it can provide multi-directional shock-absorbing performance for the rubber seismic isolation bearing, and enable the rubber seismic isolation bearing to withstand a large tensile force in the vertical direction, thereby preventing the overturning of the building structure. At the same time, the device has a large deformation capacity and will not affect the seismic isolation performance of the rubber seismic isolation bearing in the horizontal direction. In addition, the device also has the characteristics of easy installation on the rubber seismic isolation bearing, and is easy to repair and replace during long-term use and after a strong earthquake.

[0008] In order to solve the above technical problems, the technical means adopted by the present invention are: a double-tube anti-pulling and multi-dimensional shock absorbing device of a seismic isolation support, comprising: a rubber seismic isolation support,

[0009] Threaded holes are respectively provided at corresponding positions of the upper steel plate and the lower steel plate of the rubber seismic isolation support, and multiple groups of multi-directional energy absorbing units are installed between the upper steel plate and the lower steel plate by bolts in cooperation with the threaded holes, and are symmetrically arranged around the core rubber seismic isolation pad of the rubber seismic isolation support, and each group of multi-directional energy absorbing units includes: a rectangular steel box, an upper end plate arranged at the upper end of the rectangular steel box, a lower end plate arranged at the lower end of the rectangular steel box, and a rectangular inner partition plate arranged inside the rectangular steel box, and the rectangular inner partition plate evenly divides the inner cavity of the rectangular steel box into two parts arranged in parallel, namely a first cavity and a second cavity;

[0010] A first viscoelastic energy dissipation unit is provided in the first cavity, and a second viscoelastic energy dissipation unit is provided in the second cavity;

[0011] A first steel wire rope, one end of which penetrates from the lower end plate at one side of the first cavity, passes through the first viscoelastic energy dissipation unit and is fixedly connected to the first force transmission steel plate, the first force transmission steel plate is arranged in the first cavity and is located between the first viscoelastic energy dissipation unit and the upper end plate; the other end of the first steel wire rope extends out of the first cavity and is hinged to the bolt;

[0012] A second steel wire rope, one end of which passes through a side of the second cavity on the upper end plate, passes through the second viscoelastic energy dissipation unit and is fixedly connected to the second force transmission steel plate. The second force transmission steel plate is arranged in the second cavity and between the second viscoelastic energy dissipation unit and the lower end plate; the other end of the second steel wire rope extends out of the second cavity and is hinged to a bolt.

[0013] The first viscoelastic energy dissipation unit and the second viscoelastic energy dissipation unit are both made of high-dissipation viscoelastic materials and are in the shape of a cylinder with a hole in the center.

[0014] The upper end plate and the lower end plate are both rectangular steel plates, which are arranged in parallel at the upper and lower ends of the rectangular steel box, and each end plate is respectively provided with a single-sided circular hole, wherein the circular hole on the upper end plate is located at the center of the first cavity, and the circular hole on the lower end plate is located at the center of the second cavity. At the same time, a circle of rubber gasket is respectively arranged around each circular hole.

[0015] A hole for the first steel wire rope to pass through is provided at the center of the first viscoelastic energy dissipation unit, and a hole for the second steel wire rope to pass through is provided at the center of the second viscoelastic energy dissipation unit; the first force transmission steel plate and the second force transmission steel plate have the same structure, both of which are cylinders with a hole in the center, which are in close contact with the viscoelastic energy dissipation unit, and the force transmission steel plate is processed with holes of two diameters along the thickness direction, wherein, after the steel wire rope passes through the hole of small diameter, an enlarged end is provided at the hole of large diameter to realize the force transmission connection with the force transmission steel plate.

[0016] The first force transmission steel plate is slidably connected to the inner wall of the first cavity; the second force transmission steel plate is slidably connected to the inner wall of the second cavity.

[0017] A seismic isolation method based on the multi-dimensional seismic isolation support, by opening threaded holes uniformly around the core rubber seismic isolation pad on the rubber seismic isolation support, multiple groups of multi-directional energy dissipation units are installed between the upper steel plate and the lower steel plate by bolts, providing the rubber seismic isolation support with multi-directional shock absorption performance and vertical pull-out resistance. When an earthquake or vibration occurs in the horizontal direction, the seismic isolation support undergoes horizontal shear deformation, and the core rubber seismic isolation pad deforms under the shear force to produce a shock-absorbing effect. At the same time, as the deformation of the core rubber seismic isolation pad increases, the device tilts to cause the steel wire rope in the multi-directional energy dissipation unit to generate tension, and the steel wire rope drives the force transmission steel plate to compress the viscoelastic energy dissipation unit in the rectangular steel box, thereby consuming a large amount of earthquake or vibration energy and providing a horizontal vibration reduction effect.

[0018] The maximum deformation that the device can provide is the sum of the deformations of the two viscoelastic energy dissipation units. Since the viscoelastic energy dissipation units are arranged in parallel in the horizontal direction, even if the height of the rubber isolation pad is low, the device can provide a large deformation capacity to meet the limit displacement requirements of the rubber isolation pad in the horizontal direction.

[0019] When an earthquake or vibration occurs in the vertical direction, a large amount of earthquake energy can be consumed through the reciprocating compression deformation of the viscoelastic energy-absorbing unit, thereby achieving a vertical shock-absorbing effect.

[0020] When the rubber seismic isolation bearing is subjected to the vertical uplift caused by the lateral overturning of the building, the compression of the viscoelastic energy dissipation unit in the rectangular steel box can generate great stiffness, providing a large tensile force for the bearing and preventing the core rubber seismic isolation pad from being pulled apart; with the end of the earthquake or vibration, the core rubber seismic isolation pad returns to its initial equilibrium position, the tension provided by the steel wire rope disappears, and the deformation of the viscoelastic energy dissipation unit is restored.

[0021] Compared with the prior art, the technical solution of the present invention has the following beneficial effects: 1. The device can provide multi-directional shock absorption performance and pull-out resistance for the rubber isolation bearing. Under the action of horizontal and vertical earthquakes or vibrations, the viscoelastic energy dissipation unit can be reciprocated to consume a large amount of input energy, providing multi-directional isolation and damping performance for the isolation bearing. At the same time, the viscoelastic energy dissipation unit has a large compression stiffness, which increases the pull-out resistance of the rubber isolation bearing.

[0022] Second, the device makes full use of the space around the rubber isolation bearing. The device is installed around the rubber isolation bearing and does not occupy the space of the rubber core pad, and will not affect the performance of the rubber core pad. The maximum deformation that the device can provide is the sum of the compression deformation of each viscoelastic energy dissipation unit. Since the viscoelastic energy dissipation units in the device are arranged in parallel in the horizontal direction, even if the height of the rubber bearing is limited, the device can still produce a large deformation. At the same time, the viscoelastic energy dissipation unit used in the device has good elasticity. Even if a large compression deformation occurs, the deformation can still be restored after unloading.

[0023] 3. The device can be applied to traditional rubber isolation bearings. The device only needs to be directly installed in the rubber isolation bearing to provide vertical tensile resistance and multi-dimensional isolation and damping performance for the isolation bearing. There is no need to change the form of the traditional bearing, which is convenient for promotion in actual projects. At the same time, the device is easy to install and disassemble, and is easy to inspect, repair and replace during long-term use and after a large earthquake or vibration. In addition, the device and the rubber isolation bearing can be produced separately, with low processing and manufacturing costs and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of a double-tube anti-pulling and multi-dimensional shock absorbing device of a seismic isolation bearing of the present invention, wherein: 1. rectangular steel box; 2-1. upper end plate; 2-2. lower end plate; 3. rectangular inner partition; 4-1. first viscoelastic energy dissipation unit; 4-2. second viscoelastic energy dissipation unit; 5-1. first force transmission steel plate; 5-2. second force transmission steel plate; 6-1. first steel wire rope; 6-2. second steel wire rope; 7-1. first bolt; 7-2. second bolt; 8-1. gap between the first viscoelastic energy dissipation unit and the rectangular steel box; 8-2. gap between the second viscoelastic energy dissipation unit and the rectangular steel box; 9-1. rubber gasket at the circular hole of the lower end plate; 9-2. rubber gasket at the circular hole of the upper end plate;

[0025] Figure 2 yes Figure 1 Top view;

[0026] Figure 3 It is a detailed drawing of the connection position between the wire rope and the bolt;

[0027] Among them, 10-2, the enlarged end of the connection between the wire rope and the bolt; 11, the steel plate on the rubber seismic isolation bearing.

[0028] Figure 4 It is a top view of the present invention after being installed on a rubber seismic isolation bearing, wherein 12 is a core pad of the rubber seismic isolation bearing. DETAILED DESCRIPTION

[0029] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention.

[0030] like Figures 1 to 4 As shown, the double-tube anti-pullout and multi-dimensional shock-absorbing device of a seismic isolation bearing described in the present invention is composed of a rectangular steel box 1, an upper end plate 2-1, a lower end plate 2-2, a rectangular inner partition 3, a viscoelastic energy dissipation unit, a force transmission steel plate, a steel wire rope and bolts.

[0031] The rectangular inner partition 3 divides the rectangular steel box 1 into two parts from the inside. The viscoelastic energy dissipation unit and the force transmission steel plate are symmetrically arranged in each part with the rectangular inner partition as the axis center. The steel wire rope is used for force transmission between the device and the rubber seismic isolation support, and the bolts are used for connection between the device and the upper and lower steel plates of the rubber seismic isolation support. Example

[0032] like Figure 1 As shown, the rectangular steel box 1 adopts a galvanized seamless hollow rectangular tube, and a rectangular inner partition 3 is vertically arranged inside the rectangular steel box to divide the rectangular steel box cavity into two equal parts, which are the first cavity and the second cavity from left to right. During processing, the rectangular inner partition 3 and the rectangular steel box 1 are connected by double-sided fillet welds.

[0033] The viscoelastic energy dissipation unit includes two pieces, which are made of viscoelastic material with high energy dissipation capacity, vulcanized under high temperature and high pressure, and are shaped like a cylinder with a hole in the center. The first viscoelastic energy dissipation unit 4-1 is arranged in the first cavity of the device, and the second viscoelastic energy dissipation unit 4-2 is arranged in the second cavity of the device.

[0034] The upper end plate 2-1 and the lower end plate 2-2 are both made of rectangular steel plates, which are respectively arranged in parallel at the two ends of the rectangular steel box 1, and each end plate is opened with a single-sided circular hole, wherein the circular hole of the upper end plate 2-1 is located at the center of the second cavity, and the circular hole of the lower end plate 2-2 is located at the center of the first cavity. At the same time, a circle of rubber gasket is arranged around each circular hole.

[0035] The steel wire rope plays a role of transmitting force and passes through the central hole of each viscoelastic energy absorbing unit to drive the force transmitting steel plate to compress the viscoelastic energy absorbing unit.

[0036] The force transmission steel plate is a cylinder with a hole in the center, which is in close contact with each viscoelastic energy dissipation unit. Two diameters of holes are processed along the thickness of the force transmission steel plate. After the steel wire rope passes through the hole with a small diameter, an enlarged end is set at the hole with a large diameter to achieve a firm connection with the force transmission steel plate.

[0037] When the device is processed, the first viscoelastic energy dissipation unit 4-1, the second viscoelastic energy dissipation unit 4-2, the first force transmission steel plate 5-1, and the second force transmission steel plate 5-2 are processed separately. After completion, the steel wire rope is passed through the central holes of the two respectively for assembly.

[0038] The assembled whole is arranged symmetrically in the cavity of the rectangular steel box 1 with the rectangular inner partition as the axis center, wherein the first force transmission steel plate 5-1 in the first cavity is located at the top, and the first viscoelastic energy absorption unit 4-1 is located at the bottom, and the second force transmission steel plate 5-2 in the second cavity is located at the bottom, and the second viscoelastic energy absorption unit 4-2 is located at the top.

[0039] The other end of the first steel wire rope 6-1 passes through the hole of the first viscoelastic energy dissipation unit, passes through the hole of the lower end plate 2-2, and is connected to the first bolt 7-1; the other end of the second steel wire rope 6-2 passes through the hole of the second viscoelastic energy dissipation unit, passes through the hole of the upper end plate 2-1, and is connected to the second bolt 7-2.

[0040] The upper end plate, the lower end plate and the inner wall of the rectangular steel box 1 are connected by welding. In order to make the welding firm, cutouts are provided around the inner wall of the rectangular steel box and the upper and lower end plates to increase the welding area.

[0041] The center of the bolt is provided with holes of two diameters. After the wire rope passes through the hole of the small diameter, an enlarged end 10 is arranged at the hole of the large diameter to realize the hinge connection between the wire rope and the bolt.

[0042] After opening a threaded hole with a size equal to the diameter of the first bolt 7-1 on the lower steel plate of the rubber seismic isolation bearing, a threaded hole with a diameter equal to the second bolt 7-2 is opened at the corresponding position of the steel plate on the bearing based on the horizontal displacement of the two first bolts 7-1, ensuring that the horizontal distance between the two threaded holes is equal to the horizontal distance between the two bolts, and the device can be installed on the rubber seismic isolation bearing.

[0043] The working method of a double-tube anti-pullout and multi-dimensional shock-absorbing device of a seismic isolation bearing in an embodiment of the present invention is as follows: threaded holes corresponding to the size and position of bolts are respectively opened on the upper and lower steel plates of the rubber seismic isolation bearing, and the device is installed on the bearing through bolts at the ends, so that the rubber seismic isolation bearing has the function of resisting multi-dimensional earthquakes or vibrations and a greater ability to resist pullout.

[0044] Under the action of earthquake or vibration in the horizontal direction, the rubber seismic isolation bearing undergoes horizontal shear deformation, producing a seismic isolation effect. At the same time, as the bearing deforms, the device tilts, causing the steel wire rope to generate tension. After the steel wire rope is pulled, it will drive the force transmission steel plate to compress the viscoelastic energy dissipation unit. With the reciprocating motion of the viscoelastic energy dissipation unit, a large amount of earthquake or vibration energy will be consumed, providing a horizontal vibration reduction effect.

[0045] Since the viscoelastic energy absorption unit itself has a large compression deformation capacity, and two viscoelastic energy absorption units are arranged in parallel in the device, the maximum deformation that the device can produce is the sum of the compression amounts of each viscoelastic energy absorption unit. Therefore, the device has a large deformation capacity. Even if the rubber seismic isolation bearing undergoes a large horizontal displacement under rare earthquakes or encounters severe vibrations, the deformation of the device does not reach the limit, and therefore will not affect the seismic isolation performance of the bearing in the horizontal direction.

[0046] Under the action of earthquake or vibration in the vertical direction, the reciprocating compression and deformation of the viscoelastic energy dissipation unit can consume a large amount of earthquake energy and achieve a vertical shock absorption effect. At the same time, the viscoelastic energy dissipation unit has a large compression stiffness. When the building structure is lifted upward or overturned laterally, the device can provide a large tensile force to prevent the rubber seismic isolation bearing from being pulled apart.

[0047] The device can be easily installed on the rubber isolation support by bolts, so that the rubber isolation support can fully exert its original advantages while having the function of resisting multi-dimensional earthquakes or vibrations and greater pull-out resistance. At the same time, since the device has a large deformation capacity and can deform with the horizontal displacement of the rubber isolation support, it will not affect the isolation performance of the rubber isolation support in the horizontal direction. In addition, the device can be disassembled for inspection during long-term use, and can be easily repaired and replaced after a strong earthquake or large vibration.

Claims

1. A double-tube anti-pullout and multi-dimensional shock absorbing device for a seismic isolation support, comprising: A rubber seismic isolation support, characterized in that threaded holes are respectively provided at corresponding positions of the upper steel plate and the lower steel plate of the rubber seismic isolation support, and a plurality of groups of multi-directional energy absorbing units are installed between the upper steel plate and the lower steel plate by bolts in cooperation with the threaded holes, and are symmetrically arranged around the core rubber seismic isolation pad of the rubber seismic isolation support, and each group of multi-directional energy absorbing units comprises: a rectangular steel box, an upper end plate arranged at the upper end of the rectangular steel box, a lower end plate arranged at the lower end of the rectangular steel box, and a rectangular inner partition plate arranged inside the rectangular steel box, wherein the rectangular inner partition plate evenly divides the inner cavity of the rectangular steel box into two parts arranged in parallel, namely a first cavity and a second cavity; A first viscoelastic energy dissipation unit is provided in the first cavity, and a second viscoelastic energy dissipation unit is provided in the second cavity; A first steel wire rope, one end of which penetrates from the lower end plate at one side of the first cavity, passes through the first viscoelastic energy dissipation unit and is fixedly connected to the first force transmission steel plate, the first force transmission steel plate is arranged in the first cavity and is located between the first viscoelastic energy dissipation unit and the upper end plate; the other end of the first steel wire rope extends out of the first cavity and is hinged to the bolt; A second steel wire rope, one end of which passes through a side of the second cavity on the upper end plate, passes through the second viscoelastic energy dissipation unit and is fixedly connected to the second force transmission steel plate. The second force transmission steel plate is arranged in the second cavity and between the second viscoelastic energy dissipation unit and the lower end plate; the other end of the second steel wire rope extends out of the second cavity and is hinged to a bolt.

2. The double-tube anti-pulling and multi-dimensional shock absorbing device of the seismic isolation support according to claim 1 is characterized in that: The first viscoelastic energy dissipation unit and the second viscoelastic energy dissipation unit are both made of high-dissipation viscoelastic materials and are in the shape of a cylinder with a hole in the center.

3. The double-tube anti-pulling and multi-dimensional shock absorbing device of the seismic isolation support according to claim 1 is characterized in that: The upper end plate and the lower end plate are both rectangular steel plates, which are arranged in parallel at the upper and lower ends of the rectangular steel box, and each end plate is respectively provided with a single-sided circular hole, wherein the circular hole on the upper end plate is located at the center of the first cavity, and the circular hole on the lower end plate is located at the center of the second cavity. At the same time, a circle of rubber gasket is respectively arranged around each circular hole.

4. The double-tube anti-pulling and multi-dimensional shock absorbing device of the seismic isolation support according to claim 1 is characterized in that: The center of the first viscoelastic energy dissipation unit is provided with a hole for the first steel wire rope to pass through, and the center of the second viscoelastic energy dissipation unit is provided with a hole for the second steel wire rope to pass through; The first force transmission steel plate has the same structure as the second force transmission steel plate, both of which are cylinders with a hole in the center, which are in close contact with the viscoelastic energy dissipation unit. The force transmission steel plate is processed with holes of two diameters along the thickness direction, wherein the steel wire rope passes through the hole of small diameter and an enlarged end is arranged at the hole of large diameter to realize the force transmission connection with the force transmission steel plate.

5. The double-tube anti-pulling and multi-dimensional shock absorbing device of the seismic isolation support according to claim 1 is characterized in that: The first force transmission steel plate is slidably connected to the inner wall of the first cavity; the second force transmission steel plate is slidably connected to the inner wall of the second cavity.

6. A seismic isolation method based on the double-tube anti-pulling and multi-dimensional shock absorbing device of the seismic isolation support according to any one of claims 1 to 5, characterized in that: By opening threaded holes evenly around the core rubber isolation pad on the rubber isolation support, multiple groups of multi-directional energy dissipation units are installed between the upper steel plate and the lower steel plate by bolts, providing the rubber isolation support with multi-directional shock absorption performance and vertical pull-out resistance. When an earthquake or vibration occurs in the horizontal direction, the isolation support undergoes horizontal shear deformation, and the core rubber isolation pad deforms under the shear force to produce a shock-absorbing effect. At the same time, as the deformation of the core rubber isolation pad increases, the device tilts to cause the steel wire rope in the multi-directional energy dissipation unit to generate tension, and the steel wire rope drives the force transmission steel plate to compress the viscoelastic energy dissipation unit in the rectangular steel box, thereby consuming a large amount of earthquake or vibration energy and providing a horizontal vibration reduction effect. The maximum deformation that the device can provide is the sum of the deformations of the two viscoelastic energy dissipation units. Since the viscoelastic energy dissipation units are arranged in parallel in the horizontal direction, even if the height of the rubber isolation pad is low, the device can provide a large deformation capacity to meet the limit displacement requirements of the rubber isolation pad in the horizontal direction. When an earthquake or vibration occurs in the vertical direction, a large amount of earthquake energy can be consumed through the reciprocating compression deformation of the viscoelastic energy dissipation unit, achieving a vertical shock absorption effect; When the rubber isolation bearing is subjected to the vertical lifting effect caused by the lateral overturning of the building, the compression of the viscoelastic energy dissipation unit in the rectangular steel box can generate large stiffness, providing a large tensile force for the bearing to prevent the core rubber isolation pad from being pulled apart; As the earthquake or vibration ends, the core rubber isolation pad returns to its initial equilibrium position, the tension provided by the wire rope disappears, and the deformation of the viscoelastic energy dissipation unit is restored.

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