A seismic isolation support and a three-dimensional seismic isolation device

Abstract

The present invention discloses a seismic isolation bearing and a three-dimensional seismic isolation device, which relate to the technical field of seismic isolation in construction engineering, and include a shell; a first seismic isolation unit, which is slidably arranged on the shell and can perform linear reciprocating motion in the horizontal direction; a second seismic isolation unit, which is fixed to the first seismic isolation unit, and the second seismic isolation unit includes a first elastic member and a connecting platform, the first elastic member is vertically arranged, the connecting platform is pressed against the top of the first elastic member and can perform linear reciprocating motion in the vertical direction, and the connecting platform is used to connect to the outside; and an adjustment unit, which is installed on the shell, and the adjustment units are arranged on both sides of the movement direction of the first seismic isolation unit, and the adjustment unit is used to provide pre-pressure acting on the first seismic isolation unit. The seismic isolation bearing of the embodiment of the present invention can realize the dual control function of vibration and vibration.

Description

Technical Field

[0001] The invention relates to the technical field of earthquake isolation in building engineering construction, and in particular to an earthquake isolation support and a three-dimensional earthquake isolation device. Background Art

[0002] In the field of construction engineering, as the seismic isolation technology gradually matures, more and more buildings have adopted seismic isolation technology. Seismic isolation technology mainly extends the natural vibration period of the superstructure and reduces the seismic response of the structure through the setting of seismic isolation bearings, and realizes seismic protection of the superstructure in a soft-hard way. In recent years, with the continuous development of my country's economy and the continuous improvement of urbanization, subways have gradually been favored by people as an environmentally friendly, convenient, efficient and comfortable option. The operation of the subway will also generate environmental vibrations that will cause the comfort of the surrounding and upper buildings or affect the normal operation of the equipment. Therefore, the buildings, structures or equipment around or on the subway, in addition to resisting earthquakes, also need to resist traffic environment vibrations to ensure the comfort of the building or the normal operation of the equipment.

[0003] At present, the commonly used three-dimensional seismic isolation (vibration) bearings include thick laminated rubber bearings and seismic isolation bearings that connect traditional seismic isolation bearings in series with vertical seismic isolation elements. Thick laminated rubber bearings achieve vertical seismic isolation by increasing the thickness of a single layer of rubber and reducing the vertical stiffness of the seismic isolation bearing. However, this bearing has problems such as low bearing capacity and poor bearing stability, and it is difficult to meet the requirements of high-bearing capacity seismic isolation bearings for high-rise buildings and surrounding buildings. Traditional isolation bearings used in series form mainly include laminated rubber bearings, friction pendulum isolation bearings and skateboard isolation bearings. Traditional laminated rubber isolation bearings are mainly used in low-rise buildings. In high-rise buildings, they have problems such as large bearing capacity, easy overturning due to tension; friction pendulum isolation bearings mainly achieve self-reset function through their own gravity, but the upper structure will fluctuate up and down during the sliding process. The upper structure has poor stability and has no tensile function, so it is not suitable for seismic isolation of high-rise buildings; and skateboard isolation bearings, although with better stability, have large horizontal displacement, no self-reset function, and large residual deformation of the isolation structure after an earthquake. Summary of the invention

[0004] The present invention aims to solve at least one of the above-mentioned technical problems in the prior art to a certain extent. To this end, an embodiment of the present invention provides a seismic isolation bearing that can meet the safety of the structure under earthquake action and the comfort of use under vibration in the traffic environment, that is, it can realize the dual control function of vibration and seismic.

[0005] The embodiment of the present invention also provides a three-dimensional seismic isolation device.

[0006] According to an embodiment of the first aspect of the present invention, there is provided a seismic isolation bearing, comprising a shell; a first seismic isolation unit, which is slidably arranged on the shell and can perform linear reciprocating motion in a horizontal direction; a second seismic isolation unit, which is fixed to the first seismic isolation unit, and the second seismic isolation unit comprises a first elastic member and a connecting platform, the first elastic member is vertically arranged, the connecting platform is pressed against the top of the first elastic member and can perform linear reciprocating motion in a vertical direction, and the connecting platform is used to connect to the outside; and an adjusting unit, which is installed on the shell, the adjusting units are arranged on both sides of the movement direction of the first seismic isolation unit, and the adjusting unit is used to provide a pre-pressure acting on the first seismic isolation unit.

[0007] The above-mentioned seismic isolation bearing has at least the following beneficial effects: the first seismic isolation unit can slide linearly and reciprocatingly in the horizontal direction on the shell. When the connecting platform is subjected to a vibration force or thrust in the horizontal direction, the first seismic isolation unit is driven to slide relative to the shell. The friction between the first seismic isolation unit and the shell realizes friction energy consumption to reduce the influence of the vibration force or thrust on the building. At the same time, the horizontal seismic isolation period can be extended. The setting of the adjustment unit provides a certain pre-pressure to act on the first seismic isolation unit so that the first seismic isolation unit has a certain initial static friction force to ensure that the building structure will not produce horizontal slip under the action of small earthquakes and wind loads. Even if a certain initial displacement is generated after the earthquake, the adjustment unit can convert the horizontal vibration load into potential energy, and after the vibration load disappears, the adjustment unit releases the stored potential energy, so that the seismic isolation bearing can realize the sliding self-resettling of the building structure, and the second seismic isolation unit mainly realizes seismic isolation in the vertical direction through the first elastic member, and converts the load generated by the vibration into potential energy and stores it through the first elastic member. After the vibration ends, the first elastic member releases the potential energy to drive the connecting platform to self-resettling. Compared with the existing technology, the seismic isolation bearing of the present application has a high bearing capacity and can also realize the self-resetting function of sliding. It can meet the safety of the building structure under the action of earthquake, and can meet the comfort of the building use under the vibration of the traffic environment, that is, it can realize the dual control function of seismic and vibration.

[0008] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the adjustment unit includes a first adjusting member, a second adjusting member and a second elastic member, the first adjusting member is connected to the shell, one end of the second adjusting member is slidably connected to the first adjusting member, and the other end is movably connected to the first seismic isolation unit and can move with the first seismic isolation unit, the second elastic member is also connected between the second adjusting member and the first seismic isolation unit, the first adjusting member is used to guide the second adjusting member to approach or move away from the first seismic isolation unit during the movement of the first seismic isolation unit, wherein the second elastic member is a coil spring.

[0009] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, a surface of the first adjusting member in contact with the second adjusting member is a first curved surface, and the second adjusting member has a second curved surface matching the first curved surface.

[0010] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the first adjusting member is movably connected to the shell through the third adjusting member, so that the distance between the first adjusting member and the first seismic isolation unit is adjustable.

[0011] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the first seismic isolation unit includes a first buffer component, and the shell is provided with a sliding groove for the first buffer component to slide.

[0012] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the shell is provided with a first limit member and a second limit member, the first limit member is arranged on both sides of the second limit member, the thickness of the first limit member is greater than the thickness of the second limit member, so that the two first limit members and the second limit members cooperate to form the slide groove, wherein one side of the second limit member is in contact with the first buffer member.

[0013] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the second limit member is made of mirror stainless steel, and the first buffer member is made of polyethylene.

[0014] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the second seismic isolation unit also includes a first connecting member and a second connecting member, the first connecting member is embedded in the first seismic isolation unit, and the second connecting member is arranged around the periphery of the first connecting member to form a cavity, the first elastic member and a cover plate laid on the top of the first elastic member are arranged in the cavity, the edge gap of the cover plate matches the cavity and can slide up and down in the vertical direction, the connecting platform is fixedly connected to the cover plate, wherein the first elastic member is a disc spring.

[0015] According to the seismic isolation bearing described in the embodiment of the first aspect of the present invention, the shell includes a bottom plate and a side plate, the side plate is arranged around the edge of the bottom plate to form a storage cavity for accommodating the first seismic isolation unit, the second seismic isolation unit and the adjustment unit, and the side plate is extended with a limit plate for limiting the second seismic isolation unit from detaching from the storage cavity.

[0016] According to an embodiment of the second aspect of the present invention, there is provided a three-dimensional seismic isolation device, comprising two of the seismic isolation supports described above, the bottoms of the shells of the two seismic isolation supports being connected to each other, and the movement directions of the first seismic isolation units of the two seismic isolation supports being perpendicular to each other.

[0017] The above-mentioned three-dimensional seismic isolation device has at least the following beneficial effects: the bottoms of the shells of the two seismic isolation supports are connected to each other, and the movement directions of the first seismic isolation units of the seismic isolation supports are made perpendicular to each other, thereby completing the assembly of the three-dimensional seismic isolation device, and realizing self-resettling by sliding in any horizontal direction through the combination of the two first seismic isolation units, and realizing self-resettling by sliding in the vertical direction through the second seismic isolation unit, thereby forming a three-dimensional vibration isolation effect, which can not only meet the safety of the building structure under the action of an earthquake, but also meet the comfort of the building structure under the vibration of the traffic environment, that is, it can realize the dual control function of seismic vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments;

[0019] Figure 1 The structure of the seismic isolation support of the embodiment of the present invention is shown in FIG. Figure 1 ;

[0020] Figure 2 The structure of the seismic isolation support of the embodiment of the present invention is shown in FIG. Figure 2 ;

[0021] Figure 3 The structure of the seismic isolation support of the embodiment of the present invention is shown in FIG. Figure 3 ;

[0022] Figure 4 is a schematic diagram of the first seismic isolation unit generating slip in an embodiment of the present invention;

[0023] Figure 5 is a schematic diagram of the connection between the first adjusting member and the second adjusting member in an embodiment of the present invention;

[0024] Figure 6 is a schematic structural diagram of a three-dimensional seismic isolation device in an embodiment of the present invention;

[0025] Figure 7 is a horizontal hysteresis curve diagram acting on the seismic isolation bearing under different horizontal loading amplitudes in an embodiment of the present invention;

[0026] Figure 8 It is a horizontal hysteresis curve diagram of the seismic isolation bearing under different preload displacements of the second elastic member in the embodiment of the present invention. DETAILED DESCRIPTION

[0027] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0029] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0031] Reference Figures 1 to 3 The embodiment of the present invention provides a seismic isolation bearing, which specifically includes a shell 100, a first seismic isolation unit, a second seismic isolation unit and an adjustment unit, wherein the first seismic isolation unit is slidably arranged on the shell 100 and can perform linear reciprocating motion in the horizontal direction, the second seismic isolation unit is fixed to the first seismic isolation unit, the second seismic isolation unit includes a first elastic member 440 and a connecting platform 200, the first elastic member 440 is vertically arranged, the connecting platform 200 is pressed against the top of the first elastic member 440 and can perform linear reciprocating motion in the vertical direction, the connecting platform 200 is mainly used for connecting with the outside, when in use, the connecting platform 200 is generally connected to the building structure, and the adjustment unit is installed on the shell 100, wherein the adjustment units are arranged on both sides of the movement direction of the first seismic isolation unit, the adjustment unit is used to provide a pre-pressure acting on the first seismic isolation unit, and the pre-pressure provided by the adjustment unit acts on the first seismic isolation unit so that the first seismic isolation unit has a certain initial static friction.

[0032] The effect of the seismic isolation support during use is now specifically described. The first seismic isolation unit can perform a linear reciprocating slide in the horizontal direction on the shell 100. When the connecting platform 200 is subjected to a vibration force or thrust in the horizontal direction, the first seismic isolation unit and the shell 100 are driven to slide relative to each other. The friction between the first seismic isolation unit and the shell 100 realizes friction energy consumption to reduce the impact of the vibration force or thrust in the horizontal direction on the building. At the same time, the seismic isolation period in the horizontal direction can be extended to avoid the overturning caused by excessive horizontal swing of the building structure. Among them, the setting of the adjustment unit provides a certain pre-pressure to act on the first seismic isolation unit so that the first seismic isolation unit has A certain initial static friction force ensures that the building structure will not slip horizontally under the action of small earthquakes and wind loads. Even if a certain initial displacement occurs after the earthquake, the adjustment unit can convert the horizontal vibration load into potential energy, and after the vibration load disappears, the adjustment unit releases the stored potential energy so that the seismic isolation bearing can achieve the sliding self-reset of the building structure. The second seismic isolation unit mainly realizes seismic isolation in the vertical direction through the first elastic member 440, and converts the load generated by the vibration into potential energy and stores it through the first elastic member 440. After the vibration ends, the first elastic member 440 releases the potential energy to drive the connection platform 200 to self-reset. Compared with the prior art, the seismic isolation bearing of the present application has a high bearing capacity and can also realize the self-reset function of sliding, which can meet the safety of the building structure under the action of earthquakes and the comfort of building use under the vibration of the traffic environment, that is, it can realize the dual control function of vibration and vibration.

[0033] In some embodiments, the shell 100 includes a bottom plate 150 and a side plate 140, and the side plate 140 is arranged around the edge of the bottom plate 150 to form a storage cavity for accommodating the first seismic isolation unit, the second seismic isolation unit and the adjustment unit. Specifically, the first seismic isolation unit is slidably arranged on the bottom plate 150, and one side of the adjustment unit is connected to the side plate 140. The side plate 140 extends with a limiting plate 110 for limiting the second seismic isolation unit from being separated from the storage cavity. After the second seismic isolation unit is installed on the first seismic isolation unit, the connecting platform 200 passes through the limiting plate 110 for connecting to the outside, and the limiting plate 110 is provided with a notch for the movement of the connecting platform 200, such as Figure 1 As shown, the entire seismic isolation support structure is compact, and the setting of the limit plate 110 can effectively limit the floating height of the connecting platform 200 in the vertical direction. In addition, the limit plate 110 can also limit the first seismic isolation unit to prevent the first seismic isolation unit from detaching from the bottom plate 150 after the connecting platform 200 is subjected to a horizontal load.

[0034] Further, such as Figure 1As shown, the adjustment unit includes a first adjustment member 320, a second adjustment member 330 and a second elastic member 340. The first adjustment member 320 is connected to the housing 100, specifically, the side plate 140 of the housing 100. One end of the second adjustment member 330 is slidably connected to the first adjustment member 320, and the other end is movably connected to the first seismic isolation unit and can move with the first seismic isolation unit. A second elastic member 340 is also connected between the second adjustment member 330 and the first seismic isolation unit. The component that provides the pre-pressure is mainly the second elastic member 340. The sliding connection with the second adjusting member 330, when the first seismic isolation unit generates horizontal displacement due to vibration, the second adjusting member 330 can slide along with the first seismic isolation unit while also being able to press against the second elastic member 340 to provide pre-pressure to the first seismic isolation unit. It should be noted that the first adjusting member 320 is used to guide the second adjusting member 330 toward or away from the first seismic isolation unit during the movement of the first seismic isolation unit, so that the pre-pressure to which the first seismic isolation unit is subjected changes in real time when displacement occurs. In this embodiment, the initial state of the seismic isolation support is as follows: Figure 2 As shown, at this time, the pre-pressure generated by the second elastic member 340 on the first seismic isolation unit is minimal. When the first seismic isolation unit is displaced horizontally away from the initial position due to vibration, the first adjustment member 320 guides the second adjustment member 330 to move toward the first seismic isolation unit. Figure 4 As shown, therefore, the second adjustment member 330 compresses the second elastic member 340, and stores the load caused by the vibration as potential energy. At this time, the preload acting on the first seismic isolation unit increases, that is, the friction between the first seismic isolation unit and the shell 100 increases, which can further reduce the horizontal sliding speed of the first seismic isolation unit, and then reduce the final sliding displacement, and avoid the building structure from being subjected to excessive horizontal displacement swing. When the load caused by the vibration disappears, the second elastic member 340 releases the stored potential energy and drives the first seismic isolation unit to return to its initial state, that is, the self-resetting function of horizontal sliding can be realized. In this embodiment, the second elastic member 340 is a coil spring.

[0035] like Figure 5 As shown, the first adjusting member 320 and the second adjusting member 330 contact a first arc surface 321, and the second adjusting member 330 has a second arc surface matched with the first arc surface 321. The first adjusting member 320 is concave toward the direction away from the first seismic isolation unit to form the first arc surface 321. When the vibration isolation support is in the initial state, the second adjusting member 330 is in the state as shown in FIG. Figure 2At the lowest point of the first arc surface 321 shown, when no external force acts on the connecting platform 200, the second elastic member 340 provides a certain pre-pressure to act on the first seismic isolation unit, so that the first seismic isolation unit has a certain initial static friction force, ensuring that the building structure will not produce horizontal slip under the action of small earthquakes and wind loads, so that the seismic isolation bearing has a certain initial stiffness in this state.

[0036] In some other embodiments, the first adjusting member 320 is movably connected to the housing 100 through the third adjusting member 310, so that the distance between the first adjusting member 320 and the first seismic isolation unit is adjustable. Specifically, the first adjusting member 320 is movably arranged in the storage cavity in the housing 100, the third adjusting member 310 is threadedly connected to the outside of the housing 100, and one end of the third adjusting member 310 extends into the storage cavity and is rotatably connected to the first adjusting member 320. The knob of the third adjusting member 310 can realize the adjustable distance between the first adjusting member 320 and the first seismic isolation unit, and then can adjust the compression amount of the second adjusting member 330 compressing the second elastic member 340, so as to adjust the pre-pressure of the second elastic member 340 acting on the first seismic isolation unit, so as to realize the adjustable initial static friction force of the first seismic isolation unit. In this embodiment, the third adjusting member 310 is a bolt.

[0037] In this embodiment, the first seismic isolation unit includes a first buffer member 410, and the shell 100 is provided with a slide groove for the first buffer member 410 to slide, and the slide groove serves to guide the first buffer member 410 to perform linear reciprocating motion. Specifically, the shell 100 is provided with a first limit member 120 and a second limit member 130, and the first limit member 120 is arranged on both sides of the second limit member 130. The thickness of the first limit member 120 is greater than the thickness of the second limit member 130, so that the two first limit members 120 and the second limit member 130 cooperate to form a slide groove, wherein one side of the second limit member 130 is in contact with the first buffer member 410, specifically, the first buffer member 410 slides on the second limit member 130, and the initial static friction force of the first seismic isolation unit can be effectively controlled by controlling the friction coefficient between the second limit member 130 and the first buffer member 410 and controlling the initial compression amount of the second elastic member 340, so that the seismic isolation bearing has a certain initial stiffness in the initial state. It should be noted that the second limit member 130 is made of mirror stainless steel, and the first buffer member 410 is made of polyethylene. The combination of mirror stainless steel and polyethylene can greatly increase the service life of the seismic isolation bearing.

[0038] In other embodiments, Figure 1As shown, the second seismic isolation unit also includes a first connecting member 420 and a second connecting member 430. The first connecting member 420 is embedded in the first seismic isolation unit, and the second connecting member 430 is arranged around the periphery of the first connecting member 420 to form a cavity. The cavity is provided with a first elastic member 440 and a cover plate 450 laid on the top of the first elastic member 440. The edge gap of the cover plate 450 matches the cavity and can slide up and down in the vertical direction. The connecting platform 200 is fixedly connected to the cover plate 450. When the vibration generates a vertical load acting on the connecting platform 200, the connecting platform 200 drives the cover plate 450 to move vertically downward to compress the first elastic member 440. The first elastic member 440 converts part of the vertical load into potential energy and stores it. When the vertical load generated by the vibration disappears, the first elastic member 440 releases the stored energy and drives the connecting platform 200 to reset, thereby realizing the sliding self-reset in the vertical direction. In this embodiment, the first elastic member 440 is a disc spring. It should be noted that the vertical vibration isolation of the seismic isolation bearing should be designed according to the axial force of the column of the specific building structure, and the number and combination of disc springs required should be determined by considering the magnitude of the column axial force and the vibration isolation frequency and amplitude of the environment.

[0039] Compared with the prior art, the present embodiment has a variable stiffness (post-hardening stiffness) characteristic in the horizontal direction, that is, when the deformation of the seismic isolation bearing is small, the horizontal post-yield stiffness is low, and the horizontal post-yield stiffness increases nonlinearly with the increase of deformation; under the action of smaller seismic motion, the deformation of the seismic isolation bearing is small, and at this time, the horizontal post-yield stiffness of the seismic isolation bearing is small, which can better realize the seismic isolation capacity in small and medium earthquakes; under the action of large and huge earthquakes, the horizontal post-yield stiffness of the seismic isolation bearing shows a nonlinear increasing trend with the increase of the horizontal displacement of the seismic isolation bearing, which can prevent the seismic isolation bearing from further producing greater horizontal deformation. While achieving good seismic isolation capacity, the horizontal displacement of the upper structure of the isolation layer can be reduced, thereby avoiding collision between the upper building and the seismic isolation ditch or adjacent buildings, and protecting the safety of the upper structure.

[0040] In addition, the seismic isolation bearing of the present embodiment has an adjustable horizontal yield force. In order to protect the seismic isolation structure from horizontal displacement under the action of wind load, an external wind-resistant device is often required to enhance the horizontal yield force of the entire seismic isolation layer. The wind load coefficients are different in different regions, and it is often necessary to design seismic isolation bearings with different yield forces. The seismic isolation bearing in the present embodiment can achieve different sizes of horizontal yield forces (that is, the initial static friction force of the first seismic isolation unit) by adjusting the third adjusting member 310 to control the second adjusting member 330 to compress the second elastic member 340. A certain range of horizontal yield forces can be obtained without replacing any accessories, thereby enhancing the applicability of the seismic isolation bearing.

[0041] like Figure 6As shown, the present invention also provides a three-dimensional seismic isolation device, which specifically includes two of the above-mentioned seismic isolation supports, the bottoms of the shells 100 of the two seismic isolation supports are interconnected, and the movement directions of the first seismic isolation units of the two seismic isolation supports are perpendicular to each other. The bottoms of the shells 100 of the two seismic isolation supports are interconnected, and the movement directions of the first seismic isolation units of the seismic isolation supports are made perpendicular to each other, so as to complete the assembly of the three-dimensional seismic isolation device. In some other embodiments, the movement directions of the first seismic isolation units of the two seismic isolation supports may not be perpendicular. The sliding self-resettling in any horizontal direction is achieved through the combination of the two first seismic isolation units, and the sliding self-resettling in the vertical direction is achieved through the second seismic isolation unit, thereby forming a three-dimensional vibration isolation effect, which can meet the safety of the building structure under the action of an earthquake, and can also meet the comfort of the use of the building structure under the vibration of the traffic environment, that is, it can achieve the dual control function of vibration and vibration.

[0042] Among them, the horizontal force analysis of the seismic isolation bearing shows that the bearing restoring force includes two parts, namely the friction force of the first buffer member 410 and the restoring force provided by the adjustment units on both sides, so the seismic isolation bearing restoring force relationship is obtained as follows:

[0043]

[0044] Wherein, F is the restoring force of the seismic isolation support, μ1 is the friction coefficient between the second adjustment member 330 and the first arc surface 321, μ2 is the friction coefficient of the first buffer member 410, k is the stiffness of the second elastic member 340, and x is the displacement of the second elastic member 340 (x=x 1 +(R-Rgcosθ)), x1 is the preload compression displacement of the second elastic member 340, which is also the adjustment displacement of the third adjustment member 310, D is the horizontal displacement of the isolation bearing, R is the curvature radius of the first arc surface 321, and P is the column axial force exerted on the isolation bearing.

[0045] According to the horizontal restoring force relationship of the isolation bearing, the two main parameters of the isolation bearing can be obtained as follows:

[0046] (1) Support yield strength:

[0047] F Q =2·μ 1 ·k·x 1 +μ 2 ·P (1)

[0048] (2) Post-yield stiffness of the support:

[0049]

[0050] From the bearing yield force relationship formula (1), it can be obtained that the horizontal yield force of the seismic isolation bearing is related to four fixed parameters, namely, the friction coefficient μ1 between the second adjusting member 330 and the first curved surface 321, the friction coefficient μ2 of the first buffer member 410, the stiffness k of the second elastic member 340, and the column axial force P exerted on the seismic isolation bearing. Different horizontal yield forces of the seismic isolation bearing can be obtained by adjusting the displacement x1 of the third adjusting member 310.

[0051] From the post-yield stiffness relationship of the bearing in formula (2), it can be obtained that the post-yield stiffness kc of the isolation bearing shows a nonlinear increasing trend as the displacement D of the isolation bearing increases, that is, the isolation bearing has a variable stiffness (post-hardening stiffness) characteristic in the horizontal direction.

[0052] Among them, the ABAQUS analysis finite element model of the support is established, and it can be obtained Figure 7 In the figure, the horizontal hysteresis curves acting on the seismic isolation support under different horizontal loading amplitudes are shown in Figure 7 As shown in the figure, when the displacement of the isolation bearing is 100mm and 200mm, the horizontal post-yield stiffness of the isolation bearing is low. As the displacement gradually increases, the horizontal post-yield stiffness increases, showing a post-hardening stiffness characteristic.

[0053] Among them, the ABAQUS analysis finite element model of the support is established, and it can be obtained Figure 8 In the figure, the horizontal hysteresis curve of the seismic isolation support under different preload displacements of the second elastic member 340 is as follows: Figure 8 As shown, the seismic isolation bearing has different horizontal yield forces under different preload displacements of the second elastic member 340 , and the horizontal yield force of the seismic isolation bearing gradually increases with the increase of the preload displacement of the second elastic member 340 .

[0054] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A seismic isolation bearing, Features: include Housing (100); a first seismic isolation unit, the first seismic isolation unit being slidably disposed on the shell (100) and capable of linear reciprocating motion in a horizontal direction, wherein the first seismic isolation unit comprises a first buffer member (410), and the shell (100) is provided with a slide groove for the first buffer member (410) to slide; a second seismic isolation unit, fixed to the first seismic isolation unit, the second seismic isolation unit comprising a first elastic member (440) and a connecting platform (200), the first elastic member (440) being arranged vertically, the connecting platform (200) being pressed against the top of the first elastic member (440) and being capable of linear reciprocating motion in a vertical direction, the connecting platform (200) being used for connecting to the outside; and an adjustment unit, mounted on the housing (100), the adjustment unit being arranged on both sides of the movement direction of the first seismic isolation unit, the adjustment unit being used to provide a pre-pressure acting on the first seismic isolation unit; The adjustment unit comprises a first adjustment member (320), a second adjustment member (330) and a second elastic member (340); the first adjustment member (320) is connected to the shell (100); one end of the second adjustment member (330) is slidably connected to the first adjustment member (320); the other end is movably connected to the first seismic isolation unit and can move with the first seismic isolation unit; the second elastic member (340) is also connected between the second adjustment member (330) and the first seismic isolation unit; the first adjustment member (320) is used to guide the second adjustment member (330) to move closer to or away from the first seismic isolation unit during the movement of the first seismic isolation unit; the second elastic member (340) is a coil spring.

2. The seismic isolation support according to claim 1, Features: A surface of the first adjusting member (320) that contacts the second adjusting member (330) is a first arc surface (321), and the second adjusting member (330) has a second arc surface that matches the first arc surface (321).

3. The seismic isolation support according to claim 1, Features: The first adjusting member (320) is movably connected to the housing (100) via a third adjusting member (310), so that the distance between the first adjusting member (320) and the first seismic isolation unit is adjustable.

4. The seismic isolation support according to claim 1, Features: The housing (100) is provided with a first limiting member (120) and a second limiting member (130), the first limiting member (120) being arranged on both sides of the second limiting member (130), the thickness of the first limiting member (120) being greater than the thickness of the second limiting member (130), so that the two first limiting members (120) and the second limiting member (130) cooperate to form the slide groove, wherein one side of the second limiting member (130) is in contact with the first buffer member (410).

5. The seismic isolation support according to claim 4, Features: The second limiting member (130) is made of mirror-finished stainless steel, and the first buffer member (410) is made of polyethylene.

6. The seismic isolation support according to claim 1, Features: The second seismic isolation unit also includes a first connecting member (420) and a second connecting member (430), wherein the first connecting member (420) is embedded in the first seismic isolation unit, and the second connecting member (430) is arranged around the first connecting member (420) to form a cavity, wherein the first elastic member (440) and a cover plate (450) laid on the top of the first elastic member (440) are arranged in the cavity, wherein the edge gap of the cover plate (450) matches the cavity and can slide up and down in the vertical direction, and the connecting platform (200) is fixedly connected to the cover plate (450), wherein the first elastic member (440) is a disc spring.

7. The seismic isolation bearing according to any one of claims 1 to 6, Features: The housing (100) comprises a bottom plate (150) and a side plate (140); the side plate (140) is arranged around the edge of the bottom plate (150) to form a storage cavity for accommodating the first seismic isolation unit, the second seismic isolation unit and the adjustment unit; the side plate (140) is extended with a limit plate (110) for limiting the second seismic isolation unit from leaving the storage cavity.

8. A three-dimensional seismic isolation device, Features: It comprises two seismic isolation supports as claimed in any one of claims 1 to 7, the bottoms of the shells (100) of the two seismic isolation supports are connected to each other, and the movement directions of the first seismic isolation units of the two seismic isolation supports are perpendicular to each other.

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