Variable vertical force shock insulation rubber support shearing performance test method and mechanical model

Abstract

The invention relates to the technical field of civil engineering shock insulation and test methods, and discloses a variable vertical force shock insulation rubber support shear performance test method and a mechanical model.The method comprises the steps that first vertical pressure F1 is kept unchanged, a horizontal hydraulic servo loader is adopted to apply horizontal displacement to a shock insulation support body in the first direction, and a second vertical pressure F1 is adopted to apply horizontal displacement to the shock insulation support body in the second direction; when the shock insulation support body is loaded to the first displacement X1, the first vertical pressure F1 is gradually and linearly reduced to the second vertical force F2 according to the horizontal displacement X2-X1; the first vertical pressure F1 is kept unchanged, a horizontal hydraulic servo loader is adopted to apply horizontal displacement to the seismic isolation support body in the second direction, when the seismic isolation support body is loaded to third displacement X3, the first vertical pressure F1 is gradually and linearly reduced to second vertical force F2 according to the horizontal displacement X4-X3, and when the seismic isolation support body is loaded to third displacement X3, the first vertical pressure F1 is gradually and linearly reduced to the second vertical force F2 according to the horizontal displacement X4-X3; and finally, a variable vertical force shock insulation rubber support shear hardening model is provided. According to the invention, more accurate test data can be provided, and the actual stress state of the shock insulation support can be reflected more truly when an earthquake occurs.

Description

Technical Field

[0001] The invention relates to the technical field of civil engineering seismic isolation and test methods, and in particular to a shear performance test method and a mechanical model of a variable vertical force seismic isolation rubber bearing. Background Art

[0002] In current engineering practice, the method for determining the shear performance of seismic isolation rubber bearings mainly relies on testing the horizontal shear performance under a constant vertical load. When designing seismic isolation structures, engineers usually use a simplified "double-broken line" model to characterize the shear performance of seismic isolation bearings under a constant vertical load. However, when an actual earthquake occurs, the vertical load borne by the seismic isolation bearing will change with the increase of the horizontal shear displacement, and may even change from pressure to tension. This significant fluctuation in vertical load has an important impact on the shear performance of the seismic isolation bearing. Unfortunately, the current test method for the shear performance of seismic isolation bearings does not fully consider the impact of this vertical load change on the shear performance. At the same time, the existing test method has failed to provide an accurate mechanical model to describe the impact of vertical load changes on the shear performance of seismic isolation bearings.

[0003] At present, the determination of the shear performance of seismic isolation rubber bearings is mainly focused on the horizontal shear performance under constant vertical loads, and there is a lack of experimental determination methods for the shear performance of seismic isolation rubber bearings under vertical load changes, which is not conducive to the evaluation of the horizontal shear performance of seismic isolation rubber bearings when the vertical load changes significantly under earthquakes. When designing seismic isolation structures, the main basis is the "double-fold line" model for the determination of horizontal shear performance under constant vertical loads, without considering the influence of shear performance of seismic isolation rubber bearings under vertical tensile and compressive stress changes. There is a difference between the stress state of seismic isolation rubber bearings under constant vertical loads and the stress state under actual earthquakes. There are safety hazards in the design of seismic isolation structures using the "double-fold line" model based on the determination of horizontal shear performance under constant vertical loads.

[0004] Therefore, it is necessary to set up a shear performance test method and mechanical model for variable vertical force seismic isolation rubber bearings to solve the problems existing in current technology. Summary of the invention

[0005] In view of this, the present invention proposes a shear performance test method and a mechanical model for a variable vertical force seismic isolation rubber bearing, aiming to more accurately evaluate the performance of the seismic isolation bearing under actual earthquake action.

[0006] In one aspect, the present invention provides a method for testing the shear performance of a variable vertical force seismic isolation rubber bearing, comprising:

[0007] S1. Place the seismic isolation bearing test device in the dedicated test area;

[0008] S2. Use high-strength bolts to fix the upper connecting plate to the lower surface of the upper loading platform, and the lower connecting plate to the upper surface of the lower loading platform;

[0009] S3, applying a first vertical pressure F1 to the seismic isolation bearing body using a vertical servo loader;

[0010] S4, keeping the first vertical pressure F1 unchanged, using a horizontal hydraulic servo loader to apply a horizontal displacement to the seismic isolation support body along a first direction, and loading the seismic isolation support body to a first displacement X1; then using the horizontal hydraulic servo loader to continue applying a horizontal displacement to the seismic isolation support along the first direction, when the seismic isolation support body is loaded from the first displacement X1 to the second displacement X2, gradually and linearly reducing the first vertical pressure F1 to a second vertical force F2 as the horizontal displacement X2-X1 changes, and recording the change of the first horizontal force in real time;

[0011] S5, unloading the horizontal hydraulic servo loader to zero position along the original loading path, and returning the vertical servo loader to the first vertical pressure F1 along the original loading path;

[0012] S6, keeping the first vertical pressure F1 unchanged, using the horizontal hydraulic servo loader to apply horizontal displacement to the seismic isolation bearing body along the second direction, and loading the seismic isolation bearing body to a third displacement X3; then using the horizontal hydraulic servo loader to continue applying horizontal displacement to the seismic isolation bearing along the second direction, when the seismic isolation bearing body is loaded from the third displacement X3 to the fourth displacement X4, gradually and linearly reducing the first vertical pressure F1 to a second vertical force F2 with the change of the horizontal displacement X4-X3, and recording the change of the second horizontal force in real time;

[0013] S7, unloading the horizontal hydraulic servo loader to zero position along the original loading path, and returning the vertical servo loader to the first vertical pressure F1 along the original loading path;

[0014] S8, repeat steps S3-S7 for three times, and collect horizontal force, horizontal displacement and vertical force in real time during the test process;

[0015] S9. Take the horizontal force, horizontal displacement and vertical force recorded in the third cycle to construct a shear hardening model of the variable vertical force seismic isolation rubber bearing, and calculate the shear performance parameters of the seismic isolation bearing according to the shear hardening model of the variable vertical force seismic isolation rubber bearing.

[0016] Furthermore, the seismic isolation bearing test device comprises:

[0017] The seismic isolation support body;

[0018] The upper loading platform is arranged at the top of the seismic isolation support body in the vertical direction;

[0019] The lower loading platform is arranged at the bottom end of the seismic isolation support body in the vertical direction;

[0020] A first support seat, arranged at the bottom of the lower loading platform;

[0021] A second support base, fixedly connected to one end of the first support base;

[0022] A vertical servo loader is arranged on the top of the upper loading platform in a vertical direction;

[0023] A horizontal hydraulic servo loader is arranged on a side of the lower loading platform close to the second support seat in the horizontal direction, one end of the horizontal hydraulic servo loader is connected to the second support seat, and the other end of the horizontal hydraulic servo loader is connected to the lower loading platform;

[0024] The upper connecting plate is detachably connected to the lower surface of the upper loading platform;

[0025] The lower connecting plate is detachably connected to the upper surface of the lower loading platform.

[0026] Further, the first direction and the second direction are opposite to each other in a horizontal direction.

[0027] Further, the horizontal force includes the first horizontal force and the second horizontal force;

[0028] The horizontal displacement includes the first displacement X1, the second displacement X2, the third displacement X3 and the fourth displacement X4;

[0029] The vertical force includes a first vertical pressure F1 and a second vertical force F2.

[0030] Furthermore, when calculating the shear performance parameters of the seismic isolation bearing according to the shear hardening model of the variable vertical force seismic isolation rubber bearing, it includes:

[0031] The first stage is the stiffness k1 of the isolation bearing body before yielding, the second stage is the horizontal stiffness k2 of the isolation bearing body under constant pressure after yielding, the third stage is the horizontal stiffness k3 of the isolation bearing body under vertical force change after yielding, and the horizontal yield force Q of the isolation bearing body; wherein, the stiffness k1 of the isolation bearing body before yielding in the first stage is obtained according to the following formula:

[0032] k1=(10-15)k2;

[0033] The horizontal stiffness k2 of the second stage isolation bearing under constant pressure after yielding is obtained according to the following formula:

[0034]

[0035] The horizontal hardening stiffness k3 under the vertical force change after the yield of the isolation bearing body in the third stage is obtained according to the following formula:

[0036]

[0037] The horizontal yield force Q of the seismic isolation bearing body is obtained according to the following formula:

[0038]

[0039] Among them, Q1 represents the first horizontal force at the first displacement X1 during the loading process, Q2 represents the first horizontal force at the second displacement X2, Q3 represents the second horizontal force at the third displacement X3 during the loading process, Q4 represents the second horizontal force at the fourth displacement X4, X1 represents the first displacement, X2 represents the second displacement, X3 represents the third displacement, Qd1 and Qd2 represent the two horizontal forces when the horizontal displacement is zero when the plane rectangular coordinate system is constructed with the horizontal displacement recorded in the third cycle as the horizontal coordinate and the horizontal force recorded in the third cycle as the vertical coordinate.

[0040] In another aspect, the present invention also proposes a shear hardening model of a variable vertical force seismic isolation rubber bearing, comprising:

[0041] Construct a plane rectangular coordinate system with horizontal displacement as the abscissa and horizontal force as the ordinate;

[0042] The first horizontal force Q1 at the first displacement X1, the first horizontal force Q2 at the second displacement X2, the second horizontal force Q3 at the third displacement X3, the second horizontal force Q4 at the fourth displacement X4, the first displacement X1, the second displacement X2, the third displacement X3, and the fourth displacement X4 are marked in the plane rectangular coordinate system to construct a shear hardening model of the variable vertical force seismic isolation rubber bearing; wherein, X3 = -X1, X4 = -X2;

[0043] The shear hardening model of the variable vertical force seismic isolation rubber bearing is divided into the first stage, the second stage and the third stage, and the vertical force F is calculated respectively.

[0044] Furthermore, the shear hardening model of the variable vertical force seismic isolation rubber bearing is divided into the first stage, the second stage and the third stage, and the vertical force F is calculated respectively, including:

[0045] The vertical force in the first stage is obtained by the following formula:

[0046] F = k1X)X≤Xy);

[0047] The vertical force in the second stage is obtained by the following formula:

[0048] F=k2X-k2X1+Q(Xy <X≤X1);

[0049] The vertical force in the third stage is obtained by the following formula:

[0050] F=k3X-(k3-k2)X1-k2Xy+Q(X1 <X≤X2);

[0051] k3=αk2;

[0052] Among them, k1 is the stiffness of the isolation bearing body before yielding in the first stage, k2 is the horizontal stiffness under constant pressure after yielding in the second stage, k3 is the horizontal hardening stiffness under vertical force change after yielding in the third stage, Xy is the horizontal displacement, X1 is the first displacement, X2 is the second displacement, Q is the horizontal yield force of the isolation bearing body, and α is the strengthening coefficient, which is calculated based on the test data.

[0053] Compared with the existing technology, the beneficial effect of the present invention is that the variable vertical force seismic isolation rubber bearing shear performance test method proposed in the present invention can effectively test the horizontal stiffness of the seismic isolation rubber bearing when the vertical force changes. This method can not only provide more accurate test data, but also more truly reflect the actual stress state of the seismic isolation bearing when an earthquake occurs.

[0054] The shear hardening model of the variable vertical force seismic isolation rubber bearing proposed in the present invention has strong applicability, and can facilitate engineers to fully consider the impact of vertical force changes on shear performance when analyzing seismic isolation structures. In this way, when designing seismic isolation structures, engineers can more accurately consider the actual stress conditions, thereby designing seismic isolation bearing structures that are more in line with actual conditions.

[0055] In summary, the present invention not only improves the accuracy of the shear performance test of the seismic isolation rubber bearing, but also provides a more scientific design basis for engineers, making the design of the seismic isolation structure more reasonable, safe and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0056] Various other advantages and benefits will become apparent to those of ordinary skill in the art by reading the detailed description of the preferred embodiments below. The accompanying drawings are only for the purpose of illustrating the preferred embodiments and are not to be considered as limiting the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0057] Figure 1 A diagram showing the implementation of a loading device used in the variable vertical force seismic isolation rubber bearing shear performance test method provided in an embodiment of the present invention;

[0058] Figure 2A graph showing the relationship between horizontal displacement and vertical force during loading of a shear performance test method for a variable vertical force seismic isolation rubber bearing provided by an embodiment of the present invention;

[0059] Figure 3 A shear trilinear hardening mechanical model of a variable vertical force seismic isolation rubber bearing provided in an embodiment of the present invention;

[0060] Figure 4 A flowchart of a method for testing the shear performance of a variable vertical force seismic isolation rubber bearing provided in an embodiment of the present invention.

[0061] In the figure: 110, first support seat; 120, second support seat; 130, vertical servo loader; 140, upper loading platform; 150, seismic isolation bearing body; 160, lower loading platform; 170, horizontal hydraulic servo loader; 180, upper connecting plate; 190, lower connecting plate. DETAILED DESCRIPTION

[0062] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art. It should be noted that, in the absence of conflict, the embodiments of the present invention and the features described in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0063] See also Figure 1 As shown, in some embodiments of the present application, this embodiment provides a shear performance test method for a variable vertical force seismic isolation rubber bearing, comprising:

[0064] S1. Place the seismic isolation bearing test device in the dedicated test area;

[0065] S2. Use high-strength bolts to fix the upper connecting plate 180 to the lower surface of the upper loading platform 140, and the lower connecting plate 190 to the upper surface of the lower loading platform 160;

[0066] S3, applying a first vertical pressure F1 to the seismic isolation support body 150 using the vertical servo loader 130;

[0067] S4, keeping the first vertical pressure F1 unchanged, using the horizontal hydraulic servo loader 170 to apply horizontal displacement to the seismic isolation support body 150 along the first direction, and loading the seismic isolation support body 150 to the first displacement X1; then using the horizontal hydraulic servo loader 170 to continue to apply horizontal displacement to the seismic isolation support along the first direction, when the seismic isolation support body 150 is loaded from the first displacement X1 to the second displacement X2, the first vertical pressure F1 is gradually and linearly reduced to the second vertical force F2 with the change of the horizontal displacement X2-X1, and the change of the first horizontal force is recorded in real time;

[0068] S5, unloading the horizontal hydraulic servo loader 170 to zero position along the original loading path, and returning the vertical servo loader 130 to the first vertical pressure F1 along the original loading path;

[0069] S6. Keep the first vertical pressure F1 unchanged, use the horizontal hydraulic servo loader 170 to apply horizontal displacement to the seismic isolation support body 150 along the second direction, and load the seismic isolation support body 150 to the third displacement X3; then use the horizontal hydraulic servo loader 170 to continue to apply horizontal displacement to the seismic isolation support along the second direction, when the seismic isolation support body 150 is loaded from the third displacement X3 to the fourth displacement X4, gradually reduce the first vertical pressure F1 linearly to the second vertical force F2 with the change of the horizontal displacement X4-X3, and record the change of the second horizontal force in real time;

[0070] S7, unloading the horizontal hydraulic servo loader 170 to zero position along the original loading path, and returning the vertical servo loader 130 to the first vertical pressure F1 along the original loading path;

[0071] S8, repeat steps S3-S7 for three times, and collect horizontal force, horizontal displacement and vertical force in real time during the test process;

[0072] S9. Take the horizontal force, horizontal displacement and vertical force recorded in the third cycle to construct a shear hardening model of the variable vertical force isolation rubber bearing, and calculate the shear performance parameters of the isolation bearing according to the shear hardening model of the variable vertical force isolation rubber bearing.

[0073] In this embodiment, the seismic isolation bearing test device includes: a seismic isolation bearing body 150; an upper loading platform 140, which is arranged at the top of the seismic isolation bearing body 150 in the vertical direction; a lower loading platform 160, which is arranged at the bottom of the seismic isolation bearing body 150 in the vertical direction; a first support seat 110, which is arranged at the bottom of the lower loading platform 160; a second support seat 120, which is fixedly connected to one end of the first support seat 110; a vertical servo loader 130, which is arranged at the top of the upper loading platform 140 in the vertical direction; a horizontal hydraulic servo loader 170, which is arranged on one side of the lower loading platform 160 close to the second support seat 120 in the horizontal direction, one end of the horizontal hydraulic servo loader 170 is connected to the second support seat 120, and the other end of the horizontal hydraulic servo loader 170 is connected to the lower loading platform 160; an upper connecting plate 180, which is detachably connected to the lower surface of the upper loading platform 140; and a lower connecting plate 190, which is detachably connected to the upper surface of the lower loading platform 160.

[0074] It can be seen that the variable vertical force isolation rubber bearing shear performance test method provided in this embodiment can simulate the stress condition of the isolation bearing under the actual earthquake by precisely controlling the action of the loader during the test. This simulation not only includes the horizontal force, but also the change of vertical force, so that the performance of the isolation bearing can be evaluated more comprehensively. Through this method, the stiffness change of the isolation bearing in different stress stages can be obtained, providing more detailed data support for engineering design.

[0075] In this embodiment, the first direction and the second direction are opposite to each other along the horizontal direction.

[0076] In this embodiment, the horizontal force includes a first horizontal force and a second horizontal force; the horizontal displacement includes a first displacement X1, a second displacement X2, a third displacement X3 and a fourth displacement X4; and the vertical force includes a first vertical pressure F1 and a second vertical force F2.

[0077] It can be seen that through the above steps, the shear performance of the isolation bearing can be fully tested during the test. In addition, by constructing the shear hardening model of the variable vertical force isolation rubber bearing, the performance of the isolation bearing under cyclic loading can be intuitively observed, thereby evaluating its response under actual earthquake action.

[0078] Specifically, when calculating the shear performance parameters of the isolation bearing according to the shear hardening model of the variable vertical force isolation rubber bearing, it includes:

[0079] The first stage is the stiffness k1 of the isolation bearing body before yielding, the second stage is the horizontal stiffness k2 of the isolation bearing body under constant pressure after yielding, the third stage is the horizontal stiffness k3 of the isolation bearing body under vertical force change after yielding, and the horizontal yield force Q of the isolation bearing body; wherein, the stiffness k1 of the isolation bearing body before yielding in the first stage is obtained according to the following formula:

[0080] k1=(10-15)k2;

[0081] The horizontal stiffness k2 of the second stage isolation bearing under constant pressure after yielding is obtained according to the following formula:

[0082]

[0083] The horizontal hardening stiffness k3 under the vertical force change after the yield of the isolation bearing body in the third stage is obtained according to the following formula:

[0084]

[0085] The horizontal yield force Q of the seismic isolation bearing body is obtained according to the following formula:

[0086]

[0087] Among them, Q1 represents the first horizontal force at the first displacement X1 during the loading process, Q2 represents the first horizontal force at the second displacement X2, Q3 represents the second horizontal force at the third displacement X3 during the loading process, Q4 represents the second horizontal force at the fourth displacement X4, X1 represents the first displacement, X2 represents the second displacement, X3 represents the third displacement, Qd1 and Qd2 represent the two horizontal forces when the horizontal displacement is zero when the plane rectangular coordinate system is constructed with the horizontal displacement recorded in the third cycle as the horizontal coordinate and the horizontal force recorded in the third cycle as the vertical coordinate.

[0088] It can be seen that the shear performance parameters reflect the change in stiffness of the seismic isolation bearing under different displacements. The shear performance parameters ki (i=1,2,3) obtained by calculation can be used to evaluate the shear deformation capacity of the seismic isolation bearing under earthquake action, providing a scientific basis for the design and selection of seismic isolation bearings. In addition, through multiple cyclic loading, the performance attenuation of the seismic isolation bearing during long-term use can be simulated to ensure its reliability and safety in practical applications. Finally, the test method and mechanical model provided by the present invention not only improve the accuracy of the performance evaluation of the seismic isolation bearing, but also provide strong technical support for the optimal design and engineering application of the seismic isolation bearing.

[0089] See also Figure 2 As shown, in some embodiments of the present application, this embodiment provides a shear hardening model of a variable vertical force seismic isolation rubber bearing, including:

[0090] Construct a plane rectangular coordinate system with horizontal displacement as the abscissa and horizontal force as the ordinate;

[0091] The first horizontal force Q1 at the first displacement X1, the first horizontal force Q2 at the second displacement X2, the second horizontal force Q3 at the third displacement X3, the second horizontal force Q4 at the fourth displacement X4, the first displacement X1, the second displacement X2, the third displacement X3, and the fourth displacement X4 are marked in a plane rectangular coordinate system to construct a shear hardening model of a variable vertical force seismic isolation rubber bearing; wherein, X3 = -X1, X4 = -X2;

[0092] The shear hardening model of variable vertical force seismic isolation rubber bearing is divided into the first stage, the second stage and the third stage, and the vertical force F is calculated respectively.

[0093] Specifically, the shear hardening model of the variable vertical force seismic isolation rubber bearing is divided into the first stage, the second stage and the third stage, and the vertical force F is calculated separately, including:

[0094] The vertical force in the first stage is obtained by the following formula:

[0095] F = k1X)X≤Xy);

[0096] The vertical force in the second stage is obtained by the following formula:

[0097] F=k2X-k2X1+Q(Xy <X≤X1);

[0098] The vertical force in the third stage is obtained by the following formula:

[0099] F=k3X-(k3-k2)X1-k2Xy+Q(X1 <X≤X2);

[0100] k3=αk2;

[0101] Among them, k1 is the stiffness of the isolation bearing body before yielding in the first stage, k2 is the horizontal stiffness under constant pressure after yielding in the second stage, k3 is the horizontal hardening stiffness under vertical force change after yielding in the third stage, Xy is the horizontal displacement, X1 is the first displacement, X2 is the second displacement, Q is the horizontal yield force of the isolation bearing body, and α is the strengthening coefficient, which is calculated based on the test data.

[0102] It can be understood that the strengthening coefficient α reflects the trend of the horizontal stiffness change of the isolation bearing after yielding as the vertical force changes. In the first stage, when the displacement X is less than or equal to the yield displacement Xy, the horizontal stiffness of the isolation bearing remains unchanged, and the vertical force F is proportional to the displacement X. Entering the second stage, when the displacement X is greater than the yield displacement Xy but less than or equal to the first displacement X1, the calculation of the vertical force F considers the contribution of the horizontal stiffness k2 of the isolation bearing body under constant pressure after yielding in the second stage and the stiffness k1 of the isolation bearing body before yielding in the first stage to the horizontal force Q. In the third stage, when the displacement X is greater than the first displacement X1 but less than or equal to the second displacement X2, the calculation of the vertical force F needs to consider the horizontal hardening stiffness k3 under the change of the vertical force after yielding, the difference between k3 and k2, and the contribution of the stiffness k1 of the isolation bearing body before yielding in the first stage to the horizontal yield force Q of the isolation bearing body. Through such staged calculations, the mechanical behavior of the seismic isolation bearing at different stress stages can be simulated more accurately, providing a more accurate theoretical basis for the design and engineering application of the seismic isolation bearing. Ultimately, the combination of this test method and mechanical model can not only evaluate the shear performance of the seismic isolation bearing, but also predict its performance changes in long-term use, providing strong technical support for the optimal design and safe application of the seismic isolation bearing.

[0103] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0104] The present application is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0105] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0106] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0107] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for testing the shear performance of a variable vertical force seismic isolation rubber bearing, characterized in that: include: S1. Place the seismic isolation bearing test device in the dedicated test area; S2. Use high-strength bolts to fix the upper connecting plate to the lower surface of the upper loading platform, and the lower connecting plate to the upper surface of the lower loading platform; S3, applying a first vertical pressure F1 to the seismic isolation bearing body using a vertical servo loader; S4, keeping the first vertical pressure F1 unchanged, using a horizontal hydraulic servo loader to apply a horizontal displacement to the seismic isolation support body along a first direction, and loading the seismic isolation support body to a first displacement X1; then using the horizontal hydraulic servo loader to continue applying a horizontal displacement to the seismic isolation support along the first direction, when the seismic isolation support body is loaded from the first displacement X1 to the second displacement X2, gradually and linearly reducing the first vertical pressure F1 to a second vertical force F2 as the horizontal displacement X2-X1 changes, and recording the change of the first horizontal force in real time; S5, unloading the horizontal hydraulic servo loader to zero position along the original loading path, and returning the vertical servo loader to the first vertical pressure F1 along the original loading path; S6, keeping the first vertical pressure F1 unchanged, using the horizontal hydraulic servo loader to apply horizontal displacement to the seismic isolation bearing body along the second direction, and loading the seismic isolation bearing body to a third displacement X3; then using the horizontal hydraulic servo loader to continue applying horizontal displacement to the seismic isolation bearing along the second direction, when the seismic isolation bearing body is loaded from the third displacement X3 to the fourth displacement X4, gradually and linearly reducing the first vertical pressure F1 to a second vertical force F2 with the change of the horizontal displacement X4-X3, and recording the change of the second horizontal force in real time; S7, unloading the horizontal hydraulic servo loader to zero position along the original loading path, and returning the vertical servo loader to the first vertical pressure F1 along the original loading path; S8, repeat steps S3-S7 for three times, and collect horizontal force, horizontal displacement and vertical force in real time during the test process; S9. Take the horizontal force, horizontal displacement and vertical force recorded in the third cycle to construct a shear hardening model of the variable vertical force seismic isolation rubber bearing, and calculate the shear performance parameters of the seismic isolation bearing according to the shear hardening model of the variable vertical force seismic isolation rubber bearing.

2. The shear performance test method of variable vertical force seismic isolation rubber bearing according to claim 1 is characterized in that: The seismic isolation bearing test device comprises: The seismic isolation support body; The upper loading platform is arranged at the top of the seismic isolation support body in the vertical direction; The lower loading platform is arranged at the bottom end of the seismic isolation support body in the vertical direction; A first support seat, arranged at the bottom of the lower loading platform; A second support base, fixedly connected to one end of the first support base; A vertical servo loader is arranged on the top of the upper loading platform in a vertical direction; A horizontal hydraulic servo loader is arranged on a side of the lower loading platform close to the second support seat in the horizontal direction, one end of the horizontal hydraulic servo loader is connected to the second support seat, and the other end of the horizontal hydraulic servo loader is connected to the lower loading platform; The upper connecting plate is detachably connected to the lower surface of the upper loading platform; The lower connecting plate is detachably connected to the upper surface of the lower loading platform.

3. The shear performance test method of variable vertical force seismic isolation rubber bearing according to claim 1 is characterized in that: The first direction is opposite to the second direction in a horizontal direction.

4. The shear performance test method of variable vertical force seismic isolation rubber bearing according to claim 1 is characterized in that: The horizontal force includes the first horizontal force and the second horizontal force; The horizontal displacement includes the first displacement X1, the second displacement X2, the third displacement X3 and the fourth displacement X4; The vertical force includes a first vertical pressure F1 and a second vertical force F2.

5. The variable vertical force seismic isolation rubber bearing shear performance test method according to claim 1 is characterized in that: When calculating the shear performance parameters of the isolation bearing according to the shear hardening model of the variable vertical force isolation rubber bearing, it includes: The first stage is the stiffness k1 of the isolation bearing body before yielding, the second stage is the horizontal stiffness k2 of the isolation bearing body under constant pressure after yielding, the third stage is the horizontal stiffness k3 of the isolation bearing body under vertical force change after yielding, and the horizontal yield force Q of the isolation bearing body; wherein, the stiffness k1 of the isolation bearing body before yielding in the first stage is obtained according to the following formula: k1=(10-15)k2; The horizontal stiffness k2 of the second stage isolation bearing under constant pressure after yielding is obtained according to the following formula: The horizontal hardening stiffness k3 under the vertical force change after the yield of the isolation bearing body in the third stage is obtained according to the following formula: The horizontal yield force Q of the seismic isolation bearing body is obtained according to the following formula: Among them, Q1 represents the first horizontal force at the first displacement X1 during the loading process, Q2 represents the first horizontal force at the second displacement X2, Q3 represents the second horizontal force at the third displacement X3 during the loading process, Q4 represents the second horizontal force at the fourth displacement X4, X1 represents the first displacement, X2 represents the second displacement, X3 represents the third displacement, Qd1 and Qd2 represent the two horizontal forces when the horizontal displacement is zero when the plane rectangular coordinate system is constructed with the horizontal displacement recorded in the third cycle as the horizontal coordinate and the horizontal force recorded in the third cycle as the vertical coordinate.

6. A shear hardening model of a variable vertical force seismic isolation rubber bearing, applied to the shear performance test method of a variable vertical force seismic isolation rubber bearing as claimed in any one of claims 1 to 5, characterized in that: include: Construct a plane rectangular coordinate system with horizontal displacement as the abscissa and horizontal force as the ordinate; The first horizontal force Q1 at the first displacement X1, the first horizontal force Q2 at the second displacement X2, the second horizontal force Q3 at the third displacement X3, the second horizontal force Q4 at the fourth displacement X4, the first displacement X1, the second displacement X2, the third displacement X3, and the fourth displacement X4 are marked in the plane rectangular coordinate system to construct a shear hardening model of the variable vertical force seismic isolation rubber bearing; wherein, X3 = -X1, X4 = -X2; The shear hardening model of the variable vertical force seismic isolation rubber bearing is divided into the first stage, the second stage and the third stage, and the vertical force F is calculated respectively.

7. The shear hardening model of variable vertical force seismic isolation rubber bearing according to claim 6 is characterized in that: The shear hardening model of the variable vertical force seismic isolation rubber bearing is divided into the first stage, the second stage and the third stage, and the vertical force F is calculated respectively, including: The vertical force in the first stage is obtained by the following formula: F = k1X(X≤Xy); The vertical force in the second stage is obtained by the following formula: F=k2X-k2X1+Q(Xy <X≤X1); The vertical force in the third stage is obtained by the following formula: F=k3X-(k3-k2)X1-k2Xy+Q ( X1 <X≤X2); k3=αk2; Among them, k1 is the stiffness of the isolation bearing body before yielding in the first stage, k2 is the horizontal stiffness under constant pressure after yielding in the second stage, k3 is the horizontal hardening stiffness under vertical force change after yielding in the third stage, Xy is the horizontal displacement, X1 is the first displacement, X2 is the second displacement, Q is the horizontal yield force of the isolation bearing body, and α is the strengthening coefficient, which is calculated based on the test data.

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