An embedded vibration table with expandable frequency and area for large load tests

Abstract

An embedded vibration table with large load test frequency and expandable area is composed of a vibration table body, the vibration table body is arranged in a building foundation with a long-range groove, long-stroke servo actuators are horizontally hinged at equal intervals between the four sides of the vibration table body and the side walls of the long-range groove, long-stroke servo actuators are vertically hinged at equal intervals between the bottom side of the vibration table body and the bottom of the long-range groove, and a short-range groove is also arranged at the upper end of the vibration table body; an excitation table is arranged in the short-range groove, short-stroke servo actuators are horizontally hinged at equal intervals between the four sides of the excitation table and the side walls of the short-range groove, and short-stroke servo actuators are vertically hinged at equal intervals between the bottom side of the excitation table and the bottom of the short-range groove. The present invention aims to provide an embedded vibration table that can enable a large-size, large-load vibration table to meet the test requirements of applying long-range and high-frequency loads at the same time and save space.

Description

Technical Field

[0001] The invention relates to the technical field of earthquake simulation, and in particular to an embedded vibration table with expandable frequency and area for heavy-load testing. Background Art

[0002] The shaking table test is a key simulation test method in the field of earthquake engineering to study the failure and damage mechanism of engineering structures under earthquake action. Its core content is to use the shaking table to reproduce the earthquake action. Therefore, the performance of the shaking table system is a necessary condition for realizing the engineering earthquake simulation test. In the engineering earthquake simulation test, the shaking table test of the original size or large scale engineering structure can more realistically reflect the failure and damage mechanism of the engineering structure under earthquake action, but this requires the shaking table to have the loading capacity of the original size or large scale engineering structure test model. Among them, large-scale water conservancy hub projects are important national infrastructures, and the study of their failure and damage mechanisms under earthquake action is an important part of improving my country's disaster prevention and mitigation capabilities. Due to the huge size of large-scale water conservancy hub projects, it is impossible to conduct full-scale shaking table tests. According to the principle of large scale, the test adopts a scale of 1:80, which requires the shaking table to have a large table size, high load capacity and high-frequency loading capacity of not less than 40Hz.

[0003] At present, it is difficult for the traditional vibration table system to take into account the requirements of large stroke and high frequency loading. That is, the vibration table with high frequency loading capability has a small table size, low load capacity and small loading stroke, while the vibration table with large size, large load and long stroke loading capability cannot perform high frequency loading. This makes it impossible to conduct large-scale engineering earthquake simulation tests on large-scale water conservancy projects. Summary of the invention

[0004] The purpose of the present invention is to overcome the deficiencies in the above-mentioned prior art and to provide an embedded vibration table that can enable a large-size, large-load vibration table to meet the test requirements of applying long stroke and high-frequency loads at the same time and save space.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] An embedded vibration table with large load test frequency and expandable area is composed of a vibration table body, which is arranged in a building foundation with a long-range groove, long-stroke servo actuators are horizontally hinged at equal intervals between the four sides of the vibration table body and the side walls of the long-range groove, long-stroke servo actuators are vertically hinged at equal intervals between the bottom side of the vibration table body and the bottom of the long-range groove, and a short-range groove is also opened at the upper end of the vibration table body; an excitation table is arranged in the short-range groove, short-stroke servo actuators are horizontally hinged at equal intervals between the four sides of the excitation table and the side walls of the short-range groove, and short-stroke servo actuators are vertically hinged at equal intervals between the bottom side of the excitation table and the bottom of the short-range groove; the short-stroke servo actuator and the long-stroke servo actuator are both electrically connected to a motion controller.

[0007] Furthermore, the stroke ratio of the long-stroke servo actuator to the short-stroke servo actuator is not less than 40, the maximum operating frequency of the long-stroke servo actuator is ≤25Hz, the maximum operating frequency of the short-stroke servo actuator is >40Hz, and the long-stroke servo actuator and the short-stroke servo actuator are both composed of hydraulic servo actuators.

[0008] Furthermore, a reinforcement layer hinged to the short-stroke servo actuator is fixedly provided on the inner wall of the short-stroke groove, and the reinforcement layer is composed of a steel plate; a seismic isolation layer alternately arranged with the short-stroke servo actuator is provided between the bottom side of the excitation platform and the reinforcement layer, and the seismic isolation layer is composed of a spring, an air cushion or a rubber cushion.

[0009] Furthermore, sealing plates are detachably provided between both sides of the reinforcement layer and the excitation platform.

[0010] Furthermore, the vibration table body and the excitation table are both welded from steel plates into a box-shaped honeycomb structure.

[0011] Furthermore, the table area of ​​the vibration table body is greater than 250 square meters, and the table area of ​​the excitation table is greater than 50 square meters.

[0012] Furthermore, the upper end surface of the excitation platform is at the same height as the upper end surface of the vibration platform body.

[0013] Furthermore, the building foundation is made of concrete, and the cross-section of the building foundation is rectangular.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The vibration table in the present invention can be used for engineering earthquake simulation tests. The vibration table body is embedded in the long-range groove of the building foundation, and the excitation table is embedded in the short-range groove of the vibration table body, which can save space to the maximum extent and realize the functional requirements of large size and large load. Moreover, through the short-stroke servo actuator and the long-stroke servo actuator, the test requirements of applying long-stroke and high-frequency loads can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] Figure 2 It is a cross-sectional schematic diagram of the vibration table body in the present invention.

[0018] Description of reference numerals:

[0019] 1-vibration table body, 2-excitation table, 3-building foundation, 11-short-stroke slot, 12-reinforcement layer, 13-sealing plate, 14-short-stroke servo actuator, 15-seismic isolation layer, 31-long-stroke slot, 32-long-stroke servo actuator. DETAILED DESCRIPTION

[0020] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0021] like Figure 1As shown, an embedded vibration table with large load test frequency and expandable area is composed of a vibration table body 1, which is arranged in a building foundation 3 with a long-stroke groove 31, and long-stroke servo actuators 32 are horizontally hinged at equal intervals between the four sides of the vibration table body 1 and the side walls of the long-stroke groove 31, and long-stroke servo actuators 32 are vertically hinged at equal intervals between the bottom side of the vibration table body 1 and the bottom of the long-stroke groove 31. A short-stroke groove 11 is also opened at the upper end of the vibration table body 1; an excitation table 2 is arranged in the short-stroke groove 11, and short-stroke servo actuators 14 are horizontally hinged at equal intervals between the four sides of the excitation table 2 and the side walls of the short-stroke groove 11, and short-stroke servo actuators 14 are vertically hinged at equal intervals between the bottom side of the excitation table 2 and the bottom of the short-stroke groove 11, and the inner wall of the short-stroke groove 11 is fixedly provided with a short-stroke servo actuator. A reinforcing layer 12 is hinged to the stroke servo actuator 14, and the reinforcing layer 12 is made of a steel plate; an isolation layer 15 is arranged between the bottom side of the excitation platform 2 and the reinforcing layer 12, and the isolation layer 15 is made of a rubber pad in this embodiment; the short-stroke servo actuator 14 and the long-stroke servo actuator 32 are both electrically connected to the motion controller; the stroke ratio of the long-stroke servo actuator 32 and the short-stroke servo actuator 14 is not less than 40, the maximum operating frequency of the long-stroke servo actuator 32 is ≤25Hz, and the maximum operating frequency of the short-stroke servo actuator 14 is >40Hz, and the long-stroke servo actuator 32 and the short-stroke servo actuator 14 are both made of hydraulic servo actuators; the building foundation 3 is made of concrete, and the cross-section of the building foundation 3 is rectangular.

[0022] like Figure 2 As shown, the vibration table body 1 and the excitation table 2 are both welded from steel plates into a box-shaped honeycomb structure, which can ensure the strength and rigidity of the vibration table body 1 and the excitation table 2. The table area of ​​the vibration table body 1 is greater than 250 square meters, and the table area of ​​the excitation table 2 is greater than 50 square meters, which can provide a sufficiently large table for large-scale engineering earthquake simulation experiments. Among them, the upper end surface of the excitation table 2 is at the same height as the upper end surface of the vibration table body 1, and a sealing plate 13 is detachably provided between the top sides of the reinforcement layer 12 and the top surface of the excitation table 2, so that the vibration table body 1, the excitation table 2 and the sealing plate 13 can form a flat table with the same height, which can expand the usable area of ​​the table and facilitate the earthquake test process.

[0023] During the test, long-stroke servo actuators 32 for horizontal movement are arranged around the vibration table body 1, and long-stroke servo actuators 32 for vertical movement are arranged at the bottom of the vibration table body 1, which can meet the long-stroke and low-frequency loading requirements during the test. Short-stroke servo actuators 14 for horizontal movement are arranged around the excitation table 2, and short-stroke servo actuators 14 for vertical movement are arranged at the bottom of the excitation table 2, which can meet the short-stroke and high-frequency loading requirements during the test. The vibration table body 1 and the excitation table 2 are connected to the actuators through a ball joint or a pin joint. The seismic isolation layer 15, which is alternately arranged with the short-stroke servo actuators 14 between the bottom side of the excitation table 2 and the reinforcement layer 12, can minimize the mutual influence of vibration between the vibration table body 1 and the excitation table 2. Moreover, the reinforcement layer 12 can further enhance the excitation table 2's ability to withstand the short-stroke servo actuators 14 running at high frequencies, and the building foundation 3 composed of concrete can have higher self-strength and rigidity.

[0024] The short-stroke servo actuator 14 and the long-stroke servo actuator 32 can be connected and controlled by a motion controller arranged outside the vibration table body 1. The motion controller can adopt a multi-channel motion controller ServoTest Pulsar or MTS 469D to control the long-stroke servo actuator 32 of the vibration table body 1 and the short-stroke servo actuator 14 of the excitation table 2 respectively, so as to realize the multi-degree-of-freedom motion of the two tables. When it is necessary to simulate high-frequency and low-frequency seismic waves at the same time, the sealing plate 13 is first removed from between the reinforcement layer 12 and the excitation layer 2, and then the frequency division excitation is input to the multi-channel motion controller, the vibration table body 1 will perform long-stroke low-frequency motion, and the excitation table 2 will perform short-stroke high-frequency motion relative to the vibration table body 1, so that the excitation table 2 contains seismic waves with high-frequency and low-frequency components at the same time, and finally accurately realizes seismic waves with a wider frequency range. When only low-frequency seismic waves need to be simulated, the sealing plate 13 can be installed and fixed between the reinforcing layer 12 and the excitation platform 2 to ensure a firm connection between the reinforcing layer 12 and the excitation platform 2. The multi-channel motion controller can then only control the operation of the long-stroke servo actuator 32 to facilitate the simulation of low-frequency seismic waves.

[0025] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An embedded vibration table with large load test frequency and expandable area, consisting of a vibration table body, characterized in that: The vibration table body is arranged in a building foundation with a long-range groove, long-stroke servo actuators are horizontally hinged at equal intervals between the four sides of the vibration table body and the side walls of the long-range groove, long-stroke servo actuators are vertically hinged at equal intervals between the bottom side of the vibration table body and the bottom of the long-range groove, and a short-range groove is also arranged at the upper end of the vibration table body; an excitation table is arranged in the short-range groove, short-stroke servo actuators are horizontally hinged at equal intervals between the four sides of the excitation table and the side walls of the short-range groove, and short-stroke servo actuators are vertically hinged at equal intervals between the bottom side of the excitation table and the bottom of the short-range groove; the short-stroke servo actuator and the long-stroke servo actuator are both electrically connected to the motion controller, and the upper end surface of the excitation table is at the same height as the upper end surface of the vibration table body; A reinforcing layer hinged to the short-stroke servo actuator is fixedly arranged on the inner wall of the short-stroke groove, and the reinforcing layer is composed of a steel plate; a seismic isolation layer alternately arranged with the short-stroke servo actuator is arranged between the bottom side of the excitation platform and the reinforcing layer, and the seismic isolation layer is composed of a spring, an air cushion or a rubber cushion; Sealing plates are detachably provided between the two sides of the reinforcement layer and the excitation platform.

2. The embedded vibration table with expandable frequency and area for large load test according to claim 1, characterized in that: The stroke ratio of the long-stroke servo actuator to the short-stroke servo actuator is not less than 40, the maximum operating frequency of the long-stroke servo actuator is ≤25Hz, and the maximum operating frequency of the short-stroke servo actuator is >40Hz. Both the long-stroke servo actuator and the short-stroke servo actuator are composed of hydraulic servo actuators.

3. The embedded vibration table with expandable frequency and area for large load test according to claim 1, characterized in that: The vibration table body and the excitation table are both welded from steel plates into a box-shaped honeycomb structure.

4. The embedded vibration table with expandable frequency and area for large load test according to claim 3, characterized in that: The table area of ​​the vibration table body is greater than 250 square meters, and the table area of ​​the excitation table is greater than 50 square meters.

5. The embedded vibration table with expandable frequency and area for large load test according to claim 1, characterized in that: The building foundation is made of concrete, and the cross section of the building foundation is rectangular.

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