Earthquake simulation test device for anti-seismic support hanger

Abstract

The utility model discloses an earthquake simulation test device for an anti-seismic support hanger. The earthquake simulation test device for the anti-seismic support hanger comprises a balancing weight, a simulation test frame, a vibration table and a dynamic data acquisition system, the balancing weight is mounted on the anti-seismic support hanger, and the anti-seismic support hanger is a full-scale test piece; the number of the anti-seismic support hangers is at least two, the structures of the at least two anti-seismic support hangers are the same, and the at least two anti-seismic support hangers are detachably installed on the simulation test frame through first bolts; the simulation test frame is used for mounting an anti-seismic support hanger, the height of the simulation test frame is greater than or equal to a preset height, and the simulation test frame is detachably connected with the vibration table through a second bolt; and the dynamic data acquisition system is matched with the vibration table, and is used for acquiring the dynamic response and related parameters of the anti-seismic support hanger in the earthquake simulation test process of the anti-seismic support hanger.

Description

Technical Field

[0001] The present application relates to the technical field of seismic support and hanger testing, and in particular to a seismic simulation testing device for seismic support and hanger. Background Art

[0002] Building seismic supports and hangers are used to limit the displacement of attached electromechanical engineering facilities, control the vibration of facilities, and transfer loads to various components or devices on the bearing structure. Seismic supports and hangers should provide reliable protection for building electromechanical engineering facilities during earthquakes and withstand earthquakes from any horizontal direction.

[0003] The existing simulation test framework can only test the scaled model of seismic supports and hangers, but cannot verify the full-scale specimens of seismic supports and hangers; and the existing framework and test method do not take into account the actual spacing and counterweight of the seismic supports and hangers, and no intermediate flexible load-bearing bracket is set. The actual counterweight includes water pipes, bridge frames and air ducts, which leads to poor accuracy of the seismic simulation test results of seismic supports and hangers obtained based on the scaled model of seismic supports and hangers. Utility Model Content

[0004] Based on this, in order to solve the above technical problems, a seismic simulation test device for seismic supports and hangers is provided, which is capable of performing seismic simulation tests on full-scale seismic supports and hangers.

[0005] An earthquake simulation test device for seismic support and hanger, characterized in that the device comprises a counterweight, a simulation test frame, a vibration table and a dynamic data acquisition system;

[0006] The counterweight block is installed on the seismic support and hanger, and the seismic support and hanger is a full-scale specimen;

[0007] The number of the seismic support and hanger brackets is at least two, the structures of at least two of the seismic support and hanger brackets are the same, and at least two of the seismic support and hanger brackets are detachably mounted on the simulation test frame by first bolts;

[0008] The simulation test frame is used to install the seismic support and hanger, the height of the simulation test frame is greater than or equal to the preset height, and the simulation test frame is detachably connected to the vibration table through a second bolt;

[0009] The dynamic data acquisition system cooperates with the vibration table, and the dynamic data acquisition system is used to collect the dynamic response and related parameters of the seismic support and hanger during the seismic simulation test of the seismic support and hanger.

[0010] In the above scheme, optionally, when the weight of the counterweight block is greater than the first preset weight and the weight of the counterweight block is less than the second preset weight, the number of the seismic support and hanger brackets is two, and the distance between the two seismic support and hanger brackets is greater than or equal to 6 meters; wherein the first preset weight is 300 kilograms.

[0011] In the above scheme, further optionally, when the weight of the counterweight block is greater than the second preset weight, the number of the seismic support and hanger brackets is four, and the distance between any two of the four seismic support and hanger brackets is greater than or equal to 3 meters; wherein the second preset weight is 600 kilograms.

[0012] In the above solution, further optionally, the preset height is 3 meters.

[0013] In the above scheme, further optionally, the natural frequency of the simulation test frame is greater than or equal to 12 Hz, and the simulation test frame maintains an elastic state during the earthquake simulation test of the seismic support and hanger.

[0014] In the above scheme, further optionally, the vibration table is a numerically controlled simulated earthquake vibration table with an iterative correction function.

[0015] In the above scheme, further optionally, the dynamic range of the dynamic data acquisition system should be greater than 60dB, the signal-to-noise ratio of the dynamic data acquisition system should be better than -40dB, and the accuracy of the dynamic data acquisition system should be higher than 0.5% of the full scale.

[0016] The utility model has at least the following beneficial effects:

[0017] The utility model is based on further analysis and research on the problems of the prior art, and recognizes that in the prior art, the accuracy of the seismic simulation test results of the seismic support and hanger obtained according to the scaled model of the seismic support and hanger is poor. The seismic simulation test device of the seismic support and hanger of the present application is adopted, including a counterweight block, a simulation test frame, a vibration table and a dynamic data acquisition system; the counterweight block is installed on the seismic support and hanger, and the seismic support and hanger is a full-scale test piece; the number of seismic supports and hangers is at least two, the structures of at least two seismic supports and hangers are the same, and at least two seismic supports and hangers are detachably installed on the simulation test frame by a first bolt; the simulation test frame is used to install the seismic supports and hangers, the height of the simulation test frame is greater than or equal to the preset height, and the simulation test frame is detachably connected to the vibration table by a second bolt; the dynamic data acquisition system cooperates with the vibration table, and the dynamic data acquisition system is used to collect the dynamic response and related parameters of the seismic support and hanger during the seismic simulation test of the seismic support and hanger. Among them, the simulation test frame is made of H-shaped steel and reinforced to ensure that the stiffness of the simulation test frame is much greater than the stiffness of the seismic support and hanger specimen during the test. Full-scale seismic supports and hangers are directly used, and counterweights are installed on the full-scale seismic supports and hangers for earthquake simulation tests, avoiding the use of scaled models of seismic supports and hangers, which effectively improves the accuracy of earthquake simulation test results. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram of the connection structure of a seismic support and hanger bracket and a simulation test frame provided in one embodiment of the utility model. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] In the embodiments of the present application, Figure 1 As shown, a seismic simulation test device for seismic supports and hangers is provided, including a counterweight, a simulation test frame, a vibration table and a dynamic data acquisition system;

[0021] The counterweight block is installed on the seismic support and hanger, and the seismic support and hanger is a full-scale specimen;

[0022] The number of the seismic support and hanger brackets is at least two, the structures of at least two of the seismic support and hanger brackets are the same, and at least two of the seismic support and hanger brackets are detachably mounted on the simulation test frame by first bolts;

[0023] The simulation test frame is used to install the seismic support and hanger, the height of the simulation test frame is greater than or equal to the preset height, and the simulation test frame is detachably connected to the vibration table through a second bolt;

[0024] The dynamic data acquisition system cooperates with the vibration table, and the dynamic data acquisition system is used to collect the dynamic response and related parameters of the seismic support and hanger during the seismic simulation test of the seismic support and hanger.

[0025] In this embodiment, the dynamic data acquisition system includes a plurality of acceleration sensors, which can be arranged in Figure 1 At MA1, MA2, MA3, MA4, MA5 and MA6 as shown.

[0026] In one embodiment of the present application, when the weight of the counterweight block is greater than the first preset weight and the weight of the counterweight block is less than the second preset weight, the number of the seismic support and hanger brackets is two, and the distance between the two seismic support and hanger brackets is greater than or equal to 6 meters; wherein the first preset weight is 300 kilograms.

[0027] In one embodiment of the present application, when the weight of the counterweight block is greater than the second preset weight, the number of the seismic support and hanger brackets is four, and the distance between any two of the four seismic support and hanger brackets is greater than or equal to 3 meters; wherein the second preset weight is 600 kilograms.

[0028] In one embodiment of the present application, the preset height is 3 meters.

[0029] In one embodiment of the present application, the natural frequency of the simulation test frame is greater than or equal to 12 Hz, and the simulation test frame maintains an elastic state during the earthquake simulation test of the seismic support and hanger.

[0030] In one embodiment of the present application, the vibration table is a numerically controlled simulated earthquake vibration table with an iterative correction function.

[0031] In one embodiment of the present application, the dynamic range of the dynamic data acquisition system should be greater than 60 dB, the signal-to-noise ratio of the dynamic data acquisition system should be better than -40 dB, and the accuracy of the dynamic data acquisition system should be higher than 0.5% of the full scale.

[0032] In this embodiment, it should be noted that the simulation test frame is used to simulate the main structure of the seismic support and hanger test piece, and should be able to meet the installation and measurement requirements of the seismic support and hanger test piece, and the height should not be less than 3 meters. The seismic support and hanger are connected to the simulation test frame by bolts.

[0033] In this embodiment, the simulation test frame should have appropriate stiffness (self-vibration frequency is not less than 12 Hz) and load-bearing capacity, and should maintain an elastic state during the test.

[0034] In this embodiment, the simulation test frame should be rigidly connected to the vibration table surface by bolts.

[0035] In this embodiment, the seismic support and hanger specimens should be representative of the project and should preferably be full-scale components.

[0036] In this embodiment, two sets of components of the same structural type should be provided for the seismic support and hanger specimens for testing.

[0037] In this embodiment, the installation distance between two sets of seismic support and hanger assemblies should not be less than 6 meters.

[0038] In this embodiment, the seismic support and hanger assembly should be installed with counterweights according to the designed bearing capacity, and the counterweight mass should not be less than 300kg. When the counterweight mass is greater than 600kg, two sets of load-bearing support and hanger brackets should be added, and the installation spacing of the load-bearing support and hanger brackets should not be less than 3 meters.

[0039] In this embodiment, the vibration table should comply with the provisions of JGJ / T 101, and a numerically controlled simulated earthquake vibration table with iterative correction function should be selected; the size and space of the vibration table surface should meet the installation requirements of the simulation test frame and seismic support and hanger components; the load and anti-overturning capacity of the vibration table surface should meet the test requirements.

[0040] In this embodiment, the dynamic data acquisition system should match the performance of the simulated earthquake vibration table and should have the ability to collect the dynamic response of the seismic support and hanger components and related parameters in real time; the operating frequency range of the dynamic data acquisition system should have a lower limit lower than 1 / 10 of the lowest main frequency component of the test earthquake record and an upper limit greater than the highest effective frequency component value; the dynamic range of the dynamic data acquisition system should be greater than 60dB, and the signal-to-noise ratio should be better than -40dB; the accuracy of the dynamic data acquisition system should not be less than 0.5% of the full scale; the measuring sensors and their connecting wires should have good mechanical impact resistance and be easy to install and disassemble, and the mass and volume of the sensors should not affect the dynamic characteristics of the test piece; the connecting wires of the measuring sensors should use shielded cables.

[0041] In the specific use of the present application, first, before the earthquake simulation test, the first dynamic characteristic parameters and dynamic response parameters of the seismic support and hanger are measured; wherein the first dynamic characteristic parameters include a first natural frequency parameter and a first damping ratio parameter, and the dynamic response parameters include an acceleration parameter, a displacement parameter and a strain parameter; secondly, the seismic support and hanger is subjected to an earthquake simulation test by means of a vibration table; finally, the second dynamic characteristic parameters of the seismic support and hanger are measured after the earthquake simulation test by means of a white noise excitation method; wherein the second dynamic characteristic parameters include a second natural frequency parameter and a second damping ratio parameter.

[0042] It should be noted that the vibration table input depends on the type of the proposed site, the seismic fortification intensity and the design earthquake grouping parameters, and the vibration table input conforms to the proposed site demand response spectrum of the seismic support and hanger, and an artificial wave that conforms to the site demand spectrum is used as input; the acceleration time history selects the artificial seismic motion fitted according to the characteristics of the proposed site, and the duration of the strong earthquake segment is greater than the preset duration, the peak value of the table input acceleration is greater than or equal to the zero-period acceleration ZPA of the response spectrum, and the peak values ​​of the three-way input seismic motion are determined according to a preset ratio; the test response spectrum should basically envelope the required response spectrum, and the peak value of the table input acceleration is calculated according to the formula ZPA=ηα; wherein η is the amplification factor and α is the maximum unidirectional acceleration peak value.

[0043] In this embodiment, the duration of the strong earthquake segment is greater than a preset duration, which is 20 seconds.

[0044] In this embodiment, the peak values ​​of the three-way input earthquake motions are determined according to a preset ratio, which is 1:0.85:0.65.

[0045] In this embodiment, the vibration table has a damping ratio of 2% or 5% of the required response spectrum, and uses an artificial wave that meets the site requirement spectrum as input.

[0046] In this embodiment, the dynamic characteristics such as the natural frequency and damping ratio of the seismic support and hanger assembly, as well as the dynamic responses such as acceleration, displacement, and strain should be measured as needed; the arrangement and number of acceleration sensors, displacement sensors, and strain gauges should be determined according to measurement needs, and they should be preferentially arranged in locations with larger acceleration responses; the sensors should be in reliable contact with the specimen, and the connecting wires should be tied to the specimen.

[0047] In this embodiment, the white noise excitation method is used to measure the dynamic characteristics of the component before and after the seismic test. The frequency range of the white noise should be 0.5Hz to 100Hz, which should cover the natural frequency range of the component, and the acceleration amplitude should be 1m / s 2 The effective duration should not be less than 120s. The tabletop white noise excitation can be carried out by three-way simultaneous loading or one-way loading.

[0048] In this embodiment, the vibration table input should be selected according to parameters such as the type of the proposed site, seismic fortification intensity and design earthquake grouping, and should meet the site demand response spectrum. The damping ratio should be 2% or 5% of the required response spectrum, and artificial waves that meet the site demand spectrum should be used as input. The acceleration time history should be selected according to the artificial seismic motion fitted according to the characteristics of the proposed site. The duration of the strong earthquake section (referring to the time history from the beginning of the curve to the maximum value of 25% to the final drop to the maximum value of 25%) should be greater than 20s. The peak value of the table input acceleration should not be less than the zero period acceleration (ZPA) of the response spectrum, and the peak value of the three-way input seismic motion should be determined according to 1:0.85:0.65. The test response spectrum should basically envelope the required response spectrum. The peak value of the table input acceleration should be calculated according to the formula ZPA=ηα, where: η is the amplification factor, which is 1.6 when the project cannot provide it; α is the maximum unidirectional acceleration peak, and the values ​​are shown in Table 1.

[0049] Table 1 Maximum unidirectional acceleration peak value of the vibration table input earthquake acceleration time history (meters per square second)

[0050]

[0051] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. An earthquake simulation test device for seismic support and hanger, characterized in that: The device includes a counterweight, a simulation test frame, a vibration table and a dynamic data acquisition system; The counterweight block is installed on the seismic support and hanger, and the seismic support and hanger is a full-scale specimen; The number of the seismic support and hanger brackets is at least two, the structures of at least two of the seismic support and hanger brackets are the same, and at least two of the seismic support and hanger brackets are detachably mounted on the simulation test frame by first bolts; The simulation test frame is used to install the seismic support and hanger, the height of the simulation test frame is greater than or equal to the preset height, and the simulation test frame is detachably connected to the vibration table through a second bolt; The dynamic data acquisition system cooperates with the vibration table, and the dynamic data acquisition system is used to collect the dynamic response and related parameters of the seismic support and hanger during the seismic simulation test of the seismic support and hanger.

2. The earthquake simulation test device for seismic supports and hangers according to claim 1, characterized in that: When the weight of the counterweight block is greater than the first preset weight and the weight of the counterweight block is less than the second preset weight, the number of the seismic support and hanger brackets is two, and the distance between the two seismic support and hanger brackets is greater than or equal to 6 meters; wherein the first preset weight is 300 kilograms.

3. The earthquake simulation test device for seismic supports and hangers according to claim 2, characterized in that: When the weight of the counterweight block is greater than the second preset weight, the number of the seismic support and hanger brackets is four, and the distance between any two of the four seismic support and hanger brackets is greater than or equal to 3 meters; wherein the second preset weight is 600 kilograms.

4. The earthquake simulation test device for seismic supports and hangers according to claim 1, characterized in that: The preset height is 3 meters.

5. The earthquake simulation test device for seismic supports and hangers according to claim 1, characterized in that: The natural frequency of the simulation test frame is greater than or equal to 12 Hz, and the simulation test frame maintains an elastic state during the earthquake simulation test of the seismic support and hanger.

6. The earthquake simulation test device for seismic supports and hangers according to claim 1, characterized in that: The vibration table is a numerically controlled earthquake simulation vibration table with an iterative correction function.

7. The earthquake simulation test device for seismic supports and hangers according to claim 1, characterized in that: The dynamic range of the dynamic data acquisition system should be greater than 60dB, the signal-to-noise ratio of the dynamic data acquisition system should be better than -40dB, and the accuracy of the dynamic data acquisition system should be higher than 0.5% of the full scale.

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