Dynamic test device for frame structure with viscous damper

Abstract

The application relates to a dynamic test device of a frame structure with a viscous damper, which comprises a test piece fixing device, a test piece loading device, a test piece data acquisition system, a viscous damper fixing device and a viscous damper data acquisition system. When the horizontal actuator loads in the test piece loading device, the horizontal acting force is output according to a certain speed, the viscous damper generates damping force and relative displacement, the effect of deformation energy dissipation of the speed type viscous damper in the test process is realized, then the data of the whole test piece and the damper monomer can be collected simultaneously by increasing the sensor on the damper, and the most direct basis for quantitatively analyzing the damping effect of the damping structure is provided. The mechanical data of the viscous damper and the whole structure are simultaneously acquired, and the application provides a test device and method which can simultaneously and accurately analyze the whole damping structure and the damping component monomer with the attached speed type damper.

Description

Technical Field

[0001] This invention relates to the field of structural engineering testing equipment technology research, and to a dynamic testing device with a frame structure featuring a viscous damper, which is particularly suitable for dynamic loading tests with a frame structure featuring a viscous damper. Background Technology

[0002] The output force (damping force) and displacement (relative displacement) of viscous dampers are crucial data for structural design and numerical analysis. However, while the overall force-displacement data of the structure are generally easy to measure, the output force (damping force) and displacement (relative displacement) of the damper itself are difficult to observe. Due to limitations in current testing methods, existing tests, both domestically and internationally, typically observe the seismic performance of specimens (frames / nodes) after the addition of viscous dampers, limiting the verification of damping effects to qualitative assessment. Although test results can demonstrate that viscous dampers play a damping role, their dynamic performance throughout the damping process cannot be quantitatively described. The damping force and relative displacement of the viscous damper itself are not well understood. Therefore, it is impossible to quantitatively test the mechanical performance of the damping device. Consequently, it is impossible to analyze the quantitative distribution of vibration energy when the structure and damper work together, thus hindering the design optimization of the structure-damper pairing to achieve better damping effects. Summary of the Invention

[0003] This invention provides a dynamic testing device with a viscous damper structure, enabling real-time testing of the overall load-displacement data and the damping force-relative displacement data of the viscous damper in structural tests, effectively solving the technical problem that it is difficult to test the specimen and the viscous damper simultaneously in structural tests.

[0004] The objective of this invention and the technical problem it solves are achieved by the following technical solution. A dynamic testing device with a viscous damper frame structure, according to this invention, includes a test piece consisting of two columns and a crossbeam connected between the two columns. The crossbeam of the test piece is also equipped with an out-of-plane deformation limiting device to prevent lateral deformation. A horizontal actuator for applying a horizontal force to the test piece is provided on a reaction wall on one side of the test piece, and a load sensor is connected to the output end of the horizontal actuator. A multi-displacement sensor is provided at the end of the test piece away from the horizontal actuator. A velocity-type viscous damper is provided between the two columns and the crossbeam of the test piece. This velocity-type viscous damper includes tension and compression sensors for detecting the force it bears. A displacement sensor for detecting the displacement of the viscous damper is also fixed on the columns, and the displacement sensor is connected to the cylinder of the viscous damper via a connecting rod. The load sensor, multi-displacement sensor, displacement sensor, and tension / compression sensor are all connected to a controller, which can also control the movement of the horizontal actuator.

[0005] The objectives of this invention and the technical problems it addresses can be further achieved by the following technical measures.

[0006] In the aforementioned dynamic testing device with a frame structure featuring a viscous damper, the crossbeam and column are connected to the connecting lugs at both ends of the viscous damper via fixed supports.

[0007] In the aforementioned dynamic testing device with a frame structure featuring a viscous damper, the displacement sensor is fixed on the support of the column connecting the viscous damper to be tested.

[0008] In the aforementioned dynamic testing device with a viscous damper frame structure, the controller controls the horizontal actuator to apply a horizontal force through a loading method that controls both displacement and frequency, so that the displacement and frequency of the horizontal actuator are both kept within a set range.

[0009] In the aforementioned dynamic testing device with a viscous damper frame structure, the output frequency of the horizontal actuator is maintained between 0.75 and 2.5 Hz.

[0010] In the aforementioned dynamic testing device with a viscous damper frame structure, the loading regime of the horizontal actuator adopts a triangular wave or a sine wave.

[0011] The aforementioned dynamic testing device with a viscous damper frame structure includes an out-of-plane deformation limiting device comprising a reaction support, two sets of lateral connecting assemblies, two sets of intermediate assemblies, and at least two sets of pulley assemblies. The reaction support is fixed to one side of the test piece. One side of each of the two sets of lateral connecting assemblies is connected to the reaction support, and the other side is connected to the two sets of intermediate connecting assemblies. The two sets of intermediate connecting assemblies are relatively distributed on both sides of the test piece, and pulley assemblies are fixed on their inner sides. The two sets of intermediate connecting assemblies can be adjusted to position the pulleys of the pulley assemblies pressing against the two sides of the crossbeam of the test piece.

[0012] In the aforementioned dynamic testing device with a viscous damper frame structure, the lateral connection assembly is fixed to one side of the reaction support by bolts, and the holes connecting the lateral connection assembly and the reaction support are several elongated holes distributed and extending along the height direction.

[0013] The aforementioned dynamic testing device with a viscous damper frame structure includes a lateral connection assembly comprising a vertical connection plate for connecting to a reaction support, a screw fixed to one side of the vertical connection plate, and several nuts on the screw. The intermediate connection assembly is connected to the lateral connection assembly via the screw and is locked and positioned with the lateral connection assembly via the nuts.

[0014] The aforementioned dynamic testing device with a viscous damper frame structure includes an intermediate connecting component comprising two vertically extending perforated columns and a non-perforated column connected between the two perforated columns. The holes on the perforated columns allow the screws of the corresponding lateral connecting components to pass through, and the screws are locked and positioned by nuts.

[0015] Compared with existing technologies, this invention has significant advantages and beneficial effects. Through the above technical solution, this invention achieves considerable technological advancement and practicality, and has broad industrial application value, possessing at least the following advantages:

[0016] Compared to existing technologies, this invention achieves "quantitative" measurement of vibration reduction devices with viscous dampers. Overall specimen data (load-displacement) and individual viscous damper data (damping force-relative displacement) can be acquired in real time using load sensors, multiple displacement gauge sensors, damper tension / compression sensors, and damper displacement sensors.

[0017] This invention achieves the effect of deformation and energy dissipation of a velocity-type viscous damper during the test by using a dynamic control loading method. Then, by adding a sensor to the damper, data of the whole specimen and the individual damper can be collected simultaneously, providing the most direct basis for the quantitative analysis of the damping effect of the damping structure.

[0018] This invention simultaneously acquires mechanical data of the viscous damper and the overall structure, and proposes an experimental device and method for simultaneously and accurately performing mechanical analysis on the overall damping structure with attached velocity dampers and individual damping components. Attached Figure Description

[0019] Figure 1 This is a three-dimensional schematic diagram of the dynamic testing device with a viscous damper frame structure according to the present invention;

[0020] Figure 2 This is a front view of the dynamic testing device with a viscous damper frame structure according to the present invention;

[0021] Figure 3 This is a schematic diagram of the out-of-plane deformation limiting device of the present invention.

[0022] [Explanation of Key Component Symbols]

[0023] 11. Bottom fixing device

[0024] 12. Out-of-plane deformation limiting device

[0025] 21. Horizontal actuator

[0026] 22. Reaction Wall

[0027] 23. Screw connection assembly

[0028] 31. Multi-displacement sensor

[0029] 32. Load sensor

[0030] 41. Upper support

[0031] 42. Lower support

[0032] 43. Connectors

[0033] 51. Tension / Compression Sensor

[0034] 52. Load sensor

[0035] 53. Connecting rod

[0036] 60. Test piece

[0037] 61. Viscous damper

[0038] 120. Lateral connection assembly

[0039] 121. Vertical connecting plate

[0040] 122. Nut

[0041] 123. Screw

[0042] 130. Intermediate Components

[0043] 140. Pulley assembly

[0044] 131. Perforated column

[0045] 132. Column without holes

[0046] 141. Bolt

[0047] 142. Shortcomings

[0048] 143. Pulley connecting plate

[0049] 144. Pulley

[0050] 150. Reaction Bracket Detailed Implementation

[0051] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the following detailed description, in conjunction with the accompanying drawings and preferred embodiments, describes the specific implementation, structure, features and effects of the dynamic testing device with a viscous damper frame structure proposed according to the present invention.

[0052] Please see Figure 1-3This is a schematic diagram of the various parts of the dynamic testing device with a viscous damper frame structure according to the present invention. The dynamic testing device includes a test specimen 60, a specimen fixing device, a specimen loading device, a specimen data acquisition system, a viscous fluid damper fixing device, and a viscous fluid damper data acquisition system.

[0053] The test specimen 60 includes two columns and a crossbeam connected between the two columns. The specimen fixing device includes columns for fixing the test specimen 60. To prevent out-of-plane deformation of the crossbeam of the test specimen 60 from affecting the test results, the specimen fixing device also includes at least one out-of-plane deformation limiting device 12 for limiting the two sides of the crossbeam to prevent out-of-plane instability.

[0054] The specimen loading device includes a horizontal actuator 21, a reaction wall 22, and a screw connection assembly 23, wherein the reaction wall 22 is integrated with the ground through a pre-embedded foundation. One end of the horizontal actuator 21 is fixed to the reaction wall 22, and the other end is connected to the screw connection assembly 23, through which power is output to the specimen 60 under test. The screw connection assembly 23 is connected to the beam of the specimen 60 under test by bolts to transfer horizontal loads.

[0055] The viscous damper 61 is a velocity-type viscous damper, which includes a cylinder, a tension / compression sensor 51, and a connecting lug at one end. The tension / compression sensor 51 is located between the cylinder and the connecting lug on one side and is used to measure the tension and compression force borne by the viscous damper 61.

[0056] The viscous damper 61 is supported between the crossbeam and column of the test piece 60 by a damping fixing device. Specifically, the damper fixing device includes an upper support 41 and a lower support 42, wherein the upper support 41 is fixed at a predetermined position at the bottom of the crossbeam of the test piece 60, and the lower support 42 is fixed at a predetermined position inside the column of the test piece 60. The connecting lug on one side of the viscous damper 61 is aligned and connected to the double-eared fork of the upper support 41 through a connector 43, and the connecting lug on the other side is aligned and connected to the double-eared fork of the lower support 42 through a connector 43. In this embodiment, the connector 43 is a bolt or a mating steel pin and nut, but is not limited to these.

[0057] In this embodiment, stiffening ribs need to be installed at the bottom of the beam and at the corresponding positions of the column and support. When the test specimen is a reinforced concrete structure, embedded plates are built into the beam-column corresponding positions, and the upper and lower supports can be connected to the embedded plates by bolts and welding.

[0058] The damper data acquisition system includes a tension / compression sensor 51 and a displacement sensor 52. The tension / compression sensor 51 collects the tension and compression forces acting on the viscous damper 61. The displacement sensor 52 is fixed to the lower support 42 and connected to the cylinder of the viscous damper 61 via a connecting rod 53, used to detect the displacement of the cylinder. Specifically, one end of the connecting rod 53 is bolted to the displacement sensor 52, and the other end is bolted to the cylinder of the viscous damper 61. Both the tension / compression sensor 51 and the displacement sensor 52 are connected to a controller via data cables, and the controller processes the data.

[0059] The specimen data acquisition system includes a multi-displacement sensor 31 and a load sensor 32. The multi-displacement sensor 31 is fixed at the top of a column or beam at the end of the specimen 60 away from the horizontal actuator 21, and is used to detect the displacement of the specimen 60. The load sensor 32 is located between the horizontal actuator 21 and the screw connection assembly 23, and is used to detect the load output by the horizontal actuator 21.

[0060] Both the multi-displacement sensor 31 and the load sensor 32 are connected to the controller via sensor wires, and the controller processes the collected data.

[0061] During the test loading, due to the use of a velocity-type viscous damper, dynamic loading controlled by displacement and frequency is required to ensure the damper effectively dissipates energy. The movement of the horizontal actuator 21 in this invention is controlled by a controller, which employs a loading method that combines velocity and displacement control to apply a horizontal force to the actuator 21. The viscous damper generates damping force and relative displacement as the specimen deforms. Data from the multi-displacement sensor 31, load sensor 32, tension / compression sensor 51, and displacement sensor 52 are all transmitted to the controller. The processor obtains the overall load F, overall displacement Δ, and damper output force F of the specimen based on this data. c Relative displacement Δ of damper c The data, ultimately F and Δ, can be used to plot the overall characteristic curve of the specimen, while F c and Δ c Characteristic curves of viscous dampers can be plotted, providing quantitative basis for studying the performance changes of specimens and viscous dampers during the experiment.

[0062] In this embodiment of the invention, when the horizontal actuator 21 is loaded, it performs displacement control while outputting a horizontal force at a certain frequency. The horizontal force is output at a relatively high frequency within a large displacement amplitude, and both the displacement and frequency must reach a set range. Preferably, the actuator output frequency is maintained between 0.75 and 2.5 Hz.

[0063] Preferably, the loading and braking of the horizontal actuator adopts a triangular wave or a sine wave, the frequency of which is calculated from the correspondence between displacement and acceleration, and the load cycle is 3-5 times for each working condition during the loading process.

[0064] The loading regime first determines the loading displacement according to the inter-story drift angle limit specified in the seismic design code and the dimensions of the test specimen. Then, the actuator loading frequency is determined based on the required acceleration and velocity. The acceleration and velocity are determined according to different seismic intensity levels in the "China Seismic Intensity Scale". Each loading condition can be cycled 3-5 times as needed.

[0065] In this embodiment of the invention, when the specimen deforms and displaces under dynamic action, the viscous damper generates damping force and relative displacement. The corresponding sensing system installed on the viscous damper generates force and displacement signals, which are transmitted to the controller via a data line.

[0066] In this embodiment, the out-of-plane deformation limiting device 12 includes a reaction support 150, two sets of lateral connecting components 120, two sets of intermediate components 130, and at least one set of pulley components 140. The reaction support 150 is fixed on one side of the test piece 60, and the reaction supports 150 of different out-of-plane deformation limiting devices 12 are distributed on the same side of the test piece 60.

[0067] The lateral connection assembly 120 includes a vertical connecting plate 121 for connection and fixation with the reaction support 150, a transverse screw 123 with one end fixed to the side of the vertical connecting plate 121, and a plurality of nuts 122 threaded onto the screw 123. In this embodiment, a single screw 123 has five nuts 122, one of which is used to lock the screw 123 to the vertical connecting plate 121. The vertical connecting plate 121 has a plurality of positioning screw holes along its height direction for bolt connection and fixation with the reaction support 150. In this embodiment, the height of the vertical connecting plate 121 is adjustable, and the connection height of the vertical connecting plate 121 can be selected according to the height of the specimen to enhance the applicability of the limiting device. Preferably, the positioning screw holes are elongated holes extending along the height direction, but are not limited to this.

[0068] The intermediate connecting assembly 130 includes two vertically extending perforated columns 131 and a non-perforated column 132 connecting the two perforated columns 131. The two sets of intermediate connecting assemblies 130 are arranged parallel to each other on both sides of the crossbeam of the test piece 60, forming a rectangular frame structure. During assembly, the screw 123 of one set of lateral connecting assemblies 120 passes through a through hole on one side of the perforated column 131 of the two intermediate connecting assemblies 130, and is locked and positioned with the perforated column 131 by a nut on the screw 123; the screw 123 of the other set of lateral connecting assemblies 120 passes through a through hole on the other side of the perforated column 131 of the two opposing intermediate connecting assemblies 130, and is locked and positioned with the perforated column by a nut on the screw 123, thereby completing the assembly of the intermediate connecting assembly 130 and the lateral connecting assembly 120.

[0069] The pulley assembly 140 includes a pulley connecting plate 143 fixed to a perforated column 132 of the intermediate connecting assembly 130. Each pulley connecting plate 143 has a pulley 144 rotatably mounted at its front end. During limiting, the position of the intermediate connecting assembly 130 on the screw can be adjusted so that the pulleys 144 of the pulley assembly 140 press against the side of the crossbeam of the test piece 60. Since the two sets of intermediate connecting assemblies 130 are arranged opposite each other, the pulley assemblies 140 mounted on the perforated columns 132 of the two sets of intermediate connecting assemblies 130 can press against both sides of the crossbeam. Furthermore, the contact between the pulley assembly 140 and the crossbeam is a rotating abutment, effectively avoiding the influence of friction on the test.

[0070] In the out-of-plane deformation limiting device 12, at least two sets of pulley assemblies 140 are provided on the non-perforated column 132 of the two sets of opposite intermediate connecting components 130 forming a frame structure, and the pulley assemblies 140 on the two sets of intermediate connecting components 130 are also symmetrically distributed to form at least one clamping pair, thereby achieving clamping and limiting on both sides of the crossbeam of the test piece 60.

[0071] In this embodiment, the pulley assembly 140 further includes two short plates 142 and studs and nuts for connecting and adjusting the spacing between the two short plates 142. One of the short plates 142 is fixed to the tail of the pulley connecting plate 143. The pulley assembly 140 is clamped on both sides of the non-perforated post 132 of the intermediate connecting assembly 130 by the two short plates 142, and is pressed and fixed on the non-perforated post 132 by adjusting the studs and nuts. Specifically, the studs have two sets distributed perpendicular to the sliding direction of the pulley 144, and the distance between the two sets of studs is greater than the vertical width of the non-perforated post 132. The arrangement of the short plates and studs in this embodiment allows for adjustment of the distribution position and number of the pulley assembly 140 on the intermediate connecting assembly 130.

[0072] In this embodiment, the pulley 144 is rotatably mounted on the front end of the pulley connecting plate 143 by bolt 141. Specifically, the pulley 144 is arranged parallel to the front end of the pulley connecting plate 143, and the bolt 141 passes through the shaft hole of the pulley connecting plate 143 and the pulley 144, thereby realizing the rotational setting of the pulley 144.

[0073] The sliding direction of the pulley 144 of the pulley assembly 140 is perpendicular to that of the short plate 142, so that after it is fixed by the short plate, the pulley 144 can vertically press against the side of the crossbeam of the test piece 60 and can rotate relative to the crossbeam along the extension direction of the crossbeam.

[0074] In this embodiment, two out-of-plane deformation limiting devices 12 are provided, which are distributed at intervals along the extension direction of the crossbeam of the test piece 60, and the reaction force support 150 of the out-of-plane deformation limiting device 12 is located on the same side of the crossbeam.

[0075] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A dynamic testing device with a frame structure featuring a viscous damper, characterized in that: The test specimen comprises two columns and a crossbeam connecting the two columns. The crossbeam is equipped with an out-of-plane deformation limiting device to prevent lateral deformation. A horizontal actuator is mounted on a reaction wall on one side of the test specimen to apply a horizontal force. A load sensor is connected to the output end of the horizontal actuator. A multi-displacement sensor is located at the end of the test specimen furthest from the horizontal actuator. A velocity-type viscous damper is positioned between the two columns and the crossbeam. This velocity-type viscous damper includes tension and compression sensors to detect the force it bears. A displacement sensor is also fixed on the columns to detect the displacement of the viscous damper, and this displacement sensor is connected to the cylinder of the viscous damper via a connecting rod. The load sensor, multi-displacement sensor, displacement sensor, and tension / compression sensor are all connected to a controller, which also controls the movement of the horizontal actuator. The controller controls the horizontal actuator to apply a horizontal force through a loading method that combines displacement and frequency control, ensuring that the displacement and frequency of the horizontal actuator remain within a set range, allowing the viscous damper to dissipate energy.

2. The dynamic testing device with a viscous damper frame structure according to claim 1, characterized in that: The beam and column are connected to the connecting lugs at both ends of the viscous damper via fixed supports.

3. The dynamic testing device with a viscous damper frame structure according to claim 2, characterized in that: The displacement sensor is fixed on the support of the column connecting the viscous damper to be detected.

4. The dynamic testing device with a viscous damper frame structure according to claim 1, characterized in that: The output frequency of the horizontal actuator is maintained between 0.75 and 2.5 Hz.

5. The dynamic testing device with a viscous damper frame structure according to claim 4, characterized in that: The loading mechanism of the horizontal actuator adopts a triangular wave or a sine wave.

6. The dynamic testing device with a viscous damper frame structure according to claim 1, characterized in that: The out-of-plane deformation limiting device includes a reaction support, two sets of lateral connecting components, two sets of intermediate components, and at least two sets of pulley assemblies. The reaction support is fixed on one side of the test piece. One side of each of the two sets of lateral connecting components is connected to the reaction support, and the other side is connected to the two sets of intermediate connecting components. The two sets of intermediate connecting components are distributed on both sides of the test piece, and pulley assemblies are fixed on their inner sides. The two sets of intermediate connecting components can be adjusted to position the pulleys of the pulley assemblies pressing against the two sides of the crossbeam of the test piece.

7. The dynamic testing device with a viscous damper frame structure according to claim 6, characterized in that: The lateral connection assembly is fixed to one side of the reaction support by bolts, and the holes connecting the lateral connection assembly to the reaction support are a number of elongated holes distributed and extending along the height direction.

8. The dynamic testing device with a viscous damper frame structure according to claim 6, characterized in that: The lateral connection assembly includes a vertical connection plate for connecting with the reaction support, a screw fixed to one side of the vertical connection plate, and several nuts on the screw. The intermediate connection assembly is connected to the lateral connection assembly through the screw and locked and positioned with the lateral connection assembly through the nuts.

9. The dynamic testing device with a viscous damper frame structure according to claim 8, characterized in that: The intermediate connecting assembly includes two perforated posts extending vertically and a non-perforated post connected between the two perforated posts. The holes on the perforated posts allow the screws of the corresponding lateral connecting assemblies to pass through, and the screws are locked and positioned by nuts.

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