Tall structures, elastic experimental devices, and vibration test benches for simulating high-order modal dynamic responses

Abstract

This invention discloses a tall structure for simulating higher-order modal dynamic response, comprising a skeleton and walls mounted on the skeleton; the skeleton comprises at least two layers of skeleton units; each skeleton unit comprises a central column and at least three crossbeams evenly distributed in a ring on the central column; the two central columns of two adjacent skeleton units can rotate relative to each other in any direction; a spring is provided between corresponding two crossbeams of two adjacent skeleton units, and the two ends of the spring are connected to the corresponding two crossbeams. This invention also discloses an elastic experimental device for simulating higher-order modal dynamic response, comprising a three-dimensional aeroelastic device and the tall structure for simulating higher-order modal dynamic response as described above, the tall structure being mounted on the three-dimensional aeroelastic device. This invention further discloses a vibration test bench for simulating higher-order modal dynamic response, the vibration test bench having the tall structure for simulating higher-order modal dynamic response as described above mounted on it.

Description

Technical Field

[0001] This invention belongs to the field of structural modal analysis technology, specifically a tall structure, elastic experimental device, and vibration test bench for simulating high-order modal dynamic response. Background Technology

[0002] With the development of building structural science and technology, a large number of high-rise / super high-rise buildings and other large, towering structures have been constructed. Due to the long periods, low damping, and vibration sensitivity of these flexible structures, multimodal vibrations are often involved. Therefore, understanding the modal information of these buildings is particularly important. Especially when the structure is subjected to wind loads, seismic loads, and other factors, the contribution of higher-order modes to the dynamic response of the structure cannot be ignored. Selecting the higher-order modes that contribute significantly to the structural response from among the numerous higher-order modes requires experimental setups capable of simulating the higher-order modes of tall structures.

[0003] Traditional experimental setups can typically simulate the first-order mode (fundamental frequency) of unidirectional or multidirectional vibrations. However, in reality, wind loads or seismic waves often excite higher-order modal vibrations above the fundamental frequency. Therefore, existing experimental setups cannot meet the requirements for simulating higher-order modes of structures in unidirectional or multidirectional directions. Summary of the Invention

[0004] In view of this, the purpose of the present invention is to provide a tall structure, an elastic experimental device and a vibration test bench for simulating high-order modal dynamic response, which can realize the simulation of high-order modal dynamic response of multi-degree-of-freedom vibration of tall buildings.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] This invention first proposes a tall structure for simulating high-order modal dynamic response, including a skeleton and walls installed on the skeleton; the skeleton includes at least two layers of skeleton units; each skeleton unit includes a central column and at least three crossbeams evenly distributed in a ring on the central column;

[0007] The two central columns of two adjacent skeleton units can rotate relative to each other in any direction; a spring is provided between the two corresponding crossbeams of two adjacent skeleton units, and the two ends of the spring are connected to the two corresponding crossbeams.

[0008] Furthermore, the two ends of the central column are respectively provided with mutually mating spherical slots and spherical plugs; the lower end of the central column of the skeleton unit located in the upper layer and the upper end of the central column of the skeleton unit located in the lower layer are connected by the spherical slots and spherical plugs.

[0009] Furthermore, the number of crossbeams is even, the springs connected to two crossbeams on the same straight line have equal elastic coefficients and lengths, and the connection point between the spring and the crossbeam is equidistant from the central column; or, the number of crossbeams is odd, the springs connected to all crossbeams have equal elastic coefficients and lengths, and the connection point between the spring and the crossbeam is equidistant from the central column.

[0010] Furthermore, the crossbeam is provided with a spring hook that is connected to the spring.

[0011] Furthermore, at least one spring is provided between the corresponding two crossbeams of two adjacent skeleton units.

[0012] Furthermore, the wall is a planar wall composed of planes around the frame; or, the wall is a curved wall composed of curved surfaces around the frame; or, the wall is a mixed-surface wall composed of planes and curved surfaces around the frame.

[0013] The present invention also proposes an elastic experimental device for simulating higher-order modal dynamic response, comprising a three-dimensional aeroelastic device and a towering structure for simulating higher-order modal dynamic response as described above, wherein the towering structure is mounted on the three-dimensional aeroelastic device.

[0014] Furthermore, the three-dimensional aeroelastic device includes a core column, which can vibrate along mutually perpendicular X and Y axes and torsional vibrate about its axis along the T direction; the central column of the skeleton unit located at the lowest layer is fixedly connected to the core column.

[0015] The present invention also proposes a vibration test bench for simulating higher-order modal dynamic response, wherein a tall structure for simulating higher-order modal dynamic response as described above is installed on the vibration test bench.

[0016] Furthermore, the central column of the skeleton unit located at the lowest layer is fixedly connected to the vibration test bench.

[0017] The beneficial effects of this invention are as follows:

[0018] This invention simulates the high-order modal dynamic response of a tall structure by setting the skeleton as at least two layers of skeleton units, allowing the central columns of adjacent skeleton units to rotate relative to each other in any direction and move relative to each other in the axial direction. At the same time, springs are installed between the corresponding crossbeams of adjacent skeleton units, and the tension applied by the springs to the crossbeams constrains the relative movement between the central columns. In this way, by utilizing the multi-degree-of-freedom vibration between adjacent skeleton units, the simulation of high-order modal dynamic response can be realized, solving the problem that existing experimental devices cannot simulate the high-order modal information of tall structures.

[0019] This invention provides an elastic experimental device for simulating high-order modal dynamic response. By installing a tall structure on a three-dimensional aeroelastic device, it can meet the vibration experimental requirements of simultaneously obtaining the first-order and higher-order modes of the structural response of the tall structure under multiple degrees of freedom such as crosswind, alongwind, and torsion.

[0020] The vibration test bench of this invention, which simulates higher-order modal dynamic response, can simulate the higher-order modal dynamic response of tall structures under seismic waves. Attached Figure Description

[0021] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0022] Figure 1 This is a schematic diagram of a tall structure embodiment of the present invention for simulating high-order modal dynamic response;

[0023] Figure 2 for Figure 1 AA section view;

[0024] Figure 3 for Figure 1 Axonometric drawing;

[0025] Figure 4 This is a front view of the skeleton;

[0026] Figure 5 This is an axonometric drawing of the skeleton.

[0027] Figure 6 This is a schematic diagram of the skeleton unit.

[0028] Figure 7 This is a schematic diagram of the elastic experimental device for simulating high-order modal dynamic response according to the present invention;

[0029] Figure 8 for Figure 7 Axonometric drawing.

[0030] Explanation of reference numerals in the attached figures:

[0031] 1-Wall; 2-Frame; 21-Central column; 22-Beam; 23-Spring; 24-Hook; 25-Spherical slot; 26-Spherical plug; 3-Three-dimensional air spring device; 31-Core column; 32-Connecting plate. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0033] Example 1

[0034] like Figure 1-6 As shown, this embodiment simulates a tall structure with high-order modal dynamic response, including a frame 2 and walls 1 mounted on the frame 2. The frame 2 includes at least two layers of frame units 20. Specifically, in this embodiment, the frame unit 20 includes a central column 21 and at least three horizontal beams 22 evenly distributed in a ring on the central column 21. In this embodiment, the frame unit 20 is set to 7 layers. Of course, in some other embodiments, the number of layers of the frame unit 20 can also be set to 2, 3, 4, 5, 6, or more than 7 layers, etc. The specific number of layers of the frame unit 20 is set according to actual needs and will not be elaborated further.

[0035] The two central pillars 21 of two adjacent skeleton units 20 can rotate relative to each other in any direction. Specifically, for example... Figure 4-5 As shown, in order to constrain the two central columns 21 of two adjacent skeleton units 20, this embodiment provides a spring 23 between two corresponding crossbeams 22 of two adjacent skeleton units 20, with both ends of the spring 23 connected to the two corresponding crossbeams 22. In a preferred embodiment, the crossbeam 22 is provided with a spring hook 24 connected to the spring 23, and both ends of the spring 23 are respectively connected to the two corresponding crossbeams 22 through the spring hook 24. At least one spring 23 is provided between two corresponding crossbeams 22 of two adjacent skeleton units 20. In this embodiment, one spring 23 is provided between two corresponding crossbeams 22. Of course, in other embodiments, two or more springs 23 can also be provided between two corresponding crossbeams 22, which will not be described in detail here.

[0036] Specifically, to maintain the stability of the frame 2, the arrangement of the crossbeams 22 and springs 23 needs to be limited. Specifically, when the number of crossbeams 22 is even, the spring constants and lengths of the springs 23 connected to two crossbeams 22 located on the same straight line are equal, and the distance between the connection point between the spring 23 and the crossbeam 22 and the central column 21 is equal. Thus, utilizing the lever principle, the equal spring constants and lengths of the springs 23 connected to two crossbeams 22 located on the same straight line mean that, without external load, the tension exerted by the springs 23 on the crossbeams 22 is equal. Furthermore, since the distance between the connection point between the springs 23 and the crossbeams 22 and the central column 21 is equal, the torque exerted by the springs 23 on the crossbeams 22 relative to the torque at the connection point between the two central columns 21 of adjacent frame units 20 is equal, thereby achieving force and torque balance in the direction of the two crossbeams 22. Similarly, using the same arrangement of springs 23 on two crossbeams 22 in other straight directions can also achieve force and torque balance. Ultimately, the forces and moments of two adjacent skeleton units 20 can be kept in balance.

[0037] When the number of crossbeams 22 is odd, the spring constants and lengths of the springs 23 connected to all crossbeams 22 are equal, and the distances between the connection points of the springs 23 and the crossbeams 22 and the central column 21 are equal. That is, under the condition of no external load, all springs 23 exert equal tension on the crossbeams 22, and since the crossbeams 22 are evenly distributed in a ring, the forces and moments of adjacent skeleton units 20 can be kept in balance.

[0038] like Figure 4-5 As shown, in this embodiment, four crossbeams 22 are evenly distributed in a ring on the central column 21. The four crossbeams 22 are divided into two groups, with the two crossbeams 22 belonging to the same group located on the same straight line. Thus, in adjacent skeleton units 20, springs 23 are installed between corresponding crossbeams 22, ensuring that the elastic coefficient and length of the springs 23 installed on the two crossbeams 22 belonging to the same group are equal, and the distance between the connection point between the spring 23 and the crossbeam 22 and the central column 21 is equal. In this way, without applying an external load, the force and torque on the two crossbeams 22 can be balanced. In this embodiment, the elastic coefficient and length of the springs 23 installed on the four crossbeams 22 are equal, and the distance between the connection point between the spring 23 and the crossbeam 22 and the central column 21 is equal.

[0039] like Figure 6 As shown, in this embodiment, to ensure the degree of freedom between the central pillars 21 of adjacent skeleton units 20, the two ends of the central pillar 21 are respectively provided with mutually mating spherical slots 25 and spherical plugs 26. Specifically, the lower end of the central pillar 21 of the upper-layer skeleton unit 20 and the upper end of the central pillar 21 of the lower-layer skeleton unit 20 are connected by spherical slots 25 and spherical plugs 26. Through the spherical mating relationship between the spherical slots 25 and spherical plugs 26, the two adjacent central pillars 21 can achieve relative rotation in any direction.

[0040] In this embodiment, wall 1 is a planar wall composed of flat surfaces surrounding the frame 2. Wall 1 in this embodiment is composed of several flat panels joined together. Of course, in some other embodiments, wall 1 can also be a curved wall composed of curved surfaces surrounding the frame 2. In other embodiments, wall 1 can also be a mixed-surface wall composed of both flat and curved surfaces surrounding the frame 2.

[0041] Example 2

[0042] like Figure 7-8As shown, this embodiment proposes an elastic experimental device for simulating higher-order modal dynamic response, including a three-dimensional aeroelastic device 3 and a tall structure for simulating higher-order modal dynamic response as described in Embodiment 1. The tall structure is mounted on the three-dimensional aeroelastic device 3. The three-dimensional aeroelastic device 3 includes a core column 31, which can vibrate along mutually perpendicular X-axis and Y-axis directions and torsional vibrate about its axis along the T-direction. The central column 21 of the bottom-layer skeleton unit 20 is fixedly connected to the core column 31. In this embodiment, the upper end of the core column 31 is provided with a connecting plate 32, and the central column 21 of the bottom-layer skeleton unit 20 is welded and fixed to the connecting plate 32.

[0043] Specifically, the three-dimensional aeroelastic device 3 can be implemented using existing technologies, such as the fully triaxial aeroelastic experimental device with adjustable torsional stiffness disclosed in Chinese patent application CN118225371A, which will not be elaborated further.

[0044] Example 3

[0045] This embodiment proposes a vibration test bench for simulating higher-order modal dynamic response. The vibration test bench is equipped with a tall structure for simulating higher-order modal dynamic response as described in Embodiment 1. Specifically, the central column 21 of the lowest-level skeleton unit 20 is fixedly connected to the vibration test bench.

[0046] The above-described embodiments are merely preferred embodiments provided to fully illustrate the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A tall structure for simulating high-order modal dynamic response, characterized in that: It includes a frame and walls installed on the frame; the frame includes at least two layers of frame units; the frame unit includes a central column and at least three crossbeams evenly distributed in a ring on the central column; The two central columns of two adjacent skeleton units can rotate relative to each other in any direction; a spring is provided between the two corresponding crossbeams of two adjacent skeleton units, and the two ends of the spring are connected to the two corresponding crossbeams. The number of crossbeams is even, and the springs connected to two crossbeams on the same straight line have equal elastic coefficients and lengths, and the connection point between the spring and the crossbeam is equidistant from the central column; or, the number of crossbeams is odd, and the springs connected to all crossbeams have equal elastic coefficients and lengths, and the connection point between the spring and the crossbeam is equidistant from the central column.

2. The towering structure for simulating higher-order modal dynamic response according to claim 1, characterized in that: The central column has a spherical slot and a spherical plug at each end; the lower end of the central column of the skeleton unit located in the upper layer and the upper end of the central column of the skeleton unit located in the lower layer are connected by the spherical slot and the spherical plug.

3. The towering structure for simulating higher-order modal dynamic response according to claim 1, characterized in that: The crossbeam is provided with a spring hook that is connected to the spring.

4. The towering structure for simulating higher-order modal dynamic response according to claim 1, characterized in that: At least one spring is provided between the corresponding two crossbeams of two adjacent skeleton units.

5. The towering structure for simulating higher-order modal dynamic response according to claim 1, characterized in that: The wall is a planar wall composed of planes around the frame; or, the wall is a curved wall composed of curved surfaces around the frame; or, the wall is a mixed-surface wall composed of planes and curved surfaces around the frame.

6. An elastic experimental apparatus for simulating high-order modal dynamic response, characterized in that: It includes a three-dimensional aeroelastic device and a towering structure for simulating higher-order modal dynamic response as described in any one of claims 1-5, the towering structure being mounted on the three-dimensional aeroelastic device.

7. The elastic experimental apparatus for simulating higher-order modal dynamic response according to claim 6, characterized in that: The three-dimensional aeroelastic device includes a core column that can vibrate along mutually perpendicular X and Y axes and torsionally vibrate about its axis along the T direction; the central column of the skeleton unit located at the lowest layer is fixedly connected to the core column.

8. A vibration test bench for simulating high-order modal dynamic response, characterized in that: The vibration test bench is equipped with a tall structure as described in any one of claims 1-5 for simulating higher-order modal dynamic response.

9. The vibration test bench for simulating high-order modal dynamic response according to claim 8, characterized in that: The central column of the skeleton unit located at the bottom layer is fixedly connected to the vibration test bench.

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