CN108731894B - Eliminate structure of waterproof disturbance wave of vibrating table under water - Google Patents
Eliminate structure of waterproof disturbance wave of vibrating table under water Download PDFInfo
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- CN108731894B CN108731894B CN201810632864.3A CN201810632864A CN108731894B CN 108731894 B CN108731894 B CN 108731894B CN 201810632864 A CN201810632864 A CN 201810632864A CN 108731894 B CN108731894 B CN 108731894B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 26
- 238000010008 shearing Methods 0.000 claims abstract description 21
- 239000002689 soil Substances 0.000 claims abstract description 17
- 230000000694 effects Effects 0.000 claims abstract description 6
- 239000000463 material Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 9
- 230000005855 radiation Effects 0.000 claims description 4
- 229910000838 Al alloy Inorganic materials 0.000 claims description 3
- 238000004088 simulation Methods 0.000 abstract description 12
- 230000003993 interaction Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001808 coupling effect Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
Abstract
A structure for eliminating waterproof disturbance waves of an underwater vibrating table relates to the field of underwater vibration tests of civil engineering, water conservancy and the like, adopts a mode of shearing Liang Tu boxes in a wave-absorbing false bottom and pre-stretching elastic waterproof fit mode, and ensures the authenticity of simulation while eliminating the waterproof disturbance waves of the vibrating table. Firstly, a wave-canceling false bottom which can move along with the soil box is adopted, so that disturbance waves are always blocked below the false bottom, and the influence of the disturbance waves caused by the vibration table on the water body around the vibration table is effectively solved. Secondly, the wave-absorbing false bottom is suspended in water, and the outer section is provided with pre-tensioned elastic waterproof, so that the false bottom is always tensioned, the field follow-up effect around the shear Liang Tuxiang can be effectively simulated, and the surrounding water body environment of the vibrating table is more nearly real. And thirdly, the rigidity of shear Liang Tuxiang is considered by adopting pre-stretching elastic waterproof, so that the simulation of the soil body boundary condition in the soil box is more real, and the simulation of the soil-structure interaction under the earthquake is effectively ensured. The invention has simple structure, easy realization and low cost.
Description
Technical Field
The invention relates to the technical field of underwater vibrating table tests of civil engineering, water conservancy and the like, in particular to a structure for eliminating disturbance waves caused by a waterproof structure of an underwater vibrating table.
Background
The vibrating table is the most effective facility for carrying out earthquake engineering simulation research, can verify and check earthquake-resistant design and earthquake-resistant performance analysis of an engineering structure, and can effectively develop research work of scientific problems related to earthquake engineering. Due to the limitations of technical level and engineering application, most of the existing domestic and foreign vibrating tables are anhydrous vibrating tables (or vibrating table arrays). However, along with the occurrence of the shock phenomenon of wading engineering and the continuous and deep research of fluid-solid coupling problems, students find that the water has a great influence on the shock resistance of the structure, and the construction of an underwater vibrating table (or an array of vibrating tables) is necessary.
At present, the vibrating table can only ensure local vibration, and has more limitations on the real simulation of the whole-field vibration of the structure in the hydrodynamic environment. First, in the case of a large-sized vibrating table, a large-sized vibration exciter is generally used to drive the table surface, so that a large gap is formed between the table body peripheral support and the table body structure. In order to ensure safe operation of the vibrating table, researchers at home and abroad propose various vibrating table waterproof measures, and the mode of air bag waterproof is most common at present. However, because the waterproof structure of the air bag is large in size and surrounds the periphery of the table body of the vibrating table, waterproof deformation in the moving process of the vibrating table can greatly disturb the water body around the vibrating table to form disturbance waves. For a still water environment, the interference tends to distort the hydrodynamic pressure around the structure; for hydrodynamic environments (such as wave generation and flow generation), the wave and water flow fields simulated by the hydrodynamic device have large differences from the target flow field. Secondly, because the limit of shaking table load, current shaking table under water mostly only considers the structure, does not consider the soil body, so experimental test piece does not contain soil box structure, does not consider soil box and soil body dead weight, can't simulate the interact of soil and structure. And thirdly, the actual earthquake is not limited to vibration at a certain point, but is whole-field vibration, the water body state at the periphery of the structure is influenced by the terrain and the whole-field vibration, and if only the vibration in the range of the vibrating table is considered and the vibration of the peripheral field and the disturbance of the water body are ignored, the simulation result is inevitably distorted. Therefore, the problems above tend to cause distortion of the simulation effect of the earthquake-hydrodynamic coupling, thereby affecting the test process and reducing the test accuracy or failing the test.
Therefore, it is necessary to provide a structure for eliminating the waterproof disturbance wave of the underwater vibrating table, and the coupling action relation of earthquake-hydrodynamic force is simulated as truly as possible on the premise of eliminating the disturbance wave.
Disclosure of Invention
The utility model aims at providing a be applicable to engineering fields such as civil engineering, water conservancy, eliminate the structure of shaking table waterproof disturbance wave, this structure can effectively eliminate the disturbance wave interference around the test piece, and real simulation earthquake in-process whole field vibrates water environment and soil-structure interaction down.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the structure for eliminating the waterproof disturbance wave of the underwater vibrating table comprises a wave-absorbing false bottom, a fixed false bottom, a false bottom support, a connecting hinge and a pre-tensioned elastic waterproof shearing Liang Tu box, wherein the wave-absorbing false bottom consists of a plurality of fan-shaped structures, one end of the wave-absorbing false bottom is fixed at the top end of the outer wall of the shearing Liang Tuxiang through the connecting hinge and is annularly arranged along the periphery of a shearing beam soil box; the other end of the wave-absorbing false bottom is connected with one end of the pre-tensioned elastic waterproof, the other end of the pre-tensioned elastic waterproof is connected with a false bottom support through a connecting hinge, the false bottom support is annularly fixed on a concrete foundation, the fixed false bottom is arranged on the periphery of the wave-absorbing false bottom, the false bottom support is radially distributed around the false bottom support and fixed on the false bottom support, a table body cavity is arranged in the middle of the concrete foundation at a position opposite to the shear Liang Tuxiang, a vibration table body is arranged in the table body cavity, and the shear Liang Tuxiang is fixed on the vibration table body; an air bag is arranged between the vibrating table body and the upper edge of the table body cavity of the concrete foundation to prevent water, and a plurality of vertical actuators and horizontal actuators connected with the table body cavity are respectively arranged at the bottom and the side wall of the vibrating table body.
Further, the wave-absorbing false bottoms are radially distributed on the periphery of the shear Liang Tuxiang, the radiation length is not less than 1.5 times of the table surface size of the vibrating table body, the number is between 30 and 60, and each wave-absorbing false bottom is connected by adopting a flexible rubber material and the waterproof effect is ensured; the wave-absorbing false bottom adopts a hollow aluminum alloy frame structure, and the density is slightly lighter than that of a water body.
Further, the number of pre-tensioned elastic waterproof and false bottom supports is consistent with that of single-chip wave-absorbing false bottoms; the pre-tensioned elastic waterproof consists of a tension spring and a flexible geotechnical material, and the overall rigidity of the pre-tensioned elastic waterproof is matched with the rigidity of the shear Liang Tuxiang.
Further, the fixed false bottom material is masonry or movable support geotechnical material, and does not move along with the structure in the test process.
The beneficial effects of the invention are as follows:
the structure for eliminating the waterproof disturbance wave of the underwater vibrating table adopts a mode of eliminating a wave false bottom and pre-stretching an elastic waterproof matching shearing Liang Tu box, so that the simulation authenticity is ensured while the waterproof disturbance wave of the vibrating table is eliminated, and the structure has outstanding beneficial effects. Firstly, the wave-absorbing false bottom which can move along with the soil box is adopted in the structure, so that disturbance waves are always blocked below the false bottom, and the influence of the disturbance waves caused by the vibration table on the water body around the vibration table is effectively solved. And secondly, the wave-absorbing false bottom is equivalent to the water body in weight, can be suspended in water, and the outer section is provided with pre-tensioned elastic waterproof, so that the false bottom is always tensioned. This allows the field follow-up effect around shear Liang Tuxiang to be effectively simulated, making the water environment around the vibrating table more nearly real. And the rigidity of the shearing soil box is considered by adopting pre-stretching elastic waterproof, so that the simulation of the soil body boundary condition in the soil box is more real, and the simulation of the soil-structure interaction under the earthquake is effectively ensured. In addition, the structure is simple, the implementation is easy, and the manufacturing cost is low.
Drawings
FIG. 1 is a longitudinal sectional view of a structure for eliminating water-proof disturbance waves of an underwater vibration table;
FIG. 2 is a cross-sectional view of a structure for eliminating water-proof disturbance waves of an underwater vibration table;
figure 3 is a longitudinal section view of the underwater vibration table after the structural movement for eliminating the waterproof disturbance wave.
1, a wave-absorbing false bottom; 2. fixing the false bottom; 3. a false bottom support; 4. a connecting hinge; 5. pre-stretching elastic waterproof; 6. shearing Liang Tuxiang; 7. a vibrating table body; 8. a concrete foundation; 9. the air bag is waterproof; 10. a stage chamber; 11. a vertical actuator; 12. a horizontal actuator.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
Referring to fig. 1, 2 and 3, the structure for eliminating the waterproof disturbance wave of the underwater vibrating table comprises a wave-absorbing false bottom 1, a fixed false bottom 2, a false bottom support 3, a connecting hinge 4, a pre-tensioned elastic waterproof 5 and a shearing Liang Tuxiang, wherein one end of the wave-absorbing false bottom 1 is fixed at the top end of the outer wall of the shearing Liang Tuxiang 6 through the connecting hinge 4 and is distributed annularly along the periphery of a shearing beam soil box 6, so that the wave-absorbing false bottom 1 can move together with the shearing Liang Tuxiang 6. The wave-absorbing false bottom 1 is in a fan shape, is radially distributed on the periphery of the shearing Liang Tu box 6, has the radiation length not smaller than 1.5 times of the size of the table surface of the vibrating table body 7, has the number of 30-60, adopts a hollow aluminum alloy frame structure, has the density equivalent to that of a water body, is slightly lighter than the water body, and is connected by adopting a flexible rubber material between each two wave-absorbing false bottoms 1 and ensures the waterproof effect. The other end of the wave-absorbing false bottom 1 is connected with one end of a pre-stretching elastic waterproof 5, the other end of the pre-stretching elastic waterproof 5 is connected with a false bottom support 3 through a connecting hinge 4, the number of the pre-stretching elastic waterproof 5 and the false bottom support 3 is identical to that of the single-piece wave-absorbing false bottom 1, and the false bottom support 3 is annularly fixed on a concrete foundation 8 at the bottom of a shear Liang Tuxiang. The pre-tensioned elastic waterproof 5 consists of a tension spring and a flexible geotechnical material, wherein the spring has pre-tensioned elasticity and can be tensioned and contracted at any time, and the flexible geotechnical material can play a role in waterproof; the overall rigidity of the pre-tensioned elastic waterproof 5 needs to be matched with the rigidity of the shearing Liang Tuxiang, so that the similarity of soil boundary conditions in the test process is ensured; the fixed false bottom 2 is arranged on the periphery of the wave-absorbing false bottom 1, is radially distributed around the false bottom support 3, is fixed on the false bottom support 3, is made of masonry or movable support geotechnical materials and the like, and does not move along with the structure in the test process; a concrete foundation 8 is arranged at the bottom of the shear Liang Tuxiang, a table body chamber 10 is arranged in the middle of the concrete foundation 8 and opposite to the shear Liang Tu box 6, a vibration table body 7 is arranged in the table body chamber 10, and the shear Liang Tu box 6 is fixed on the vibration table body 7; an air bag waterproof 9 is arranged between the vibration table body 7 and the upper edge of a table body chamber 10 of the concrete foundation 8, so that safe and effective operation of equipment in the table body chamber 10 is ensured; the bottom and the side wall of the vibration table body 7 are respectively provided with a plurality of vertical actuators 11 and horizontal actuators 12 connected with the table body chamber 10, and the vertical actuators 11 and the horizontal actuators 12 in the table body chamber 10 can ensure the accurate simulation of the vibration table body 7 on the earthquake.
In the embodiment, the table surface size of the vibrating table body 7 is 6 multiplied by 6m, the load is 150t, the working water depth is 3m, and the maximum horizontal and vertical travel is 0.5m; the number of the horizontal actuators is 32, and the number of the vertical actuators is 8; the soil box is 5.5 multiplied by 5.5m in size and 1m in height; the radiation length of the wave-absorbing false bottom is 10m.
In the running process, the vertical actuator 11 and the horizontal actuator 12 can force the vibration table body 7 to displace or rotate; at this time, the air bag waterproof 9 can correspondingly deform to generate disturbance waves; the shearing Liang Tuxiang and the wave-absorbing false bottom 1 can move along with the vibrating table body 7, and the corresponding pre-tensioned elastic waterproof 5 can be stretched or contracted; in the running process of the vibrating table, disturbance waves are always blocked and dissipated below the wave-absorbing false bottom 1, and the whole field vibration environment considering the soil-structure interaction can be effectively simulated by the follow-up of the shear Liang Tuxiang and the wave-absorbing false bottom 1.
Claims (2)
1. A structure for eliminating waterproof disturbance waves of an underwater vibrating table is characterized in that: the wave-absorbing artificial bottom comprises a wave-absorbing artificial bottom (1), a fixed artificial bottom (2), an artificial bottom support (3), a connecting hinge (4), pre-stretching elastic waterproof (5) and shearing Liang Tuxiang (6), wherein the wave-absorbing artificial bottom (1) consists of a plurality of fan-shaped structures, one end of the wave-absorbing artificial bottom is fixed at the top end of the outer wall of the shearing Liang Tuxiang (6) through the connecting hinge (4) and is annularly distributed along the periphery of a shearing beam soil box (6); the other end of the wave-absorbing false bottom (1) is connected with one end of the pre-tensioned elastic waterproof (5), the other end of the pre-tensioned elastic waterproof (5) is connected with the false bottom support (3) through a connecting hinge (4), the false bottom support (3) is annularly fixed on the concrete foundation (8), the fixed false bottom (2) is arranged on the periphery of the wave-absorbing false bottom (1), radially distributed around the false bottom support (3) and fixed on the false bottom support (3), a table body cavity (10) is arranged in the middle part of the concrete foundation (8) and opposite to the shearing Liang Tuxiang (6), a vibrating table body (7) is arranged in the table body cavity (10), and the shearing Liang Tuxiang (6) is fixed on the vibrating table body (7); an air bag waterproof device (9) is arranged between the vibrating table body (7) and the upper edge of a table body chamber (10) of the concrete foundation (8), and a plurality of vertical actuators (11) and horizontal actuators (12) connected with the table body chamber (10) are respectively arranged at the bottom and the side wall of the vibrating table body (7);
the wave-absorbing false bottoms (1) are radially distributed on the periphery of the shearing Liang Tuxiang (6), the radiation length is not less than 1.5 times of the table surface size of the vibrating table body (7), the number is between 30 and 60, and each wave-absorbing false bottom (1) is connected by adopting a flexible rubber material and the waterproof effect is ensured;
the wave-absorbing false bottom (1) adopts a hollow aluminum alloy frame structure, and the density is slightly lighter than that of a water body;
the number of the pre-tensioned elastic waterproof supports (5) and the false bottom supports (3) is consistent with that of the single-chip wave-absorbing false bottoms (1); the pre-tensioned elastic waterproof (5) consists of a tension spring and a flexible geotechnical material, and the overall rigidity of the pre-tensioned elastic waterproof (5) is matched with the rigidity of the shearing Liang Tuxiang (6).
2. The structure for eliminating the waterproof disturbance wave of the underwater vibration table according to claim 1, wherein: the fixed false bottom (2) is made of masonry or movable supporting geotechnical material, and does not move in the test process.
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| CN201810632864.3A CN108731894B (en) | 2018-06-20 | 2018-06-20 | Eliminate structure of waterproof disturbance wave of vibrating table under water |
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| CN201810632864.3A CN108731894B (en) | 2018-06-20 | 2018-06-20 | Eliminate structure of waterproof disturbance wave of vibrating table under water |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109839255A (en) * | 2018-12-20 | 2019-06-04 | 天津大学 | A kind of inflatable water-tight device for underwater shake table |
| CN110595713A (en) * | 2019-09-27 | 2019-12-20 | 天津大学 | Suspension type tunnel earthquake and flow induced vibration composite test simulation device |
| CN115662257B (en) * | 2022-12-26 | 2023-04-07 | 中国科学院、水利部成都山地灾害与环境研究所 | Post-earthquake riverway evolution simulation test device |
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