CN211171802U - High dam anti-seismic test simulation device considering river valley differential effect - Google Patents
High dam anti-seismic test simulation device considering river valley differential effect Download PDFInfo
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- CN211171802U CN211171802U CN201921629893.0U CN201921629893U CN211171802U CN 211171802 U CN211171802 U CN 211171802U CN 201921629893 U CN201921629893 U CN 201921629893U CN 211171802 U CN211171802 U CN 211171802U
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Abstract
The utility model discloses a high dam earthquake-resistant test simulation device considering river valley differential effect, which comprises a low-frequency gate type counter-force wall, a low-frequency vibration table, a high-frequency gate type counter-force wall, a high-frequency vibration table, a soil box, a counter-force low-frequency actuator, a counter-force high-frequency actuator, a low-frequency vibration table actuator and a high-frequency vibration table actuator, and the utility model discloses a test method of combined vibration of the low-frequency vibration table and the high-frequency vibration table can provide high-frequency and low-frequency earthquake wave input for a high dam earthquake dynamic response simulation test; the gate-type reaction wall structure can effectively convert the bending moment effect into the tension effect of the reaction wall pull rod, the high-frequency gate-type reaction wall and the low-frequency gate-type reaction wall can provide high-frequency and low-frequency seismic motion input in the direction perpendicular to the valley, and simultaneously can simulate the difference of seismic wave phases and amplitudes at different positions along the dam foundation interface, so that the valley differential effect is more accurately simulated, and the defects of the conventional seismic simulation vibration table facility are effectively overcome.
Description
Technical Field
The utility model relates to a building, hydraulic engineering antidetonation analogue test technique, in particular to can realize high low frequency loading and the large-scale high dam shaking table analogue test device of seismic oscillation valley differential effect.
Background
In recent years, the hydropower industry of China is rapidly developed, and a large number of high dams with dam heights of more than 300m are built or start to be built successively. At present, in the top 100 dams of the world dam, China occupies 20 seats, and 14 seats are in excess of 200 m. Under the action of earthquake, the earthquake-resistant performance of dam engineering, especially high dam engineering, is related to the life and property safety of thousands of residents at the downstream of the dam. Therefore, under the action of an earthquake, the research on earthquake dynamic response of the dam body and the foundation of the high dam has important significance on the engineering safety of the high dam. The vibration table is the most effective facility for seismic engineering simulation research, the high dam body is placed on the vibration table for dynamic response simulation experiment, the verification and check can be carried out on the seismic design and seismic performance analysis of the dam, and a basis is provided for the high dam engineering design and safe operation.
At present, a high dam shaking table simulation test has several significant problems. First, the loading frequency is in greater conflict with the geometry and load. The earthquake motion may affect the tenth order natural vibration frequency of the dam, if a large vibration table is adopted for simulation, the size can be enlarged, the simulation precision is improved, but the high frequency cannot be loaded; if a small-sized vibration table is adopted for simulation, high-frequency loading can be carried out, but the geometric dimension is small, and the simulation precision is limited. Secondly, the existing research results and earthquake damage investigation results prove that the valley field has important influence on earthquake motion, and when the earthquake occurs, the earthquake motion amplitude and phase at different positions of the dam foundation interface of the high dam project are obviously different, so that serious earthquake damage is caused. The 8.5 grade earthquake of Ningxia Haimai, the 7.7 grade earthquake between Tonghai and Emei of Yunnan province and the earthquake of Liaoning Haicheng all have earthquake abnormal phenomena in valley fields, which leads to serious earthquake damage. However, it is difficult for the existing large-scale vibration table to simultaneously satisfy the above-mentioned simulation requirements.
Therefore, the utility model provides a simulation device can satisfy the high dam high frequency loading under the big scale condition, can satisfy the simulation of river valley differential effect simultaneously.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming not enough among the prior art, providing a can simulate large-scale model test's large-scale shaking table testing arrangement, the device can provide high frequency and low frequency ground simultaneously and move the input, also can realize the simulation of valley differential effect.
The utility model adopts the technical proposal that: a high dam seismic test simulation device considering a valley differential effect comprises:
the low-frequency door type counter-force wall is arranged on a vibrating table foundation, and a vibrating table mounting space is arranged in the vibrating table foundation in the low-frequency door type counter-force wall;
the low-frequency vibration table is arranged in the vibration table mounting space;
the high-frequency gate type counter force wall is arranged on the low-frequency vibration table;
the high-frequency vibration table is arranged on the low-frequency vibration table and is positioned in the high-frequency door type reaction wall;
the soil box is arranged on the high-frequency vibration table, a simulation dam body and a simulation foundation of the high dam to be tested are arranged in the soil box after being reduced in proportion, and a damping boundary for simulating infinite foundation radiation damping effect is arranged between the simulation foundation and the soil box;
the counter-force low-frequency actuator is fixed on the low-frequency door type counter-force wall and directly acts on the soil box;
the counter-force high-frequency actuator is fixed on the high-frequency door type counter-force wall and directly acts on the soil box;
the low-frequency vibration table actuator is fixed on the side wall and the bottom surface of the vibration table mounting space and directly acts on the low-frequency vibration table; and the number of the first and second groups,
the high-frequency vibration table actuator is fixed on the low-frequency vibration table and directly acts on the high-frequency vibration table, and meanwhile, the high-frequency vibration table is connected with the low-frequency vibration table through the high-frequency vibration table actuator.
Furthermore, the low-frequency door type reaction wall and the high-frequency door type reaction wall are of a door-shaped structure and comprise two vertical wall bodies and reaction wall pull rods, the reaction wall pull rods are connected with the two vertical wall bodies, and the bending moment applied to the vertical wall bodies is converted into the pulling force applied to the reaction wall pull rods.
Further, the reaction force low-frequency actuator and the reaction force high-frequency actuator are both arranged in the horizontal direction.
Furthermore, the counter-force low-frequency actuator and the counter-force high-frequency actuator are arranged in a plurality along the vertical direction.
Further, the low-frequency vibration table actuators arranged on the side wall of the vibration table mounting space are arranged along the horizontal direction and are arranged along the periphery of the low-frequency vibration table; the low-frequency vibration table actuators arranged on the bottom surface of the vibration table mounting space are arranged along the vertical direction; the low-frequency vibration table actuators are arranged along the vertical direction.
The utility model has the advantages that: the utility model relates to a high dam earthquake-proof test simulator considering the river valley differential effect, which adopts a test method of the combined vibration of a low-frequency vibration table and a high-frequency vibration table, and can provide high-frequency and low-frequency earthquake wave input for a high dam earthquake dynamic response simulation test; the gate-type reaction wall structure can effectively convert the bending moment effect into the tension effect of the reaction wall pull rod, the high-frequency gate-type reaction wall and the low-frequency gate-type reaction wall can provide high-frequency and low-frequency seismic motion input in the direction perpendicular to the valley, and simultaneously can simulate the difference of seismic wave phases and amplitudes at different positions along the dam foundation interface, so that the valley differential effect is more accurately simulated, and the defects of the conventional seismic simulation vibration table facility are effectively overcome. Adopt the utility model discloses analogue means carries out analogue test, can reflect the actual earthquake response of dam body more accurately.
Drawings
FIG. 1: the utility model discloses consider the structural schematic diagram of high dam anti-seismic test analogue means of river valley differential effect;
the attached drawings are marked as follows: 1. a low frequency vibration table; 2. a high-frequency vibration table; 3. a counter-force high-frequency actuator; 4. a counter-force low-frequency actuator; 5. a low-frequency gate type counterforce wall; 6. a high-frequency gate type counterforce wall; 7. a counterforce wall pull rod; 8. a soil box; 9. a damping boundary; 10. simulating a foundation; 11. simulating a dam body; 12. a high-frequency vibration table actuator; 13. a low frequency vibration table actuator.
Detailed Description
For further understanding of the contents, features and functions of the present invention, the following embodiments will be exemplified in conjunction with the accompanying drawings as follows:
as shown in fig. 1, the high dam anti-seismic test simulation device considering the river valley differential effect comprises a low-frequency vibration table 1, a high-frequency vibration table 2, a counter-force high-frequency actuator 3, a counter-force low-frequency actuator 4, a low-frequency gate type counter-force wall 5, a high-frequency gate type counter-force wall 6, a high-frequency vibration table actuator 12, a low-frequency vibration table actuator 13 and the like.
A vibration table installation space is arranged in a vibration table foundation, the low-frequency vibration table 1 is arranged in the vibration table installation space, the low-frequency vibration table actuators 13 are fixed on the side wall and the bottom surface of the vibration table installation space and directly act on the low-frequency vibration table 1, the low-frequency vibration table actuators 13 arranged on the side wall of the vibration table installation space are arranged along the horizontal direction and are arranged along the periphery of the low-frequency vibration table 1, and the low-frequency vibration table actuators 13 arranged on the bottom surface of the vibration table installation space are arranged along the vertical direction; high-frequency vibration platform 2 sets up on the low-frequency vibration platform 1, high-frequency vibration platform actuator 12 is fixed on the low-frequency vibration platform 1 to direct action in high-frequency vibration platform 2, low-frequency vibration platform actuator 13 arranges along vertical direction, through high-frequency vibration platform actuator 12 connects low-frequency vibration platform 1 with high-frequency vibration platform 2 can with low-frequency vibration excitation transmission extremely high-frequency vibration platform 2 and then transmit for test structure on the high-frequency vibration platform 2. The test structure comprises a simulation dam body 11 and a simulation foundation 10 of a dam to be measured, which are integrally reduced by actual engineering according to a certain scale, wherein the simulation dam body 11 and the foundation 10 are arranged in a soil box 8, and damping boundaries 9 are arranged on two sides of the soil box 8 and between the simulation foundation 10 and the inner wall of the soil box 8 and are used for simulating the damping effect of infinite foundation radiation; the soil box 8 is arranged on the high-frequency vibration table 2.
The low-frequency door type reaction wall 5 is arranged on the vibrating table base and located outside the range of the low-frequency vibrating table 1, provides reaction force for the reaction force low-frequency actuator 4 arranged on the low-frequency door type reaction wall, and the reaction force low-frequency actuator 4 directly acts on the soil box 8 to provide low-frequency seismic wave input for tests. The high-frequency door type reaction wall 6 is arranged on the low-frequency vibration table 1 and is positioned outside the range of the high-frequency vibration table 2, the high-frequency door type reaction wall 6 vibrates along with the low-frequency vibration table 1 and provides reaction force for the reaction force high-frequency actuator 3 arranged on the high-frequency door type reaction wall, and the reaction force high-frequency actuator 3 also directly acts on the soil box 8 to provide high-frequency seismic wave input for a test.
In order to reduce the reaction wall section and receive moment of flexure effect and pull apart, low frequency gate-type reaction wall 5 with high frequency gate-type reaction wall 6 all is "door" font structure, including two vertical wall bodies in face and reaction wall pull rod 7, two faces are connected to reaction wall pull rod 7 the top of vertical wall body will the moment of flexure effect that vertical wall body received turns into the pulling force that reaction wall pull rod 7 received.
The counter-force low-frequency actuator 4 with the counter-force high-frequency actuator 3 has all been arranged a plurality ofly along vertical direction, and, the counter-force low-frequency actuator 4 with the counter-force high-frequency actuator 3 all arranges along the horizontal direction.
Example 1
The size of a table top of the low-frequency vibration table 1 is 20m × 15m and can provide low-frequency vibration input below 0-25 Hz, the size of a table top of the high-frequency vibration table 2 is 10m × 6m and can provide high-frequency vibration input below 25 Hz-50 Hz, a prototype dam of a dam body is 300m, a test is carried out according to a 1:80 scale, the height of a simulated dam body 11 is 3.75m, the depth, the upstream range and the downstream range of a soil body of the simulated foundation 10 are respectively 1 time of the height of the simulated dam body 11, the soil body range of left and right bank simulated foundations 10 is half times of the height of the simulated dam body 11, the total weight is 800t, the 10 th section of the dam body has the natural vibration frequency of about 5Hz and is calculated according to a gravity similarity criterion, if dynamic response of the order frequency is simulated, the vibration table needs to provide vibration frequency input of 44.7Hz, the high-frequency vibration table 2 in the embodiment can meet the requirements, the size and the number of wall pull rods 7 are set according to the test calculation requirements, when the test is carried out, the low-frequency vibration table 1 transmits the input of 25Hz to the seismic counter force input of the seismic table 2, the high-frequency vibration counter force input is different from the high-frequency vibration table 2, the low-frequency vibration actuator, the low-frequency differential vibration actuator is provided from the.
Although the preferred embodiments of the present invention have been described with reference to the accompanying drawings, the present invention is not limited to the above-mentioned embodiments, which are only illustrative and not restrictive, and those skilled in the art can make many forms without departing from the spirit and scope of the present invention, which is within the protection scope of the present invention.
Claims (5)
1. A high dam seismic test simulation device considering a valley differential effect, comprising:
the low-frequency gate type reaction wall (5) is arranged on a vibrating table foundation, and a vibrating table mounting space is arranged in the vibrating table foundation in the low-frequency gate type reaction wall (5);
the low-frequency vibration table (1), the low-frequency vibration table (1) is arranged in the vibration table mounting space;
the high-frequency door type reaction wall (6), the high-frequency door type reaction wall (6) is arranged on the low-frequency vibration table (1);
the high-frequency vibration table (2) is arranged on the low-frequency vibration table (1) and is positioned in the high-frequency door type reaction wall (6);
the soil box (8) is arranged on the high-frequency vibration table (2), a simulation dam body (11) and a simulation foundation (10) of the high dam to be tested are arranged in the soil box (8) after being reduced in proportion, and a damping boundary (9) for simulating infinite foundation radiation damping effect is arranged between the simulation foundation (10) and the soil box (8);
the counter-force low-frequency actuator (4) is fixed on the low-frequency door type counter-force wall (5) and directly acts on the soil box (8);
the reaction high-frequency actuator (3) is fixed on the high-frequency door type reaction wall (6) and directly acts on the soil box (8);
the low-frequency vibration table actuator (13) is fixed on the side wall and the bottom surface of the vibration table mounting space, and directly acts on the low-frequency vibration table (1); and the number of the first and second groups,
high-frequency vibration table actuator (12), high-frequency vibration table actuator (12) are fixed on low-frequency vibration table (1), and direct action in high-frequency vibration table (2), simultaneously, high-frequency vibration table (2) with pass through between low-frequency vibration table (1) high-frequency vibration table actuator (12) are connected.
2. The high dam earthquake-proof test simulation device considering the valley differential effect as claimed in claim 1, wherein the low frequency door type reaction wall (5) and the high frequency door type reaction wall (6) are both in a door-shaped structure and comprise two vertical wall bodies and reaction wall pull rods (7), and the reaction wall pull rods (7) are connected with the tops of the two vertical wall bodies to convert the action of bending moment on the vertical wall bodies into the pulling force on the reaction wall pull rods (7).
3. A high dam earthquake resistance test simulation device considering valley differential effect according to claim 1, wherein the reaction force low frequency actuator (4) and the reaction force high frequency actuator (3) are arranged in a horizontal direction.
4. A high dam earthquake resistance test simulation device considering valley differential effect according to claim 1, wherein a plurality of the reaction force low frequency actuators (4) and the reaction force high frequency actuators (3) are arranged in the vertical direction.
5. The high dam earthquake-proof test simulation device considering the river valley differential effect according to claim 1, wherein the low frequency vibration table actuators (13) provided at the side walls of the vibration table installation space are arranged in the horizontal direction and along the periphery of the low frequency vibration table (1); the low-frequency vibration table actuators (13) arranged on the bottom surface of the vibration table mounting space are arranged along the vertical direction; the low-frequency vibration table actuator (13) is arranged along the vertical direction.
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| CN110685252A (en) * | 2019-09-27 | 2020-01-14 | 天津大学 | High dam anti-seismic test simulation device considering river valley differential effect |
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| CN110685252A (en) * | 2019-09-27 | 2020-01-14 | 天津大学 | High dam anti-seismic test simulation device considering river valley differential effect |
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