Device used for simulating foundation radiation damping effect in vibration table test

Abstract

The invention discloses a device used for simulating a foundation radiation damping effect in a vibration table test, and relates to the device used for simulating the radiation damping effect in a vibration table model test for a large-scale underground structure and a hydraulic structure. Flaky rubber sacs are arranged between the side wall inside a model box and model soil in the model box of a vibration table; the number of the rubber sacs is an even number greater than 2; the rubber sacs are respectively attached to the side surface inside the model box uniformly; the rubber sacs opposite to each other in pairs are respectively communicated with each other through flexible conduit tubes respectively; and the interior of each rubber sac is filled with sponge and water. When the model box filled with the model soil is under the action of seismic excitation in the horizontal direction, a model soil body moves reciprocally in the horizontal direction; in the moving process of the model soil, the water in the rubber sac flows in the sponge and the flexible conduit tubes; when the water flows through the sponge, volume resistance to the movement of the water is generated by the sponge to consume energy; moreover, the water in the flexible conduit tubes moves reciprocally at the speed which is several times that of the model soil so as to adsorb and consume radiation energy. Thedevice simulates the foundation radiation damping effect very well.

Description

technical field

[0001] The invention relates to a device for simulating the radiation damping effect of foundations, which is used for simulating the radiation damping effect in the shaking table model test of large-scale underground structures and hydraulic structures. Background technique

[0002] In the dynamic interaction between the structure and the foundation, seismic waves transmit vibration energy to the structure through the foundation medium, and at the same time, the vibration energy of the structure is also transmitted outward through the foundation medium. The latter phenomenon is called energy radiation in dynamic analysis. Since the energy radiation reduces the vibration of the structure, which is similar to the damping effect of the structure, the energy radiation is also called the radiation damping effect. When evaluating the seismic response of large structures, the radiation damping effect of the foundation must be taken into account in an appropriate wa...

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