Analysis of Shaking Table Test on Underground Structure

Abstract:

During the shaking table test, the acceleration responses of the soil mass and underground structure model, the strain responses of underground structure model were obtained. The simulative effect of boundary was evaluated by analyzing the seismic response acquired from accelerometers. At the same time, the change in natural frequencies and relative damping ratios of soil were also expatiated. And then the rules of the earthquake responses of structure model were concluded on the basis of the test result. The test results show that, compared with the only horizontal acceleration excitation, vertical acceleration excitation’s participation, whose peak was about 2/3 of the peak of the horizontal acceleration excitation, can increase the responses of the structure, and the increment of strain responses are larger than the acceleration responses. Shear deformation is a major deformation pattern for the structure model cross sections.There was a big difference between the spectrum distribution of acceleration response time history and spectrum distribution of strain response time history. Vertical vibration mode made a greater contribution to strain response than horizontal vibration mode.

Key words:underground structure; shaking table model test; dynamic interaction; earthquake response