关键词: 边坡, 振动台, 模型试验, 传递函数, 动力特性, 频域响应

Abstract:

Transfer function analysis is an important method for obtaining dynamic characteristics parameters and estimating predictive dynamic response of vibration system. Through earthquake simulation shaking table model test of side slopes, transfer function of absolute acceleration and of relative acceleration could be obtained, which reflected the ground motion and the slope body’s seismic vibration respectively. Based on vibration equation analysis of elastomer and its demonstration model test of a side slope, calculation of dynamic characteristics parameters and predictive estimation of seismic response with transfer function analysis were studied. Two pieces of conclusion have been reached: First, in calculation of dynamic characteristics parameters, using the imaginary part of absolute or relative acceleration transfer function could get more reasonable and accurate result than using amplitude and real part. Second, the predictive Fourier spectra of slope’s seismic response could be estimated by multiplication of transfer function and Fourier spectra of input seismic excitation in frequency domain, and the estimation results was in accordance with model test data. It means that transfer function analysis is not only conducive to investigating slope’s essential response feature under complicated and various seismic motions, but also help to designing the shaking table board’s loading waveform of tests.

Key words: side slope, shaking table, model test, transfer function, dynamic characteristics, frequency domain response