局部地形对出平面运动谱特性的影响分析

The Effect Analysis of Topography on the Spectrum Property of Anti-plane Movement

本文利用显式有限元有限差分方法进行了脉冲和实际地震动输入下的粘弹性场地地形影响的分析计算,研究了坡地地形在高宽比不同、体波入射角度不同时出平面运动谱特性的差异。结果显示:地形的特征尺寸和入射角度不仅对地震动的峰值有影响,而且对地震动的谱特性有较大的影响,其中入射角度的影响尤为显著。另外,研究还表明,基于脉冲输入研究粘弹性地形谱特性的影响仍不失为一种有效的方法。

An explicit finite element-finite difference method is performed to evaluate the significance y effects on the seismic response of visco-elastic sites. The real accelerograms and bell-shape impulse wavelets, slope angle of the cliff and angle of incidence on the spectrum property of the incoming waves are all discussed in detail. The conclusions show that the presence of topographic factors and the direction of the incident waves not only significantly affect the peak ground acceleration of site, but also affect the spectrum property of the incoming waves, and the effect of direction of the incident waves is especially remarkable. The study also found that it is reasonable to analyse spectrum properties with input of impulse wavelets in the finite element simulation of wave motion.