复杂地形场地上多维多点地震动模拟研究  

Simulation on multi-support and multi-dimensional ground motions in complicated terrain area

作　　者：田利[1] 盖霞[1] 

机构地区：[1]山东大学土建与水利学院,济南250061

出　　处：《振动与冲击》2016年第14期195-201,共7页Journal of Vibration and Shock

基　　金：国家自然科学基金项目(51208285);中国博士后科学基金项目(2012M521338)

摘　　要：研究了复杂地形场地上多维多点地震动的模拟。将基岩加速度反应谱转换成相应的功率谱,介绍了多土层多维地震波的传播理论和基岩相干函数的选取。利用基岩功率谱与相干函数,给出了复杂地形场地上多维多点地震动的模拟方法。针对一算例进行分析,得到了非同类多土层复杂地形场地上的三个点地震动加速度时程曲线、功率谱以及不同分量的放大函数,通过比较功率谱和相干函数的吻合程度,验证了研究成果的准确性。该研究成果可应用于复杂地形场地上大跨度结构的多维多点地震动的分析。The simulation on multi-support and multi-dimensional ground motions in a complicated terrain area was studied. The power spectrum on base rock was obtained by transferring the acceleration response spectra. The wave propagation theory was introduced to deal with the multi-dimensional ground motions with multiple soil layers and the selection of coherence function on base rock was presented. Based on the power spectrum and the coherence function on base rock,a simulation method for multi-support and multi-dimensional ground motions in the complicated terrain area was proposed. According to the analysis of a case study,the time history curves and power spectra at three different points in the complicated terrain area with multiple soil layers were generated. The amplification functions of different components of seismic wave were provided as well. By inspecting the coincidence degree between power spectra and coherence function,the accuracy of the results was verified. The results could be applied to the seismic analysis of large span structures in complicated terrain areas.

关 键 词：多维多点地震动 波的传播理论 基岩功率谱 基岩相干函数 复杂地形场地 

分 类 号：TU435[建筑科学—岩土工程] P315.9[建筑科学—土工工程]