局部地形对入射P波谱特性的影响分析

Effect Analysis of Topography on the Spectrum Property of Incident P Waves

利用显式有限元有限差分方法研究了局部突出平台状粘弹性场地的地形影响,比较了高宽比不同、体波入射角度不同时谱特性的差异,分析了相邻地形的存在对地面运动谱特性的影响。研究结果表明,对于局部突出地形,高宽比和体波入射角度对地震动的谱特性有较大影响,入射角度的影响更为显著;相邻地形的存在使地面运动进一步放大。

An explicit finite element-finite difference method is performed to evaluate the part-projecting topography effects on the seismic response of visco-elastic sites. The different spectrum properties under the conditions of different high-width ratios （H/L value） and different angles of incidence are compared, the effect of multi-mesa is analysed also, The results show that for pres- ence of part-projecting topography, the H/L value and the direction of incident waves significantly affect the spectrum property, the effect of the direction of the incident wave is especially remarkable, the presence of multi-mesa also increases the amplification effect of sites.