摘要
基于间接边界元法,首先采用Ricker波作为输入波,分别研究了SH波入射时均匀半空间凸起场地、两侧含覆盖土层的岩质凸起场地、匀质土质凸起场地、异质土质凸起场地的波传播特征,同时比较了凸起地形与土层对Ricker波的放大效应,研究表明,覆盖土层能增强场地对地震动的散射和反射效应并延长地震动持时,土层对地震动的放大效应比凸起地形对地震动的放大效应更为显著。在此基础上进一步以Taft波、El Centro波和天津波作为输入地震动,研究了异质土质凸起场地的地震响应,就本文所考虑的模型而言,这3种地震动输入下得到的凸起场地对地表加速度反应谱峰值的放大幅度分别为102.9%、149.9%和186.7%,大大高于建筑抗震设计规范中为考虑地形效应而对水平地震影响系数最大值进行增幅的取值。
At first,based on indirect boundary element method,and by adopting Ricker wavelet as incident wave,this paper studies the wave propagation characteristics of hill topography in homogeneous half-space,rock hill topography in half-space with one soil layer,soil hill topography in half-space with homogeneous soil layer,and soil hill topography in half-space with heterogeneous soil layer when incident SH wave,respectively,and compares the amplification of seismic ground motion by hill topography and soil. It is revealed that overlaying soil will enhance scattering and reflecting effects and prolong seismic ground motion duration,and soil amplification is much greater than topography amplification. Based on the above,Taft wave,El Centro wave,and Tianjin wave are selected as the incident seismic ground motions,and seismic response of soil hill topography in half-space with heterogeneous soil layer is studied. For the model considered in this paper,when the three seismic ground motions incident the maximum amplification ratio of peak of the surface acceleration response spectrum by the hill site is 102. 9%,149. 9% and 186. 7%,respectively,which are much higher than the values specified by Chinese earthquake resistant code to magnify the maximum value of horizontal earthquake influence coefficient for sake of taking local topography effect into account.
出处
《地震工程与工程振动》
CSCD
北大核心
2016年第2期56-67,共12页
Earthquake Engineering and Engineering Dynamics
基金
中国博士后科学基金项目(2014M561185)~~
关键词
凸起场地
土层放大效应
地形放大效应
地震响应
SH波
斜入射
hill topography
soil amplification
topographic amplification
seismic response
SH wave
inclined incidence
作者简介
张季（1985-），男，讲师，博士后，主要从事土动力学和地震工程研究．E—mail：jizhang@ecjtu.edu．cn
