竖向地裂缝附近的地面运动  

The ground motion near vertical cracks in fault sites

作　　者：杨笑梅[1] 王海涛[2] 杨柏坡[3] 

机构地区：[1]广东工业大学建设学院,广东广州510643 [2]华南理工大学土木工程系,广东广州510641 [3]中国地震局工程力学研究所黑龙江,哈尔滨150080

出　　处：《地震工程与工程振动》2005年第5期34-40,共7页Earthquake Engineering and Engineering Dynamics

基　　金：国家自然科学基金项目(50178065)

摘　　要：针对均匀弹性半空间不同深度(20m,40m,80m)的细裂缝,由下向上分别垂直和斜(30°)入射一脉冲波,计算裂缝附近地面运动的时程反应和传递函数的幅值谱。计算结果与均匀半空间自由场做了对比,以说明竖向地裂缝对地震波传播和附近地面运动的影响。此外,对断裂周边一般结构抗震设计是否要考虑它的影响,提供了一点参考意见。A homogeneous half space fault site including a small vertical crack is considered with three kinds of different depths （20m, 40m, 80m） respectively. A pulse wave travels along a homogeneous, isotropic and elastic half-space vertically and with an angle of incidence of 30°, respectively. The time history responses of seismic ground motion and the amplitude spectra of transfer function are computed near the vertical cracks. Compared with the seismic responses of free homogeneous half space, the results present the effect of vertical cracks on the propagation of seismic wave and the ground motion near the fault site. In addition the influence of the fault site on the surrounding structures is discussed to prove the regularity in seismic design and some significant suggestions are provided.

关 键 词：裂缝 斜入射 传递函数幅值谱 

分 类 号：P315.915[天文地球—地震学]