SH波入射时等腰三角形与半圆形凸起地形的地震动  

Ground motion of isosceles triangular and semi-circular hills with the SH incident wave

作　　者：杜永军[1,2] 刘殿魁 赵启承[1] 邱发强 王春华[1] 

机构地区：[1]大庆石油学院机械科学与工程学院,黑龙江大庆163318 [2]北京科技大学机械工程学院,北京100083 [3]哈尔滨工程大学建筑工程学院,黑龙江哈尔滨150001

出　　处：《世界地震工程》2009年第3期167-174,共8页World Earthquake Engineering

基　　金：黑龙江省自然科学基金项目(A200508)

摘　　要：利用复变函数和移动坐标研究了等腰三角形凸起和半圆形凸起地形对SH波的散射。首先将求解区域分为三个部分,区域Ⅰ为一个带有半圆形弧线的等腰三角形区域,区域Ⅱ为含有两个半圆形凹陷的弹性半空间,区域Ⅲ为包括半圆形凸起在内的圆形区域。在区域Ⅰ中构造满足在腰三角形斜边上应力自由的驻波函数WA,在区域Ⅱ中分别构造两个半圆形凹陷的散射波WB和WC,且两者均预先满足水平界面上应力为零的边界条件,在区域Ⅲ构造一个上半部边界应力为零,而其余部分位移、应力任意的驻波函数。将所研究的问题转换成一个求解满足在"公共边界"上位移应力连续的问题。可利用坐标移动方法,通过傅立叶级数展开,建立该问题代数方程组,并采用截断有限项的方法对其进行求解。最后,给出了一个算例。In this paper, the scattering of the isosceles triangular hill and the hemi-circular hill to SH wave is stud- ied based on complex function and moving coordinate. The solution is divided into three domains, where domain I involves a isosceles triangle with semi-circular arc, domain II is an elastic half-space with semi-circular depression and domain III is a circle area with semi-circular hill. A standing wave function WA is constructed in the domain I , which satisfies the zero-stress condition at the triangular wedges of the isosceles triangle. In the domain II, two scat- tering wave functions W^B and Wc with semi-circular depression which satisfy the condition of stress-free at the hori- zontal surface are constructed. In the domain Ⅲ, a standing wave function which satisfies the condition that the stress of the top half of the domain is zero and the displacement and the stress of the others is arbitrary. This is to solve the problem that satisfies the conditions of displacement continuity and stress equilibrium at the interface of the two boundaries. By using moving coordinate method, the result is acquired by constructing a set of linear alge- braic equations through Fourier series expansion. Finally a numerical example is given.

关 键 词：SH波散射 等腰三角形凸起 半圆形凸起 地震动 

分 类 号：P315.96[天文地球—地震学]