半圆柱型沉积盆地对SH波散射的数值分析

发布时间：2018-02-17 04:07

本文关键词： SH波的散射传递矩阵法透射人工边界沉积盆地集中质量显式有限元法　出处：《工程力学》2014年04期 　论文类型：期刊论文

【摘要】：该文实现了一种半无限域SH波散射问题的数值分析方法。采用传递矩阵法得到SH波斜入射时的自由场,将其作为输入;采用集中质量显式有限元方法计算区域内节点的位移;采用透射人工边界计算人工边界点的位移;通过编写的FORTRAN程序实现计算过程。运用该方法对均匀半空间内半圆柱型沉积盆地在SH波入射下的散射进行了分析,与Trifunac M D的解析解进行了对比,验证了该文方法的有效性,分析了不同入射角对地表位移和位移谱放大系数的影响。最后,对成层半空间内半圆柱型沉积盆地在SH波入射下的散射进行了分析。相对于解析方法而言,该方法可以考虑更为复杂地形情况。
[Abstract]:In this paper, a numerical analysis method for scattering of SH waves in semi-infinite domain is implemented. The free field of SH wave at oblique incidence is obtained by transfer matrix method, which is used as input, and the displacement of nodes in the region is calculated by means of lumped mass explicit finite element method. The displacement of artificial boundary point is calculated by transmitting artificial boundary, and the calculation process is realized by FORTRAN program. The scattering of semi-cylindrical sedimentary basin in uniform half-space under the incidence of SH wave is analyzed by using this method. Compared with the analytical solution of Trifunac MD, the validity of the method is verified, and the influence of different incident angles on the surface displacement and the magnification factor of displacement spectrum is analyzed. The scattering of semi-cylindrical sedimentary basins in stratified half-space under the incidence of SH waves is analyzed. Compared with the analytical method, this method can take into account more complicated terrain conditions.
【作者单位】：南京航空航天大学土木工程学系;中国地震局工程力学研究所;
【基金】：国家自然科学基金项目(50978135,51178222) 中央高校基本科研业务费专项资金项目(NZ2012201)
【分类号】：TU311.3

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