Time domain method for calculating free field motion of a layered half-space subjected to obliquely incident body waves

作     者：李山有 朱海燕 高淑芳 

作者机构：Institute of Engineering Mechanics China Earthquake Administration Earthquake Administration of Fujian Province No.703 Team of Bureau of Geological Exploration of Nonferrous Metals of Heilongjiang Province 

出 版 物：《Earthquake Engineering and Engineering Vibration》 (地震工程与工程振动（英文刊）)

年 卷 期：2007年第6卷第2期

页      面：191-196页

核心收录：

学科分类：070801[理学-固体地球物理学] 07[理学] 0708[理学-地球物理学] 

基　　金：National Natural Science Foundation of China Under Grant No. 50178065 

主　　题：layered half-space wave scattering obliquely incidence artificial botmdary explicit finite element method Snell law 

摘      要：In numerical simulation of wave scattering under oblique incident body waves using the finite element method, the free field motion at the incident lateral boundary induced by the background layered half-space complicates the computational area. In order to replace the complex frequency domain method, a time-domain method to calculate the free field motion of a layered half-space subjected to oblique incident body waves is developed in this paper. The new method decouples the equations of motion used in the finite element method and offers an interpolation formula of the free field motion. This formula is based on the fact that the apparent horizontal velocity of the free field motion is constant and can be calculated exactly. Both the theoretical analysis and numerical results demonstrate that the proposed method offers a high degree of accuracy.