Soil seismic analysis for 2D oblique incident waves using exact free-field responses by frequency-based finite/infinite element method  

作　　者：Yeong-Bin Yang Zeyang Zhou Xiongfei Zhang Xiaoli Wang 

机构地区：[1]School of Civil Engineering,Chongqing University,Chongqing 400045,China [2]MOE Key Laboratory of New Technology for Construction of Cities in Mountain Area,Chongqing University,Chongqing 400045,China [3]School of Civil Engineering and Architecture,Chongqing University of Science and Technology,Chongqing 400045,China

出　　处：《Frontiers of Structural and Civil Engineering》2022年第12期1530-1551,共22页结构与土木工程前沿（英文版）

基　　金：sponsored by the following agencies:National Natural Science Foundation of China(Grant No.52078082);Chongqing Science and Technology Commission(No.cstc2019yszx-jcyjX0001,cstc2020yszx-jscxX0002,and cstc2021yszxjscxX0001).

摘　　要：The seismic analysis of a viscoelastic half-space under two-dimensional(2D)oblique incident waves is carried out by the finite/infinite element method(FIEM).First,the frequency-domain exact solutions for the displacements and stresses of the free field are derived in general form for arbitrary incident P and SV waves.With the present formulation,no distinction needs to be made for SV waves with over-critical incident angles that make the reflected P waves disappear,while no critical angle exists for P waves.Next,the equivalent seismic forces of the earthquake(Taft Earthquake 1952)imposed on the near-field boundary are generated by combining the solutions for unit ground accelerations with the earthquake spectrum.Based on the asymmetric finite/infinite element model,the frequency-domain motion equations for seismic analysis are presented with the key parameters selected.The results obtained in frequency and time domain are verified against those of Wolf’s,Luco and de Barros’and for inversely computed ground motions.The parametric study indicated that distinct phase difference exists between the horizontal and vertical responses for SV waves with over-critical incident angles,but not for under-critical incident angles.Other observations were also made for the numerical results inside the text.

关 键 词：oblique incident waves critical angle HALF-SPACE finite/infinite element approach seismic response analysis 

分 类 号：P31[天文地球—固体地球物理学]