A seismic free field input model for FE－SBFE coupling in time domain

• Published in: Earthquake Engineering and Engineering Vibration 2003-06, Vol.2 (1), p.51-58
• Main Author: 阎俊义 金峰 徐艳杰 王光纶 张楚汉
• Format: Article
• Language: English
• Subjects: Acceleration; Analysis; Canyons; Computer applications; Coupling; Earthquakes; Elastic half spaces; Finite element analysis; Impulse response; Nonlinear response; Procedures; Response analysis; Response functions; Seismic activity; Seismic engineering; Seismic response; SH waves; Soil; Soil analysis; Soil-structure interaction; Soils; Time domain analysis; 动力学; 土-结构相互作用; 地震作用; 时域分析; 有限元法
• ISSN: 1671-3664; 1993-503X
• DOI: 10.1007/BF02857538

A seismic free field input formulation of the coupling procedure of the finite element (FE) and the scaled boundary finite-element(SBFE) is proposed to perform the unbounded soil-structure interaction analysis in time domain.Based on the substructure technique, seismic excitation of the soil-structure system is represented by the free-field motion ofan elastic half-space. To reduce the computational effort, the acceleration unit-impulse response function of the unbounded soil is decomposed into two functions: linear and residual. The latter converges to zero and can be truncated as required.With the prescribed to lerance parameter, the balance between accuracy and efficiency of the procedure can be controlled.The validity of the model is verified by the scattering analysis of a hemi-spherical canyon subjected to plane harmonic P, SV and SH wave incidence. Numerical results show that the new procedure is very efficient for seismic problems within a nor-mal range of frequency. The coupling procedure presented herein can be applied to linear and nonlinear earthquake re-sponse analysis of practical structures which are built on unbounded soil.