地震工程学报2017，Vol.39Issue(5)：883-889,7.DOI:10.3969/j.issn.1000-0844.2017.05.0883
基于FLAC3D的土层非线性地震反应分析
Nonlinear Seismic Response Analysis of Soil Layers Based on FLAC3D
摘要
Abstract
To validate the effect of FLAC3D software on the seismic response analysis of soil,we used the No.3 logging site (class II site) in Xiangtang Town,Tangshan City as an experimental site and analyzed its seismic response using FLAC3D software and an equivalent linearization method.The calculation results show that FLAC3D software method is feasible.Then taking a class IV site in Tanggu District,Tianjin City as an example,the two methods are used to calculate the ground motion peak values and ground response spectra under different ground motion input intensities.The results show that the results calculated via FLAC3D and the equivalent linearization method have little difference when the intensity of input ground motion is relatively small;moreover,FLAC3D overcomes the problem of a long characteristic period of ground response spectrum when the input ground motion intensity is large.When using the equivalent linearization method,this problem occurs because of an underestimation in ground seismic response (high frequency) and an overestimation in soil nonlinearity.Therefore,the results obtained from the FLAC3D method may be more appropriate for engineering practice.关键词
FLAC3D/土层地震反应分析/等效线性化/IV类场地Key words
FLAC3D/seismic response of soil layer/equivalent linearization/class IV site分类
天文与地球科学引用本文复制引用
苏建锋..基于FLAC3D的土层非线性地震反应分析[J].地震工程学报,2017,39(5):883-889,7.基金项目
中国综合地球物理场观测——大华北地区项目(201508009) （201508009）
科技部基础工作专项(2015FY210400) （2015FY210400）
