三峡大学学报（自然科学版）2024，Vol.46Issue(1)：36-42,7.DOI:10.13393/j.cnki.issn.1672-948X.2024.01.006
含软弱夹层场地的一维等效线性化地震响应研究
One-Dimensional Equivalent Linearized Seismic Response Analysis for Sites with Soft Interlayer
摘要
Abstract
In order to investigate the influence of weak interlayer on the seismic response of a site and clarify the impact of weak interlayer on the site,a one-dimensional site model is constructed based on the equivalent linearization method.The response of the site under different amplitude bedrock seismic inputs is calculated,and the peak ground acceleration(PGA)and Fourier spectrum of the seismic waves at the site under various seismic conditions are obtained.The change of spectral ratio curve around the natural frequency of the site and the attenuation of different frequency bands by the weak interlayer are analyzed.The reason for the decrease in ground acceleration based on the hysteresis theory is explored.The research results show that when subjected to seismic action,the shear modulus of the weak interlayer in the site decreases and the damping ratio increases,resulting in large strains in the weak interlayer and the consumption of high-frequency seismic energy,which causes the PGA of the seismic waves transmitted to the ground surface decreases as well.Furthermore,when the seismic intensity of the input bedrock increases,the amplification factor curve of the ground surface PGA shows a gradually decreasing and stabilizing trend.关键词
软弱夹层/等效线性化/地震响应/PGAKey words
weak interlayer/equivalent linearization method/seismic response/peak ground acceleration分类
建筑与水利引用本文复制引用
唐俭政,张齐,黄颖婷,崔如玉,彭刚..含软弱夹层场地的一维等效线性化地震响应研究[J].三峡大学学报（自然科学版）,2024,46(1):36-42,7.基金项目
国家自然科学基金面上项目(52079072) （52079072）
