考虑潟湖影响的岛礁场地地震反应分析  

Seismic response analysis on reef site considering influence of lagoon

作　　者：刘晶波[1] 宝鑫[1] 李述涛 赵启明 王菲 王东洋[1] LIU Jingbo;BAO Xin;LI Shutao;ZHAO Qiming;WANG Fei;WANG Dongyang(Department of Civil Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[1]清华大学土木工程系,北京100084

出　　处：《计算机辅助工程》2020年第2期46-50,69,共6页Computer Aided Engineering

基　　金：国家自然科学基金(51878384);国家重点研发计划(2018YFC1504305)。

摘　　要：建立简化的岛礁-潟湖-海水系统地震反应分析模型,重点分析考虑潟湖影响下岛礁场地的地震反应规律。研究结果表明,潟湖对岛礁临湖侧水平向地震反应的放大作用较为显著,考虑潟湖影响时临湖侧角点的峰值加速度是不考虑潟湖影响时该点峰值加速度的138.6%;随着潟湖水深的增加,临湖侧的地震反应进一步增大;入射波经岛礁-潟湖-海水系统传至礁坪时,中周期的频率成分被过滤,反应谱峰值有向短周期方向移动的趋势。本文研究结果可为进一步确定岛礁场地地震参数提供参考。A simplified seismic response analysis model for the reef-lagoon-seawater system is established,and the seismic response regular of the reef site considering the influence of lagoon is specially studied.The results show that the amplification effect of lagoon on the horizontal seismic response of the reef lakeside is significant,the peak acceleration at the lakeside corner when considering the influence of lagoon is 138.6%larger than that of the not-considering one.The seismic response magnifies with the increase of the lagoon depth.When the incident wave propagates through the reef-lagoon-seawater system to the reef flat,the frequency components of the medium period are filtered,and the peak of the acceleration response spectrum tends to move toward the short period.The study results can provide some insights for further research of determining the ground motion parameters of the reef site.

关 键 词：岛礁 潟湖 地震波输入 场地地震反应 人工边界 

分 类 号：TP391.92[自动化与计算机技术—计算机应用技术] P315.31[自动化与计算机技术—计算机科学与技术]