考虑土-结构相互作用永祚寺文峰塔地震响应分析  

Seismic response analysis of Wenfeng Pagoda in Yongzuo Temple considering SSI

作　　者：安一劲 韩鹏举[1] 白向灵 秦健栋 何斌[1] 李晋芳 AN Yijing;HAN Pengju;BAI Xiangling;QIN Jiandong;HE Bin;LI Jinfang(College of Civil Engineering,Taiyuan University of Technology,Taiyuan 030024,China;Taiyuan Institute of Cultural Relics Protection,Taiyuan 030025,China)

机构地区：[1]太原理工大学土木工程学院,太原030024 [2]太原市文物保护研究院,太原030025

出　　处：《振动与冲击》2024年第15期105-116,168,共13页Journal of Vibration and Shock

基　　金：山西省文物局科技项目(RH2100001662)。

摘　　要：为研究土-结构相互作用对古塔地震响应的影响,借助ABAQUS有限元软件通过对地基土施加黏弹性边界,建立了不考虑土-结构相互作用(soil-structure interaction, SSI)效应、SSI效应下不考虑基础与地基土分离滑移与SSI效应下考虑分离滑移三种模型,通过时程分析法对比分析了SSI效应对山西省永祚寺文峰塔动力特性与破坏形态及损伤的影响。结果表明:考虑SSI效应后古塔高阶自振频率显著降低,其水平位移与层间位移角将总体增大,水平加速度放大系数呈下降趋势,塔下层损伤明显加剧且上层损伤有所降低,基础损伤明显;在设防地震作用下基础与地基土分离滑移现象加剧,有将沿中和轴破坏的风险,底层塔檐为薄弱部分,且基础的损伤不容忽视。分析结果对于预测高层密檐塔损伤破坏具有参考作用。Here,to study effects of soil-structure interaction(SSI)on seismic response of ancient pagoda,3 models including the one without considering SSI effect,the one under SSI effect without considering separation slip between foundation and foundation soil and the one under SSI effect considering separation slip were established by using the finite element software ABAQUS to exert viscoelastic boundaries to foundation soil.Effects of SSI effect on dynamic characteristics,failure mode and damage of Wenfeng Pagoda in Yongzuo Temple,Shanxi Province of China were analyzed contrastively with the time history analysis method.The results showed that after considering SSI effect,high-order natural frequencies of the ancient pagoda drop significantly,its horizontal displacement and inter-story displacement angle can increase overall,its horizontal acceleration amplification coefficient has a downward trend,and the pagoda’s lower layer damage obviously increases while its upper layer damage decreases,foundation damage is obvious;under action of seismic fortification,separation sliding phenomenon between foundation and foundation soil intensifies with a risk of failure along neutral axis,eaves of bottom pagoda are weak part,and foundation damage can’t be ignored;the analysis results have reference value for predicting damage and failure of high-rise dense eaves pagoda.

关 键 词：砖石古塔 土-结构相互作用(SSI) 地震响应 黏弹性边界 

分 类 号：TU311.3[建筑科学—结构工程]