考虑地基土体刚度变化的软土地基石结构地震响应分析  

Analysis of Seismic Response of Stone Structures of Soft Earth Foundation Considering the Stiffness Change of Foundation Soil

作　　者：刘永平 LIU Yongping(China Construction Fulin Group Co.,Ltd.,Quanzhou,Fujian 362000,China)

机构地区：[1]中建富林集团有限公司,福建泉州362000

出　　处：《水利与建筑工程学报》2024年第5期30-37,45,共9页Journal of Water Resources and Architectural Engineering

基　　金：福建省住房和城乡建设厅科技开发研究项目(2023-B-07,2023-K-47,2022-K-118)。

摘　　要：福建沿海地区部分石结构民宅建立于软弱场地上,而软土地基上的既有石结构抗震加固又缺乏相关研究资料。为探究考虑软土地基的土-结构相互作用(SSI)效应的不同土体刚度条件下既有石结构的动力特性和地震响应,选择有限元软件LS-DYNA建立土-结构耦合体系模型和对比的刚性地基模型,进行软土地基石结构地震响应分析。结果表明:软土地基对地震动具有明显的滤波效应和放大效应;地基土体刚度变化改变了石结构楼层破坏顺序;地基土体刚度变化对石结构动力特性和地震响应有显著影响,反应在当土体越软,结构层间位移角越大,加速度响应反而略有减小。In the coastal areas of Fujian Province,some stone structures were built on soft ground.Previous studies have shown that the soil-structure interaction(SSI)effect of soft foundation can lead to an increase in the seismic response of structures.In order to investigate the dynamic characteristics and seismic response of existing stone structures with different soil stiffness conditions considering the SSI effect,the finite element software LS-DYNA was used to establish a coupled soil-structure system model and a comparative rigid foundation model.The results show that the soft foundation has a significant filtering and amplification effect on seismic motion;the order of floor collapse in the stone structure may change with changes in the soil stiffness;the soil stiffness change has a significant impact on the dynamic characteristics and seismic response of the stone structure,as evidenced by the fact that the inter-story displacement angle increases as the soil becomes softer,and the acceleration response actually decreases slightly.

关 键 词：石结构 软土地基 土-结构相互作用 土体刚度 地震响应 

分 类 号：TU363[建筑科学—结构工程]