土-结构相互作用对储液结构动力反应的影响研究  

INFLUENCE ANALYSIS OF SOIL-STRUCTURE INTERACTION ON THE DYNAMIC RESPONSE OF STORAGE TANKS

作　　者：宝鑫[1] 刘晶波[1] 李述涛 王菲 BAO Xin;LIU Jing-bo;LI Shu-tao;WANG Fei(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：《工程力学》2021年第S01期125-132,共8页Engineering Mechanics

基　　金：博士后创新人才支持计划项目(BX20200192);中国博士后科学基金项目(2020M680575);清华大学“水木学者”计划项目(2020SM005);国家自然科学基金项目(51878384);国家重点研发计划项目(2016YFC1402800)。

摘　　要：该文建立了考虑土-结构动力相互作用和流固耦合效应的储液结构-土体近场有限元模型,利用人工边界技术模拟半无限地基的波动辐射效应,采用人工边界子结构法实现地震波在近场模型中的输入,在此基础上,研究了土-结构动力相互作用对储液结构地震反应的影响。研究结果表明,考虑土-结构相互作用时,储液结构-液体耦联自振频率整体向低频方向移动,且与不考虑土-结构相互作用的模型相比,出现了额外的有土体参与的自振模态。受地震波频谱成分和储液结构自振频率变化的影响,在不同输入地震波和储液量下,土-结构相互作用对结构地震反应峰值呈现不同的影响规律。对于峰值地震反应过后的后续波动,当考虑土-结构相互作用时,由于下部土体与结构相互作用产生的散射波不断向外部辐射扩散,并最终被人工边界吸收,导致储液结构及其内部水体的振动幅值快速衰减。A near-field finite element model of a storage tank that considers soil-structure dynamic interaction and fluid-solid coupling effect is established in this study.Artificial boundaries are adopted to simulate the wave radiation effect of the semi-infinite foundation.The seismic wave input method based on the substructure of the artificial boundary is used to input the seismic waves into the numerical model.Then,the influence of soil-structure dynamic interaction on the seismic response of the liquid storage tank is investigated.The results show that the natural frequencies of the storage tank-liquid coupled system become lower when the soil-structure interaction is considered.Compared with the model without considering soil-structure interaction,there are additional vibration modes in which the soil participates.Affected by the different spectral components of the incident seismic waves and the change of the natural frequencies of the liquid storage tank,soil-structure interaction has different influences on the peak seismic response under different incident seismic waves and liquid storage volumes.For the subsequent responses after the peak seismic response,the scattered waves generated by the interaction between the foundation and the storage tank propagate outward and are eventually absorbed by the artificial boundaries when considering soil-structure interaction.It results in a rapid attenuation of the subsequent vibration amplitudes of the storage tank and the internal liquid.

关 键 词：储液结构 土-结构相互作用 流固耦合 人工边界 地震波动输入 

分 类 号：TU311.3[建筑科学—结构工程]