地震作用下地下商业街结构动力反应的影响因素分析

INFLUENCE FACTORS ANALYSIS ON DYNAMIC RESPONSE OF UNDERGROUND COMMERCIAL STREET STRUCTURE UNDER SEISMIC EXCITATIONS

为研究在不同类型的地震波作用下软土场地中地下商业街结构的地震反应及其影响因素,该文以上海软土场地中某单层地下商业街结构为背景,采用ANSYS软件建立场地土与地下商业街结构相互作用体系的三维有限元分析模型,通过引入三维等效粘弹性人工边界单元,以不同类型的地震波作为输入,对地下商业街结构地震反应的影响因素进行了分析,探讨了地下商业街结构埋深、土体刚度和输入地震波选取对结构地震反应的影响。该文的算例结果表明:地下商业街结构地震反应存在最不利埋深;土体刚度对地下商业街结构地震反应值的影响明显;长周期地震波作用下地下商业街结构的地震反应值明显大于普通地震波作用的结果。

The dynamic response of an underground-commercial-street structure subjected to different types of seismic waves and corresponding influence factors are studied. Based on a monolayer underground- commercial-street structure, the three-dimensional finite element model with three-dimensional equivalent viscoelastic boundary element of a soil-underground structure-interaction system is established, then the structural dynamic response is calculated with different types of seismic excitations, and the effect of buried depth, soil stiffness, and seismic input types are discussed. The results indicate that： for the seismic response of such underground structure, there is most unfavorable buried depth; soil stiffness has a significant impact; seismic response value under long-period seismic waves is significantly larger than that under ordinary seismic waves.