考虑土-结构相互作用双层柱面网壳在多点输入下的地震反应分析

目前对于网壳结构的地震反应研究大部分仍然采用一致输入,特别是没有考虑土-结构相互作用对网壳结构的影响。本文通过对大型有限元分析软件MSC.Nastran的二次开发,用等效线性化方法考虑土体的非线性,对土体采用三维实体单元建模,并对土体在基岩面上采用地震动的多点输入,计算分析了大跨度双层柱面网壳的动力反应,并且与一致地震动输入下网壳结构的地震反应进行了对比,考察了两者之间的差异,深入分析了考虑土-结构相互作用下,双层柱面网壳结构在多点输入和一致输入下的地震反应规律,并得出了一些重要结论。

Seismic response analysis of double-layer cylindrical reticulated shell under multiple-support excitations considering dynamic soil-structure interaction

At present,the uniform seismic excitation is still assumed.In fact,multi-support excitations and soil-structure interaction should be used in dynamic response analysis of reticulated shells.In this paper,seismic responses of long-span double-layer cylindrical reticulated shell under multiple-support excitations considering soil-structure interaction are studied by secondly development of MSC.Nastran finite element software.The equivalent linearization method is used to consider soil nonlinearity.The soil model is formed by three-dimensional solid element.And the result is compared with that under uniform excitation.The rule of seismic response of reticulated shell under multiple-support excitations considering soil-structure interaction are analyzed deeply,and some important conclusions are drawn.