不同支承条件下两类单层网壳地震响应随PGA的变化规律  

Variation of seismic response of two types of single-layer reticulated shells with PGA under different supporting conditions

作　　者：孙震阳 王宁 刘璐 白文彪 SUN Zhen-yang;WANG Ning;LIU Lu;BAI Wen-biao(College of Civil and Architectural Engineering,North China University of Science and Technology,Tangshan 063210,China;Light Industry College,North China University of Science and Technology,Tangshan 063000,China)

机构地区：[1]华北理工大学建筑工程学院,河北唐山063210 [2]华北理工大学轻工学院,河北唐山063000

出　　处：《空间结构》2024年第3期27-33,43,共8页Spatial Structures

基　　金：河北省高校自然科学研究青年基金项目(QN2020170)。

摘　　要：采用ABAQUS有限元软件建立两种采用不同支承(考虑和不考虑山墙)的单层柱面网壳模型,对比两种模型的动力响应差异,及其随PGA的变化规律,并进一步对比两种支承下梁单元和壳单元两类网壳的动力特性.两类模型的主要差别为是否能考虑球节点的刚度,模型均考虑SSI的影响.由两种支承方式下壳单元模型之间的位移-时程曲线可知,考虑山墙作用的壳单元模型由于网壳与山墙之间的作用力加剧了支承处构件的变形,相较于不考虑山墙的壳单元模型,大大降低了结构的稳定性;节点刚度对不同支承条件下结构的动力特性影响很明显,当不考虑山墙作用时,梁单元模型的整体稳定性比壳单元模型要好得多.Through finite element software ABAQUS,a single-layer cylindrical reticulated shell model with two different supporting conditions(considering or ignoring the gable)was established,and the dynamic response difference between the two models was compared.As the difference changes with the increase of PGA,the dynamic characteristics of two types of reticulated shells with beam element and shell element under two kinds of supports were compared.The main differences between the two types of models lie in whether stiffness of the spherical joint can be considered.The influence of SSI is considered in both models.From the displacement time-history curve between the shell element models under two supporting conditions and the dynamic response of the two models,it can be concluded that the shell element model considering gable effect aggravates the deformation of the members at the support due to the force between the reticulated shell and the gable.Compared with the shell element model without considering the gable,the stability of the structure is greatly reduced.The joint stiffness has obvious influence on the dynamic characteristics of the structure under different supporting conditions.When the gable effect is not considered,the overall stability of the beam element model is much better than that of the shell element model.

关 键 词：单层网壳 精细化模型 支承方式 土-结构相互作用 

分 类 号：TU393.3[建筑科学—结构工程]