屋面系统对单层球面网壳稳定性及地震响应的影响研究

单层球面网壳的静力稳定性及抗震性能已经取得较为系统的研究成果，但在传统的研究方法中，学者们只考虑结构部分，忽略了屋面板、吊顶、隔墙等非结构构件的影响；其中，屋面系统作为一类非结构构件，其平面刚度较大、在动力荷载下的阻尼也较大的特点会在一定程度上影响结构的受力特性。因此，选取考虑屋面系统的单层球面网壳作为研究对象，开展屋面系统对于单层球面网壳弹塑性稳定性及抗震性能的影响研究。采用有限元分析软件ABAQUS分别建立带屋面系统单层球面网壳和传统单层球壳的数值模型；通过弧长法分别对两种模型进行均布荷载作用下的非线性数值模拟，对比分析屋面系统对单层球面网壳弹塑性稳定承载力的影响；对考虑屋面系统的网壳结构进行不同地震荷载作用下的时程动力分析，采用基于响应的分析方法，考察屋面系统对于网壳结构抗震性能的影响，得到屋面系统会显著提高网壳整体刚度、增强结构抗震能力的结论；本研究可为以后网壳结构的理论研究及工程实践提供一定的参考。

Effect of roof system on elasto-plastic stability and seismic performance of single-layer reticulated shells

Single-layer reticulated shells under static/dynamic loads have been widely studied in the past decades. But in the traditional methods, only the structural components were considered, while the non-structural components such as roof, ceiling, partition, etc., were ignored. Roof system as a type of non-structural component, however, its stiffness is not weak and its damping under the dynamic load is large, which somehow make it play an important role in the static/dynamic analysis. Consequently, the effect of roof system on elasto-plastic stability and seismic responses were investigated in this work. Firstly, the numerical models for single-layer reticulated shell and single-layer reticulated shell with roof system considered were generated using the finite element software ABAQUS. Secondly, the arc-length method was used for the nonlinear numerical simulation of two models of single-layer reticulated shell under uniformly distributed loads. The ultimate bearing capacity of the shell with roof system considered was compared to those of the traditional methods. Finally, the dynamic time-history analysis for the single-layer reticulated shell with roof system considered was conducted under different seismic actions. The analysis results indicate that the roof system may significantly enhance the stiffness and the seismic performance of single-layer reticulated shells.