【摘要】 基于OpenSEES软件平台,建立了凯威特型单层球面网壳的纤维模型,通过增量动力分析方法,研究了球面网壳的塑性发展过程,判定了网壳结构的破坏类别;通过分析杆件纤维应力随时间的变化,杆件的塑性发展,以及失效杆件的位置分布,揭示单层球面网壳结构的倒塌机理。在此基础上,分析了跨度、矢跨比以及屋面质量对地震作用下单层球面网壳极限承载力的影响,可为工程设计提供参考。更多还原

【Abstract】 In this study, the model of a single-layer spherical reticulated shell is established with the fiber model using program OpenSEES. The plastic developing process and the seismic failure mode are studied with the incremental dynamic analysis. Based on the analyses on the change of fiber stress over time, the plastic development of the elements and the distribution of the failure elements, the collapse mechanism of the single-layer spherical reticulated shell structure is revealed. Moreover, the effects of span, rise-span ratio and roof load on ultimate bearing capacity of single-layer reticulated shells under earthquakes are analyzed, which can provide reference for the engineering design.更多还原