基于多尺度模型的单层球面网壳结构静力稳定性分析

网壳等大跨度空间结构在实际工程中得到广泛运用,静力稳定性是结构安全分析的重要内容之一。为研究静力荷载作用下网壳结构的稳定性,以单层球面网壳结构为研究对象,基于多尺度有限元建模方法,通过分别采用薄弱区域节点细化模型、薄弱区域杆件细化模型和全梁单元模型对结构在静力荷载作用下的稳定性进行分析。结果表明,杆件细化与节点细化的多尺度模型可以跟踪杆件的局部凹陷和节点变形等,更接近实际,在结构静力稳定性的数值模拟方面具有更高的准确度。

Static Stability Analysis of Single Layer Spherical Reticulated Shell Structure Based on Multi-Scale Model

Large-span spatial structures such as reticulated shells are widely used in practical engineering. Static stability is one of the important contents of structural safety analysis. In order to study the stability of the reticulated shell structure under static loading, a single-layer spherical reticulated shell structure is studied. Based on the multi-scale finite element modeling method, the weak-area joint refinement model, the weak-area rod refinement and the full beam element model are respectively adopted to analyze the stability of the structure under static loading. The results show that the multi-scale model of rod refinement and joint refinement can track the local depression of the rod and the deformation of the joint, which is closer to reality and has higher accuracy in numerical simulation of structural static stability.