| 樊 旭.柱面网壳结构双非线性稳定分析[J].水泥工程,2026,39(4):78-81 |
| 柱面网壳结构双非线性稳定分析 |
| Double nonlinear stability analysis of cylindrical latticed shell structure |
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| DOI： |
| 中文关键词: 双层柱面网壳 有限元分析 双非线性稳定分析 |
| 英文关键词: double-layer cylindrical lattic shell finite element analysis dual nonlinear stability analysis |
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| 中文摘要: |
| 基于有限元软件SAP2000，对工业厂房中常用的双层柱面网壳结构开展弹塑性稳定分析，考虑初始缺陷影响，探讨其几何非线性与材料非线性屈曲行为。其中，特征值屈曲分析表明，前六阶失稳模态均表现为整体失稳，最大竖向挠度位于波峰，失稳区域集中于纵向中间区域的跨中杆件处。几何非线性分析显示，失稳变形呈对称特征，最大变形位于跨中杆件区域，基底反力时程曲线先线性后塑性，达到突变点后基底反力下降，结构失稳。双非线性分析下承载能力显著降低，但塑性铰发展处于IO性能水平以下，未出现明显损坏，安全系数K>2，满足规范要求。 |
| 英文摘要: |
| Based on finite element software SAP 2000, this study investigates the elastoplastic stability of double-layer cylindrical latticed shells commonly used in industrial buildings, accounting for initial geometric imperfections. Eigenvalue buckling analysis reveals that the first six instability modes are global, with maximum vertical deflection occurring at the wave crests. Instability is concentrated in the mid-span members adjacent to the gables at both longitudinal ends. Geometric nonlinear analysis yields symmetric deformation patterns, with maximum displacement localized at the mid-span. The base reaction time-history curve exhibits linear behavior followed by a plastic response; beyond the tipping point, the base reaction decreases with increasing load, indicating structural instability. Under bi-nonlinear analysis (incorporating both geometric and material nonlinearities), the load-carrying capacity is substantially reduced. Nevertheless, plastic hinge development remains below the Immediate Occupancy (IO) level, with no visible damage. The safety factor K exceeds 2, thereby satisfying relevant code requirements. |
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