大跨度双层柱面网壳结构的非线性有限元可靠度、相关性及灵敏度分析  

Nonlinear Finite Element Analysis on Reliability,Correlation and Sensitivity of Large-Span Double-Layer Cylindrical Lattice Shell

作　　者：柳春光[1,2] 李会军[2] 

机构地区：[1]大连理工大学海岸和近海工程国家重点实验室,大连116024 [2]大连理工大学建设工程学部,大连116024

出　　处：《天津大学学报》2010年第3期239-248,共10页Journal of Tianjin University(Science and Technology)

基　　金：国家自然科学基金资助项目(59908013)

摘　　要：在非线性有限元可靠度分析中,对于特定的材料模型,约束函数会有不连续的梯度,它将导致搜索过程的不收敛.鉴于此,在大跨度空间结构的可靠度、相关性及敏感性计算中引入了两种光滑材料模型,通过引入的光滑材料模型及应用4种搜索验算点的方法使得非线性有限元可靠度计算在满足计算精度的情况下更易收敛,耗时更少,并且使得按照常规方法不能收敛的问题也变得收敛;对双层柱面网壳整体进行系统可靠度计算,研究了响应量间的相关性,得出一些有价值的结论.结果表明,引入的光滑材料模型在大跨度空间结构的可靠度与敏感性分析中简单易行,效率精度较高.In nonlinear finite element reliability analysis, searching process usually does not converge due to discon- tinuous gradient of constraint function for certain material models. Hence, two smoothed material models are pre- sented in reliability, correlation and sensitivity analysis of large-span space lattice structure. The two smoothed mate- rial models presented and the four algorithms searching design points can make nonlinear finite element reliability analysis more convenient and efficient, and address certain convergence problems that can not be solved by traditional methods. System reliability and correlation between response quantities of double-layer cylindrical shells are con- ducted, and some valuable conclusions are drawn. Results show that smoothed material models presented are simple, efficient and precise in nonlinear finite element reliability and sensitivity anglysis in large-span space lattice structure.

关 键 词：大跨度双层柱面网壳 可靠度 敏感性 相关性 单轴光滑双线性材料 单轴Bouc-Wen材料 

分 类 号：TU318[建筑科学—结构工程] TU33