肋环斜杆型球面网壳弹塑性稳定特性

Elasto-plastic stability behavior of schwedler domes

为掌握肋环斜杆型球面网壳的弹塑性稳定特性,利用ANSYS软件有计划地对430余例实际尺寸的肋环斜杆型单层球面网壳进行了双重非线性全过程分析,求得结构的极限承载力,系统地考察了初始缺陷、荷载不对称分布、支承条件以及材料非线性等因素对网壳稳定性能的影响,并与弹性分析结果进行了对比分析.通过大规模参数分析研究,较全面了解肋环斜杆型单层球面网壳弹塑性稳定的规律性,统计了肋环斜杆型单层球面网壳的材料非线性折减系数,为此类网壳结构的工程实践提供了理论依据和设计参考.

In order to get further understanding of the elasto - plastic stability behavior, more than 430 exampies for the complete - process analysis considering geometry nonlinear and material nonlinear of Schwedler single -layer latticed domes with various geometric parameters have been carried out and the critical load is concluded. The effect of initial imperfection, asymmetric load distribution, supporting conditions, especially the effect of material nonlinear to the stability behavior of this kind of domes is considered, and through the comparisons between the results of elasto - plastic analysis and elastic analysis, rules about the elasto - plastic stability behavior is concluded. Based on the work, material nonlinear reduced coefficient for this kind of domes is pointed out, with some useful information for engineering design or theoretical study.