施威德勒穹顶弹塑性稳定性能研究

Research on Behavior of Elasto-Plastic Stability of Schwedler Domes

通过有计划地对400余例实际尺寸的施威德勒型单层球面网壳进行双重非线性全过程分析,求得网壳的极限承载力,系统地考察了初始缺陷和荷载不对称以及考虑材料非线性等因素对网壳稳定性能的影响,较全面了解了施威德勒型单层球面网壳弹塑性稳定的规律性,为此类网壳结构的工程实践提供了理论依据和设计参考。并得出以下几点结论:(1)为保证网壳的安全性,网壳的极限承载力应由双重非线性全过程分析确定。(2)施威德勒穹顶属于缺陷敏感性结构。(3)竖向荷载不对称分布对网壳极限承载力影响较小。(4)工程设计中应适当考虑支承条件变化对网壳极限承载力的影响。

More than 400 tests for the complete - process analysis considering geometry nonlinearity and material nonlinearity of Schwedler single - layer latticed domes with various geometries have been carried out and the critical load is obtained. The effect of initial imperfection, asymmetric load distribution, especially the effect of material nonlinearity on the stability behavior of this kind of domes is considered, and the rule about the elasto - plastic stability behavior is concluded. Based on the work introduced in present paper, people can get useful information for engineering design or theoretical study. And some conclusions could be drawn ： （ 1 ） To ensure security of the dome, the critical load of the dome must be confirmed by the complete -process analysis considering geometry nonlinearity and material nonlinearity; （2） Schwedler single - layer latticed domes belongs to structure of imperfection sensitivity ; （3） The critical load of the dome is affected a little by the asymmetric load distribution; （4）The effect of change of supporting condition on the critical load of the dome should be considered properly in engineering design .