非对称荷载对大跨度非规则单层网壳结构性能的影响

以某大跨度非规则单层网壳为研究背景,应用ANSYS通用有限元分析软件对网壳结构进行了建模并重点模拟了风荷载、雪荷载、温度效应等多种非对称荷载作用,进行了静力分析、特征值屈曲分析以及非线性稳定分析。得到了网壳结构在15种典型荷载组合下的内力、位移结果,分析了非对称荷载对网壳结构静力性能的影响;考虑了几何非线性、材料非线性、初始缺陷,得到了网壳结构在非对称荷载作用下的稳定系数,分析了非对称荷载对网壳结构稳定性能的影响。强调指出非对称荷载作用在大跨度单层网壳结构设计中的重要性,为大跨度非规则单层网壳设计提供参考。

The Effect of Asymmetrical Loads on the Structural Performance of Large-Span Anomalous Single-Layer Reticulated Shell

Aiming at the background of a large-span anomalous single-layer reticulated shell,the general purpose finite element method program ANSYS was used to model and emphatically simulate several asymmetrical static loads of the shell structures,such as wind load,snow load and temperature effect.Then static analysis,eigenvalue buckling analysis and nonlinear stability analysis were made to analyze the relative mechanical performance of the shells.The internal force and displacement results under fifteen traditional load combinations were obtained and the effect of asymmetrical loads on static behavior was studied.Taking into account the influence of geometrical nonlinearity,material nonlinearity,initial geometrical imperfection,the stability factors of the shell structure under asymmetrical load were calculated.The influence of asymmetrical loads on nonlinear stability properties were investigated.The purposes of this paper were to emphasize the importance of asymmetrical loads analysis in the design of a long-span anomalous single-layer reticulated shell and to offer a reference.