开孔双层球面网壳结构的优化设计分析

Structural Optimal Design of Double-Layer Reticulated Spherical Latticed Shell with Openings

以某火力发电厂干煤棚双层球面网壳结构为工程背景,以结构用钢指标为目标函数,利用有限元软件ANSYS对该开孔双层网壳结构进行弹性阶段的整体优化计算,优化后节省钢材约28.4%;进一步应用ANSYS参数化设计语言(APDL)进行编程,分析了网壳矢高、网壳厚度和杆件截面面积三个因素对用钢指标的影响规律:本网壳结构用钢指标对网壳厚度变化最为敏感,杆件截面面积变化的影响次之,矢高变化对结构用钢指标影响最小。

Taking a double-layer reticulated spherical shell structure of dry coal shed of a thermal power plant as the object,the finite element software ANSYS was used to calculate the overall optimization of the structure in the elastic phase with the structural steel index as the objective function,and the steel saving was about 28.4%after the optimization.ANSYS parametric design language(APDL)programming is applied to analyze the effects of three factors,namely,shell vector height,shell thickness and rod cross-sectional area,on the steel index.It is concluded that the index is most influenced by the shell thickness,then by the rod cross-sectional area,and the shell vector height has the least influence.The calculation results will provide a reference for the optimal design of such shell structure.