基于APDL语言的网架结构优化设计

Optimum design of lattice grid structure basing on APDL language

本文以周边简支的斜放四角锥网架屋盖为例,将网架高度和杆件截面积同时作为离散型设计变量,以网架结构的重量为目标函数,在满足杆件截面强度、刚度、稳定以及结构变形等约束的条件下,采用一维搜索算法与改进的应力比法相结合的方式,利用ANSYS参数化设计语言APDL编制网架优化程序。实例结果表明优化后网架重量降低了约14.1%,因此该方法能取得较好的优化效果,并且简单易于操作。

The design process of structure optimization was discussed with an example of a diagonal square pyramid space grids simply supported at its perimeter. The grid structure height and member cross section dimensions of space truss were taken as the discrete variable variables.The total weight of space truss was considered as the objective function.The restrain condition such as strength,stability,stiffness and the structural deformation were considered.The one-dimensional search method and the modified stress ratio method are adopted as the optimization method and draw up optimization of the space truss structure making up with ANSYS Parameter Design Language（APDL）.The calculated results showed that the weight of space truss reduced by 14.1%.Thus the optimum design can obtain a better optimal result and simple for use.