结合跨度为27 m的封闭式门式刚架奶牛舍结构工程实例，以用钢量最少为目标函数，借助有限元分析软件ANSYS，对门式刚架进行了结构优化设计，优化后刚架减重效果明显，单榀用钢量节省20.68%，经济效益明显。%Analysis and study being in progress to the span for 27 m cows house,this dissertation establishes mathematical model by regarding the least steel consumption as goal function,by finite element analysis software ANSYS. The portal frame is analysis according to the technical specification for steel structure and the model situation with the elasticity analysis method. After optimization the portal frame is reduced obvious-ly to a weight of 20. 68 percent and have noticeable economic effect.
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