中文摘要：

以通用有限元分析软件ANSYS作为运行环境,将网架结构的杆件截面面积作为离散的设计变量,以网架结构的总质量为目标函数,同时考虑网架的强度、刚度、稳定性以及截面尺寸等约束条件,采用一维搜索方法和改进的应力比法等优化方法,对网架结构进行了优化. 工程实例计算表明：该优化算法原理简单,收敛速度快,能在保证安全的基础上降低工程造价,取得较好的优化设计结果.

英文摘要：

The common finite element analysis software ANSYS was adopted as the running environment. Member cross section areas of the lattice grid structure were taken as the discrete design variables. The total weight was considered as the objective function. The restrain conditions such as strength, rigidity, stability and cross section dimensions were considered. The one-dimensional search method and the modified stress ratio method were selected as the optimization method. Optimization of the lattice grid structure was conducted. The calculated results show that the optimal method has easy principle and big convergence rate. It can reduce the cost of a project on the base of guaranteeing safety, and can get a better optimal result.