中文摘要：

对实际工程中常见的拱形桁架，取其整体重量为目标函数，以桁架的拱高、厚度和各杆件的截面特征为设计变量，以杆件应力、稳定性和节点位移为约束条件，依据遗传算法的基本理论进行优化计算，并对计算过程和结果进行了分析．结果表明，利用遗传算法进行拱形桁架的最小重量设计是可行和有效的．

英文摘要：

The optimization of the engineering structure generally means the minimization of the weight of the structure. For the arch truss commonly adopted in practical projects, with the total weight of the structure taken as the objective function, the arch rise, the arch thickness, and the sectional characteristics taken as design variables, and the rod stress, stability and nodal displacement taken as the constraints, the genetic algorithms were employed for its optimal design. The analysis of the calculated result shows that the genetic algorithm is feasible and effective for minimization of the weight of arch tresses.