格构式抱杆优化设计

用于特高压输电线路的抱杆高度达到40m，自重较大并且成为抱杆设计时必须考虑的参数。抱杆设计时，选用抱杆质量为目标函数，以满足设计容许中心压力为约束条件，对抱杆的主材、斜材和断面尺寸进行综合优化，利用序列二次规划法在Matlab 软件上进行计算。实例计算表明：从计算结果可以直接确定最优的主斜材角钢型号和断面边宽；设计选取主材角钢时，尽量使用较厚的角钢，材料才最省；在满足使用的情况下加大抱杆的断面边宽，对抱杆的质量影响最为明显，抱杆的斜材厚度取约束下限才最省材料。

Optimization Design of Lattice Lifting Poles

Because the height of lifting poles in UHV transmission lines can reach 40 m high and has large weight,these parameters must be considered in lifting pole design.When a lifting pole is being designed,its weight is used as objective function to satisfy allowable center pressure constraint.In this paper,the major members,web members,and their cross-section sizes are optimized in Matlab using sequential quadratic programming(SQP) method.Case studies show that,to main and web members,the type of angled steel and its cross-section width can be directly determined from calculation results;when selecting angled steel for major members,thicker one should be used to save material;when the operating conditions are met,increasing lifting pole edge width will affect lifting pole mass significantly,and to save material as much as possible,the thickness of angled members should choose the lower limit of the constraint.