大跨张弦桁架结构尺寸优化设计研究

On Sizing Optimization Design of Long Span Trussed Beam String Structures

以结构重量为优化目标函数,以杆件截面为设计变量,对大跨张弦桁架结构进行尺寸优化设计研究,考虑了杆件长细比、强度和稳定以及结构刚度等约束条件.杆件截面设计变量采用现行规格离散值,利用直接搜索法进行优化搜索.研究表明,大跨张弦桁架结构设计是由结构刚度条件控制的,直接搜索法与离散设计变量联合使用提高了优化搜索速度.

Sizing optimization design of long span trussed beam string structure had been studied, using the structure weight as the optimization objective function and the member section as the design variable, taking into consideration for these constraints of member slenderness ratio, member strength, member stability and structure stiffness. Member section variably took the discrete value from the standards of steel tube and steel wire cable, the direct search technique was used for the optimization search. The study results have shown that the design of long span trussed beam string is controlled by the constraint of structure stiffness, and combination of the direct search method and the discrete design variable improves the optimization search velocity