（西安建筑科技大学土木工程学院 710055）
【提要】 在张弦桁架形态分析的基础上，采用多阶段形态优化设计方法，建立了优化设计步骤及多个优化模型，对比分析了各模型的位形、杆件轴向应力、弯矩、拉索预应力、用钢量等经济技术指标，根据刚度设计要求得到了最合理模型，该模型可为设计经济合理的张弦桁架提供参考。
【关键词】 张弦桁架 形态 形态优化 设计方法 稳定
Shapestate Optimization Design of Largespan Truss String Structure/Xiong Wei,Wu Minzhe(College of Civil Engineering,Xi'an Univ. of Arch. & Tech.,Xi'an 710055,China)
Abstract:On the basis of shapestate analysis of truss string structure,design steps and some optimization model based on dividedphase shapestate optimization are presented. The shape,axial stress,moment,cable prestress,sum of steel of the model are compared and investigated,and a best model is got according to the demend structure stiffness,which may be a reference for project design.
Keywords:truss string structure;   shapestate;   shapestate optimization; design method; stability