摘要
采用整体可行预应力概念对索穹顶结构进行预应力优化、截面优化和形状优化设计。预应力优化采用一维搜索法,截面优化采用齿行法,形状优化采用模式搜索法。算例分析表明,对于预应力优化,当由索松弛控制时,预应力水平系数随初始截面面积的增大而增大;当由挠度控制时,预应力水平系数随截面的增大而减小,使结构在荷载作用下满足约束条件而使预应力水平系数最小;截面优化使构件达到满应力设计状态;形状优化通过改变节点位置使结构拥有承受荷载的最轻的结构重量。
The concept of the integrity feasible prestressing is adopted and three different optimal design are studied on the cable-dome structures, which include prestress optimal design, section optimal design and shape optimal design. One dimension search method is used for prestress optimal design, the section optimal design adopts tooth method and the shape optimal design adopts modal search method. The numerical optimal design results indicated that the prestress level rises with the increase of the section area when the restriction condition is controlled by the slack of the cable and falls with the increase of the section area when it is controlled by the max displacement; section optimal design makes every element reach full stress state; shape optimal design reduces the weight of the structure by change the coordinates of the node.
出处
《科技通报》
2006年第1期84-89,共6页
Bulletin of Science and Technology
基金
国家自然科学基金资助项目(批准号:50278086)
关键词
索穹顶结构
整体可行预应力
预应力优化
截面优化
形状优化
cable domes
integrity feasible prestress
prestress optimal design
section optimal design
shape optimal design
