弦支穹顶结构环索预应力设计方法对比研究  

Comparison of Schemes for Hoop Cable Pre-stress in the Optimization Design of Suspendome Structures

作　　者：刘树堂[1] 黄卫林[1] LIU Shutang;HUANG Weilin(School of Civil Engineering,Guangzhou University,Guangzhou 510006,China)

机构地区：[1]广州大学土木工程学院,广州510006

出　　处：《建筑钢结构进展》2018年第6期87-96,共10页Progress in Steel Building Structures

摘　　要：选取几何法及撑杆控制面积法确定环索预应力比,选取支座径向位移相等准则及网壳顶点竖向位移相等准则确定环索预应力幅值,将它们进行交叉组合构成4个环索预应力设计方案。另外还选取刚性索法及改进刚性索法作为环索预应力设计方案。以2008年北京奥运会羽毛球馆屋盖弦支穹顶结构为背景建立了算例结构模型。以结构重量为目标函数,考虑构件的长细比约束、强度应力约束、稳定应力约束和结构位移约束,考虑12个设计荷载工况。基于上述6个环索预应力设计方案,采用ANSYS编程语言分别编制结构优化设计程序,以确定最优的环索预应力设计方案。研究结果表明:在弦支穹顶结构优化设计中,以撑杆控制面积法确定环索预应力比,以支座径向位移相等准则确定环索预应力幅值,所获得的结构重量最轻同时结构水平与竖向刚度也最大。The ratio of hoop cable pre - stress is determined using geometric method and strut control area method , and the level ofhoopcable pre - stress is identified using two criteria for radial displacement equality at the support and verticaldisplacement equality at the lattice shell peak.The geometric method and the strut control area method are combinedwith two criteria above through crossing to form four schemes for determining hoopcable pre - stress.In addition , therigid hoop cable method and the modified rigid hoopcable method are selected as well to be schemes for determininghoopcable pre - stress.A sample structure is built as the suspendome structure of the badminton gymnasium roof for2008Olympic Games.Structure weight is selected to be optimum function , accounting for these restraints ofslenderness ratio , strength stress , stability stress and displacement , and twelve loading cases.Based on the above sixschemes for hoop cable pre - stress ,six programs are written for suspendome optimization design using ANSYS in orderto find the best scheme.Results show the minimum weight , the maximum horizontal and vertical stiffness of thestructure can be obtained under the scheme combining the strut control area method with the radial displacementequality criteria.

关 键 词：弦支穹顶结构 环索 预应力比 优化设计 支座径向位移 设计准则 

分 类 号：TU393.3[建筑科学—结构工程]