摘要
在网壳结构下部用预应力钢索施加与外荷载作用下方向相反的力，对改善网壳结构的受力状态、提高结构承载能力、增强结构的整体刚复、节约钢材、降低造阶等有利。本文进行了预应力短程线型钢网壳计算理论的研究，给出了预应力索单元的刚度矩阵，编制了空间杆系有限元理论的预应力网壳五阶段全过程设计的静力分析程序，结合己完工的攀枝花体育馆屋盖网壳结构的工程实例．探讨了短程线型钢网壳在自重、拉索预应力和设计荷载作用下结构的内力及位移的分布规律、索力的优选、预应力损失以及支座约束变化对网壳内力和位移的影响，还对比了网壳在不同预应力张拉顺序及有无预应力时的计算结果。
Abstract To improve the static characteristic,teristic,the bearing capacity and thextiffness of the latticed shell structures,and also to save the steel,naterhl and thus to reduce the construction cost of it,it is profitable to apply aforce,the direction of wyhlch is opposite form the load action,upon the bottom of shell structure by means of the prestressed steel cables,In this papeer the anlysis theory of the prestressed geode;ic latticed shell is studied,thestiffness matrix of prestressed cable element is presented.and,a static analysis. program of prestressed latticedshell with five-stage design is edited.Taking the panzhihud,Stadium roof which has just been constructed as anexample,the distributions of internal forec and displacement under the action of the dt3ad weight.the prestressof the cnble:and the design loads are obtained. The influences of the optimlzation of cable prestress,the prestressIosses and the variation of the support constraint on internal force and displacement are also discussed.In addition,the calculaition results of the latticed shell under different tenshn ordernnd at prestress or nonprestressCase are compared。
出处
《空间结构》
CSCD
1995年第1期38-47,共10页
Spatial Structures
