倒圆角三角形弦支穹顶结构预应力优化.pdfVIP

第 40 卷 第 5 期 建 　筑 　结 　构 2010 年 5 月 倒圆角三角形弦支穹顶结构预应力优化 1 1 1 2 2 2 杨 　波 , 　戴国欣 , 　聂诗东 , 　王立维 , 　杨 　文 , 　杨 　曦 ( 1 重庆大学土木工程学院 ,重庆 400045 ; 2 中国建筑西南设计研究院 ,成都 610081) [摘要] 　通过对一倒圆角三角形弦支穹顶结构 4 种预应力方案的静力分析 , 比较了不同的预应力设置方案下结构 的最大竖向位移 、上部网壳构件的最大轴力和支座径向位移 。在此基础上提出了进一步提高此类结构受力性能指 标的综合优化方案 。分析结果表明:在选择预应力优化方案时为防止结构变形和预应力损失的影响 ,需要对结构进 行形态分析 ;最优的预应力方案是在几何法和刚性索法的基础上得出的 ,预应力方案的选择需要基于结构的各项 性能指标来综合判断 。 [ 关键词] 　倒圆角三角形弦支穹顶 ; 形态分析 ; 张力补偿法 ; 几何法 ; 刚性索法 Prestress optimization of chamfering triangle suspendome structure 1 1 1 2 2 2 Yang Bo , Dai Guoxin , Nie Shidong , Wang Liwei , Yang Wen , Yang Xi ( 1 College of Civil Engineering , Chongqing University , Chongqing 400045 , China ; 2 China Southwest Architectural Design and Research Institute , Chengdu 610081 , China) Abstract :Based on the static analysis of four prestress methods for the same chamfering triangle suspendome structure , the internal force of the member , joint displacement and the support horizontally radial dispalcement were compared. In addition , the compositive prestress optimization , which could increase the loadcapability dramatically , was proposed. The analysis results indicate that in order to prevent the deformation of structure and reduce the influence of prestress loss , it is necessary to conduct the structural shape analysis when selecting the prestress optimization method. The optimization of prestress method is found based on the geometry method and rigid cable method , therefore the selection of prestress method should