多整体自应力模态索穹顶结构优化设计  

Optimal Design of Cable-domes with Multi-overall Selfstress Modes

作　　者：陈联盟[1] 董石麟[2] 袁行飞[2] 叶军[2] 

机构地区：[1]温州大学建筑与土木工程学院,325035 [2]浙江大学空间结构研究中心,杭州310027

出　　处：《建筑结构》2008年第2期35-38,共4页Building Structure

基　　金：国家自然科学基金资助项目(50278086)

摘　　要：基于结构整体可行性和对称性、两次奇异值分解提出了一种求解各种索穹顶结构整体自应力模态的新方法。分析发现,Kiewitt型索穹顶结构具有多个独立的、但没能满足整体可行性要求的整体自应力模态。以初始应变能最小为预应力优化目标和重量最轻为截面优化目标进行了优化设计,获得了合理的初始预应力分布和截面大小。Kiewitt型索穹顶结构算例表明了预应力优化及截面优化模型的有效性和正确性。A new method which can determine the overall selfstress modes of different kinds of cable-strut tensile structures is proposed by using the method of singular value decomposition and considering the symmetry and feasibility of the structure. The Kiewitt dome has multi-independent overall selfstress modes which can＇t satisfy the overall feasible conditions. Taking the minimum initial-strain of the structure as the objective function of the optimal prestress design and the minimum light of the structure as the objective function of the optimal section design, the optimal initial prestress and section areas have been achieved. The results show that the optimal prestress design and optimal section design are reasonable and effective.

关 键 词：索穹顶结构 Kiewitt型索穹顶 整体自应力模态 预应力优化 截面优化 

分 类 号：TU318[建筑科学—结构工程] TU359