Kiewitt型索穹顶结构的找力分析方法研究  

Investigation into Method of Force-Finding Analysis for Kiewitt Cable Domes

作　　者：姜正荣[1,2] 张子健 石开荣[1,2] 古学金 罗斌[3] JIANG Zhengrong;ZHANG Zijian;SHI Kairong;GU Xuejin;LUO Bin(School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China;State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China;School of Civil Engineering,Southeast University,Nanjing 210096,Jiangsu,China)

机构地区：[1]华南理工大学土木与交通学院,广东广州510640 [2]华南理工大学亚热带建筑科学国家重点实验室,广东广州510640 [3]东南大学土木工程学院,江苏南京210096

出　　处：《华南理工大学学报（自然科学版）》2019年第5期103-109,122,共8页Journal of South China University of Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(11673039);华南理工大学亚热带建筑科学国家重点实验室开放课题(2019ZB27)~~

摘　　要：以具有多个整体自应力模态的Kiewitt型索穹顶结构为研究对象,对单整体自应力模态索穹顶结构找力分析的比值更新法进行改进,提出了适用于Kiewitt型索穹顶结构的找力分析新方法,并以算例进行了验证.通过指定关键组件,分别对其施加预应力进行迭代计算,应用基于最小二乘的模态误差分析方法,将计算结果与奇异值分解法所得结果进行对比,发现:改进的比值更新法精度高,相比奇异值分解法,其得出的结果均为整体可行的自应力模态,即索受拉、杆受压,力学意义明确,为该结构的预应力确定提供了新的思路和解决方法.By taking the Kiewitt cable domes which contain multiple overall self-stress modes as the research objects,this paper deals with the improvement of ratio-updating method for force-finding analysis of cable domes with single overall self-stress mode and proposes a new approach to force-finding analysis of Kiewitt cable domes,with its applicability being validated by examples later.Moreover,the key members are designated and prestressed to perform an iterative computation,and,by using the mode error analysis method based on the least-squares,a comparison of the results respectively obtained by the proposed method and the singular value decomposition method is carried out.The results show that,as compared with the singular value decomposition method,the proposed improved ratio-updating method possesses high accuracy and helps to obtain overall feasible self-stress modes with clear meaning in the mechanical concept of cables in tension and struts in compression,thus providing a new idea and solution for the prestress determination of cable domes.

关 键 词：Kiewitt型索穹顶结构 找力分析 整体可行自应力模态 比值更新法 

分 类 号：TU394[建筑科学—结构工程]