椭圆形弦支穹顶结构的预应力确定方法研究  

Method for determining the prestress of elliptical suspendome structures

作　　者：石开荣[1] 郭正兴[2] 罗斌[2] 

机构地区：[1]华南理工大学业热带建筑科学国家重点实验室,广东广州510641 [2]东南大学,江苏南京210096

出　　处：《土木工程学报》2010年第9期88-99,共12页China Civil Engineering Journal

基　　金：江苏省自然科学基金(BK2006104);江苏省建筑业科研计划项目(JG2007-08);华南理工大学自然科学青年基金(x2tjE5090670)

摘　　要：评述弦支穹顶结构预应力确定方法的研究现状,分析弦支穹顶结构的预应力特点和预应力确定的两个层次。着重以椭圆形弦支穹顶为研究对象,对比椭圆形弦支穹顶和圆形弦支穹顶的结构特点。在此基础上,根据自平衡性和按序逐圈分析的基本思想,提出预应力确定的新方法——自平衡逐圈确定法,给出具体的计算控制参数和计算步骤,推导系统的求解策略,并提出"预张力-水平径向位移"迭代法。为进一步提高本方法应用的普适性和便利性,编制相应的交互式计算程序。最后,结合典型算例验证自平衡逐圈确定法的合理性。结果表明:该方法概念明确、应用方便,既适用于椭圆形弦支穹顶,也适用于圆形弦支穹顶;所确定的预应力数值合理可行,能显著改善整体结构的受力性能;选定的计算控制参数较为合适,所提出的"预张力-水平径向位移"迭代法亦行之有效。The status of studies for determining the prestress of suspendome structures is reviewed.The prestress characteristics of suspendome structures are summarized,and two levels of prestress-determination are discussed.Taking the elliptical suspendomes as the main analytical object,different structural characteristics are compared between elliptical suspendomes and round ones.According to the basic ideas of self-balanced performance and sequential analysis ring-by-ring,a new prestress-determination method is put forward,and named as ＇Self-balanced Prestress-determining Ring-by-ring Method＇.The detailed calculation parameters and procedures are introduced.The systematic solution strategies are also deduced.Moreover,an iterative method named ＇Prestress-Horizontal Radial Displacement＇ is proposed.The corresponding interactive computer program is developed in order to improve the applicability and convenience of the method.The method is demonstrated to be rational and effective through typical calculation studies.

关 键 词：椭圆形弦支穹顶 预应力 自平衡 索杆体系 拉索索力 

分 类 号：TU394[建筑科学—结构工程]