斜拉索分析统一理论及其应用_梁鹏.pdfVIP

第23 卷　第1 期 建筑科学与工程学报 Vol. 23　No. 1 2006 年3 月 Journal of A rchitecture and Civil Engineering M ar. 2006 :1673-2049(2006)0-1 006-10 梁　鹏,徐　岳,刘永健 ( , 　710064) :通过对现有各种斜拉索分 理论进行分 , 基于悬链线索单元理论,将斜拉桥单索问题分成 两类,提出了斜拉索分 的统 一理论。该理论可以精确、统 一地求解斜拉桥计算中几乎所有的单索 静力问题, 可方便地将悬链线索单元引入斜拉桥施工阶段和使用阶段的分 中。根据悬链线索单 元理论和等效弹模法, 对比分 了不同长度、不同应力水平的斜拉索的各种特性。计算结果表明: 水平长度超过400 m 的斜拉索的非线性将急剧增大, 采用等效模量法模拟斜拉索将引起较大的误 差;有些误差即使增加计算的荷载步 个数也无法减小。超大跨度斜拉桥施工阶段分 中建议采用 高精度的悬链线索单元模拟斜拉索。 :桥梁工程;斜拉索分 统一理论;悬链线索单元;等效弹性模量;斜拉桥 :U44 . 41　　　:A Unified Analysis Theory of Cable Stay and Its Applications LIANG Peng, XU Yue, LIU Yong-jian (Key Laboratory for Bridge and Tunnel of Shaanxi Province, Chang an University, Xian 710064, Shaanxi, China) Abstract:By analyzing all kinds of analysis theory of cable stays, the problems about cable stays were divided into tw o kinds, and based on the theory of catenary cable element, a unified analysis theory of cable stays w as put forw ard. It could solve almost all static problems about single cable stay accurately and consistently . A uthors made it easy to apply the catenary element to analysis of cable-stayed bridges. Based on the theory of catenary cable element and equivalent modulus of elasticity, cable characteristics w hich had different length and different stress w ere studied comparatively . It w as concluded that nonlinearity of cable stays became more significant dramatically w hen its length exceeded 400 m . The error of the method of equivalent modulus of elasticity may be very large. Some kinds of errors can not be decreased even increase the number of load steps. It is recommended to use catenary cable element in the analysis of super long span cable-stayed bridges. Key words:bridg