分幅斜拉桥斜拉索无应力长度的简化计算方法  

Simplified Calculation Method of Unstressed Length of Cable-Stayed Bridge with Separate Twin-Decks

作　　者：赵雷[1] 贾少敏[1] 顾乡[1] 

机构地区：[1]西南交通大学土木工程学院,四川成都610031

出　　处：《重庆交通大学学报（自然科学版）》2014年第6期5-8,88,共5页Journal of Chongqing Jiaotong University(Natural Science)

基　　金：交通运输部科技项目(2010 353 333 130)

摘　　要：多塔、分幅、内外侧索面不对称钢斜拉桥属典型空间结构,其斜拉索数量较多,直接确定每根斜拉索无应力长度非常困难。以六塔、双幅、空间四索面的嘉绍大桥为研究对象,首先基于刚度等效原则,将主桥空间结构等效简化为平面结构,确定其等效合理成桥索力;其次提出索力分配原则,将所确定的平面成桥索力转化为空间索力;最后利用悬链线方程求出每根斜拉索的无应力长度。经实践验证,该方法可快速、准确地确定各斜拉索的无应力长度。Steel cable-stayed bridge with multi-tower,separate twin-decks and asymmetrical cable plane is a typical spatial structure. The number of cable is large,so it ＇s difficult to determine unstressed length of each cable directly. Taken Jiashao Bridge with six-towers,double decks and four space cable planes as the research subject,firstly based on the principle of equivalent stiffness,the main bridge structure was simplified as a planar structure,to determine its reasonable equivalent cable force; secondly a principle of distribution cable force was put forward,and the flat equivalent cable force was transformed into space cable force; finally unstessed length of each cable was calculated based on catenary equation. The method can quickly and accurately determine unstressed length of each cable.

关 键 词：桥梁工程 多塔、分幅、不对称索面斜拉桥 无应力索长 成品索长 等效刚度 悬链线方程 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]