三主桁三索面斜拉桥索力横向分配计算简化  

Simplification of Transverse Distribution Calculation for Cable-stayed Bridge with 3 Main Trusses and 3 Cable Planes

作　　者：易炳疆[1] 

机构地区：[1]招商局重庆交通科研设计院有限公司,重庆400060

出　　处：《公路交通科技》2015年第4期95-101,共7页Journal of Highway and Transportation Research and Development

基　　金：国家自然科学基金项目(50808150);西南交通大学优秀博士论文培育项目;清华大学土木工程安全与耐久教育部重点实验室开放基金项目

摘　　要：利用势能极小值原理推导简化的三主桁三索面结构在对称荷载作用下的索力表达式,将其计算结果与有限元计算结果进行对比,阐述其横向受力原理,总结三主桁三索面斜拉桥在对称荷载作用下索力的横向分配规律。分析结果表明,三主桁三索面斜拉桥边索、中索索力不是简单的3倍或者2倍左右的关系,其差异随拉索刚度、主梁横向联接体系刚度、节点刚度等因素变化。The stay-cable＇s tension expression of a simplified structure of cable-stayed bridge with 3 main trusses and 3 cable planes under symmetrical loads is derived based on the principle of minimum potential energy. Its calculation result is compared with those from FEM to analyse its transverse mechanical principle. The transverse distribution pattern of stay-cable tensions of the bridge under symmetrical loads is summarized. The result shows that the tensions of side stay-cables is not ordinary 2 or 3 times as large as that of the tensions of middle cables, the difference between them changes with several factors, such as stiffnesses of stay cables, transverse connecting system of main girder, joints and so on.

关 键 词：桥梁工程 横向分配简化 势能极小值原理 三主桁三索面斜拉桥 弹性支承 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]