超大跨径三塔悬索桥加劲梁吊装方案  

Erection scheme for stiffening girder of super long span triple-tower suspension bridge

作　　者：贾丽君[1] 丛霄[1] 林赞笔 孙斌[1] 

机构地区：[1]同济大学土木工程学院,上海200092

出　　处：《沈阳工业大学学报》2017年第6期702-709,共8页Journal of Shenyang University of Technology

基　　金：国家重点基础研究发展计划项目(2013CB036303)

摘　　要：为了寻找超大跨径三塔悬索桥建设中更为有利的加劲梁吊装方案,以主跨2 000 m三塔悬索桥为对象,运用参数分析结合有限元数值模拟的方法研究了主、边跨加劲梁不同吊装顺序对边塔鞍座偏移量、主缆线型、合龙位置、合龙段施工方法以及吊装过程中结构动力响应的影响.结果表明,超大跨径三塔悬索桥主跨加劲梁宜从跨中向索塔方向吊装,边跨加劲梁宜从锚碇向边塔方向吊装,该方案下主缆水平倾角小,扭转基频较大,颤振稳定性更好,且采用预偏合龙方法时所需要的牵引力小,因而按该方案吊装对桥梁建设更为有利.In order to find a more favorable erection scheme for stiffening girder of triple-tower suspension bridge during construction,a triple-tower suspension bridge with the main span of 2 000 m was taken as the object,and the influence of different erection sequences of both mid-span and side-span stiffening girders on the saddle offset of side-tower,main cable type,closure position,construction method for closure segment,and dynamic response of structure in the erection process was studied with the combination method of parameter analysis and finite element numerical simulation. The results indicate that it is preferable to erect girders from the mid-span to the tower for the main span stiffening girder of super long span triple-tower suspension bridge,and it is suitable to erect girders from the anchor to the side tower for the side-span stiffening girder. The proposed scheme has small horizontal dip angle of main cable,large fundamental torsional frequency,better flutter stability and small traction force with employing the pre-closure method.Therefore,the proposed scheme is more beneficial to bridge construction.

关 键 词：超大跨径三塔悬索桥 加劲梁吊装顺序 边塔鞍座偏移量 主缆线型 扭转基频 颤振稳定性 结构静动力性能 数值方法 

分 类 号：TU997[建筑科学—市政工程]