摘要
针对悬索桥施工中塔顶主索鞍的顶推问题,以宜昌长江公路大桥为例,采用三维的实体退化虚拟层合单元建立起全桥的三维有限元模型,对主梁吊装阶段的悬索桥桥塔应力进行了分析,并对索鞍顶推、索鞍自由滑移、索鞍固结这3种假想情况下的桥塔应力计算结果进行了对比,提出了塔顶主索鞍顶推的小步快跑原则,即适当增加顶推次数,减小每次顶推的顶推量.根据小步快跑原则制订的顶推方案与实际施工顶推方案及另一种假想的顶推方案的对比计算结果表明,小步快跑顶推方案可使施工过程中的桥塔应力更加逼近理想受力状态,有利于增加桥塔的施工安全裕度及全桥结构的安全.
Aimed at saddle pushing scheme in suspension bridge construction, took the Yichang Changjiang Highway Bridge taken as an example, and based on a 3D finite element model of suspension bridge, analysis of tower stress during beam constructing period was constructed. Tower stresses in three different saddle pushing schemes （saddle pushing, saddle free-slipping, saddle fixed） were compared. The frequent short steps saddle pushing principle presented, means that saddle pushing was frequent and that the space of each pushing was short. In contrast the calculating result showed that frequent short steps saddle pushing scheme made tower stress more close to perfect state and that it is beneficial to safety of the structure.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2007年第1期134-138,共5页
Journal of Zhejiang University：Engineering Science
关键词
悬索桥
应力
索鞍顶推
小步快跑
suspension bridge
stress
saddle pushing
frequent short steps
