摘要
合龙顺序是大跨径连续梁桥成桥状态的主要影响因素。为研究边中跨比大于常规的连续梁取得最优成桥状态时的合龙方案,采用有限元方法建立了连续梁桥的杆系分析模型,以宜万铁路叶溪河大桥为例,对边主跨比0.648的主跨108 m的3跨连续梁的3种合龙方案进行分析,以应力和位移变化幅度最小为原则,确定出该类跨径比的连续梁采用跨中压重的先中跨合龙、后边跨合龙的合龙方案,有助于实现内力平衡和施工控制。
The sequence of final closure of continuous girder bridge with long-span is a main influencing factor on finished-bridge state.To investigate the closure scheme which should accord with the best finished-bridge state of continuous girder under a ratio of side span to main span bigger than the normal,this article takes Yexihe Bridge of Yichang-Wanxian Railway as an example and establishes the rods-system model of continuous girder bridge by finite element method.Further,the article compares and analyzes respectively three closure-sequence schemes of continuous girder with three spans in which the main span is 108m long and the ratio of side span to main span is 0.648.Finally,following the principle of minimum variation of stresses and displacements,aiming at the continuous girder with this kind of span radio,the article puts forward the optimal closure-sequence scheme,that is: with the weights in span center,medium span's closure first,then the side span's closure.This optimal closure scheme is helpful to both internal-force equilibrium and construction controlling.
出处
《铁道标准设计》
北大核心
2012年第7期55-59,共5页
Railway Standard Design
关键词
铁路桥
连续梁
合龙
优化
设计
railway bridge
continuous girder
closure
optimization
design
