铁路大跨长联连续梁桥的合龙顺序分析

Closure sequence analysis of long span continuous girder bridge of railway

多跨连续梁桥由于跨数多对应较多的合龙顺序,以在建京沈客专潮白河特大桥跨潮白河河道(60+4×106+60) m连续梁为工程背景,采用有限元软件Midas Civil建立有限元模型,分别计算不同合龙顺序对施工阶段中成桥累计位移和成桥内力的影响。研究结果显示,不同合龙顺序对于多跨连续梁桥成桥累计位移的影响显著,对成桥上下缘应力的影响不大。

The multi-span continuous beam bridge corresponds to a large number of closure due to the number of spans.The engineering background of the Chaobaihe river(60+4×106+60)m continuous beam crossing the Chaobaihe river(60+106+60)m in Jianjing Shenke specialty is used.The finite element software Midas Civil establishes a finite element model.The effect of different sequence on the accumulated displacement and internal force of the bridge in the construction stage was calculated.The results show that the influence of different sequence on the cumulative displacement of multi-span continuous girder bridges is significant,and the effect on the stress of the upper and lower edges of the bridge is not significant.