多跨矮塔斜拉桥合拢顺序对主梁内力及线形的影响

Influence of Closure Sequence of Low-pylon Cable-stayed Bridge on Inner Force and Alignment of Main Girder

以江肇高速公路西江特大桥为背景,研究合拢顺序对主梁内力及线形的影响。通过设计两种不同的主梁合拢方案,分别计算其所需的顶推力和相应结构的变形,从顶推的可操作性及线形的可控制性等角度进行比选,得到了该桥较为合理的合拢方案,并在此基础上制定相应的合拢措施。

Taking Xijiang Bridge in Jiangmen – Zhaoqing Expressway as the background, the article studies the influence of closure sequence on the inner force and alignment of main girder. According to the design oftwo different closure schemes of main girder, the article calculates the jacking thrusts of two schemes and the deformation of relative structures, compares and selects the operability of jacking thrusts and the controllability of the alignments, describes the reasonable closure scheme of this bridge, and on this basis formulates the relative closure measures.