大跨度多塔斜拉桥边跨落架研究

Research of removing temporary supports of sidespan of multi pylon cable-stayed bridge with long span

嘉绍跨江大桥主航道桥全长2 680 m,北岸边跨70 m支架梁段采用部分落架方式来实现顶推合龙。由于落架对主梁受力产生不利影响,因此需对该部分落架方案进行调整,以减小合龙口两端高差。利用NLABS有限元软件,采用反力调整方案,对调整前后进行对比分析,并用强制位移方案进行校核,得出最终落架控制条件。

The length of main channel bridge of Jiaxing-Shaoxing River-Crossing Bridge is 2 680 m,the segament of sidespan which is70 m in north shore was pushed closure by removing part of temporary supports. Because of the bad effects to the girder by removing the temporary supports,it should be adjusted the project of it,which can reduce the difference of elevation of the closure. Using the finite element software of NLABS,the project of adjusting the force of supports was adopted. The final dominating condition was obtained by analyzing the results of the former and the latter,and results were checked by using the project of forcing displacement.