顶推施工中导梁的合理配置

导梁的长度、刚度及重量在顶推施工阶段对顶推主梁的内力有着重要的影响，其合理配置是全桥顺利顶推的关键。从顶推施工阶段主梁的内力分析入手，并结合某大桥利用有限元程序进行了导梁结构参数对主梁内力影响的敏感性分析，为顶推施工中导梁的配置提供参考。

Reasonable Arrangement of Launching Nose in Incremental Launching Construction

The length, rigidity and weight of a launching nose have significant influences on the internal forces of incrementally-launched main girder at construction stage. The reasonable arrangement of the launching nose will be critical to the smooth proceeding of incremental launching construction of the whole bridge. In this paper, from the point of analysis of the internal forces of the main girder at the incremental launching construction stage, and also with reference to an actual bridge project, the finite element program is used to conduct sensitivity analysis of the influences from structural parameters of the launching nose on the internal forces of the girder, and the results of the analysis herewith can provide reference to the arrangement of other launching noses for incremental launching construction.