三跨连续加劲梁悬索桥无索区梁段线形调整方法研究

The curve adjustment method of girder segments without hangers for suspension bridge with three-span continuous stiffening girder

三跨连续加劲梁悬索桥在桥塔处梁段刚接及体系转换时如何保证无索区的线形平顺过渡、顺利进行体系转换、确保成桥线形与内力一致是一个难度较高的技术课题。本文讨论了国内外无索区梁段进行体系转换的方法,并以一座超千米的三跨连续钢箱梁悬索桥为例,实现其无索区加劲梁体系转换、线形调整和施工控制。

It is a difficult technical problem to make sure that the curve of girder segments without han- gers is transitioned smoothly and the system transformation is successful and that the internal force keeps consis- tent with the girder curve when connecting the segments near the tower rigidly and transferring structure system for the suspension bridge with three-span continuous stiffening girder. The system transformation methods at home and abroad of girder segments without hangers are discussed in this paper, and by taking a suspension bridge of over 1 000 m with three-span continuous stiffening girder as an example, the system transformation, curve adjustment and construction control of the girder segments without hangers are realized.