李立峰　周延

摘要：为了研究大跨径波形钢腹板组合箱梁桥的剪力滞效应，结合1座采用悬臂施工的大跨径波形钢腹板箱梁桥，分别建立平面杆系有限元模型和空间实体有限元模型，模拟施工过程，选取3个关键截面，研究了波形钢腹板组合箱梁桥在不同施工阶段的剪力滞效应分布规律。结果表明：大跨径波形钢腹板组合箱梁桥的剪力滞效应随着施工阶段的推移是一个动态变化过程，在悬臂施工阶段，剪力滞效应变化较快，在施工阶段后期，剪力滞效应变化缓慢；最大剪力滞效应发生在最大悬臂状态时的端部截面。

关键词：桥梁工程；剪力滞效应；大跨径波形钢腹板组合箱梁桥；施工阶段

中图分类号：TU311文献标志码：A

Abstract： In order to study the shear lag effect of large span composite box girder bridge with corrugated steel webs， a large span composite box girder bridge with corrugated steel webs using cantilever construction was adopted， and the plane frame model and finite element model were established respectively. The construction processes were simulated and three key sections were selected. The distribution rules of shear lag effect of large span composite box girder bridge with corrugated steel webs at different stages of construction were studied. The results show that the shear lag effect of large span box girder bridge with corrugated steel webs is a dynamic process with the construction stage. The shear lag effect changes rapidly during cantilever construction stage， and changes slowly at the late stage of construction. The maximum shear lag effect occurs on the end section at the maximum cantilever state.

Key words： bridge engineering； shear lag effect； large span composite box girder bridge with corrugated steel web； construction process

0引言

波形钢腹板组合箱梁是20世纪80年代出现的一种新型桥梁，采用波纹钢腹板代替传统的混凝土腹板，结构自重大幅减轻，腹板抗剪屈曲强度提高，使结构具有受力明确、截面效率高、桥型美观等优点，同时彻底解决了混凝土梁桥腹板开裂问题，预应力效率也大幅提高。近年来，该桥型在中国开始大力推广，已建成多座，并且跨径在逐步增大，较有代表性的有山东鄄城黄河大桥、新密溱水桥、桃花峪跨大堤桥、深圳南头立交桥等[1]。各国对波形钢腹板组合箱梁的研究较多[2]，中国很多科研单位对这种结构从模型试验、有限元分析和工程实践等多方面也进行了很多研究，得到一些重要结论[27]。

近年来，中国大跨径波形钢腹板组合箱梁桥的建设开始逐渐增多，但是对于该桥型的研究极少。……