大跨连续梁桥上改善梁轨相互作用力的方法探索

Improvement of the Interaction between Deck and Rail on Big Span Continuous Beam Bridge

随着大跨连续梁桥的出现,桥上无缝线路超应力问题越来越严重。德国和日本对于改善梁轨相互作用都有各自的方法,其中RSB传力杆、纵向连接器与小阻力扣件等是比较典型的方案。将这些构件引用到大跨连续梁中,通过建立ANSYS模型,模拟这些构件在大跨连续桥梁上的使用,分析与比较了各自的优缺点。结果表明:设置纵向连接器对于减小梁轨相互作用的效果很显著;使用小阻力扣件能减小附加力,但在一定程度上会增大梁轨相对位移;设置RSB传力杆只能部分改善梁轨相互作用,在断轨力的作用下,钢轨断缝值很容易超出界限,不利于行车安全。

In recent years, the super stress of the seamless bridge track is becoming more and more serious with the construction of big span continuous beam bridge. In order to solve the problem, Germany and Japan have adopted some typical schemes like RSB dowel bar, longitudinal linker and the small resistance fastening, which have been widely ap- plied to the big span continuous beam bridge. In this paper, a model to simulate the behavior of these structural mem- bers on big span continuous beam bridge is established by u- sing the software ANSYS, so as to analyze and compare the advantages and disadvantages of those solutions. The results indicate that the effect of setting the longitudinal linker is significant to reduce the interaction between the deck and rail, the use of small resistance can reduce additional force, but it will increase the relative displacement between the deck and rail to some extent. The setting of the RSB dowel bar can partly improve the interaction between the deck and rail, because under the braking force, because the bro- ken seam value of the rail can easily go beyond the bounda- ries and threats the operational safety.