既有铁路钢桁梁桥动力特性及横向刚度加固研究

Study of Dynamic Characterisuics and Strengthening Lateral Stiffness of Existing Railway Steel Truss Bridge

针对目前铁路列车提速时既有铁路钢桁梁桥中的某些桥梁出现横向刚度不足而导致横向振幅过大的问题,分析了半穿式和下承式钢桁梁桥的受力特点,研究加固该类桥梁横向刚度的最佳方案,通过有限元建模分析计算四座桥梁的动力特性和横向振动,并与实测资料相对比,提出针对该类桥梁合理的加固措施。

With the speed upgrade of railway vehicle, the problem of lateral vibration amplitude exceeding limit, which is caused by inefficiency of lateral stiffness, appears in some steel truss bridges on existing railway. This article analyses the characteristics of bearing forces of a half-trough and a through steel truss bridge to find out the optimum scheme of reinforcing bridges of this type. Modal response and dynamic characteristics of four bridges are analyzed by using finite element software. The result is then compared with the data obtained by surveying on-the-spot. At last reasonable reinforcing measures are put forward for this type of bridge, strengthening .