32m重载铁路T梁动力性能试验研究

Experimental Study of the Dynamic Performance of the 32-m T-Beam for Heavy-Load Railways

重载铁路运输的快速发展,显著提高了铁路运营能力和经济效益。但是随之带来的是对铁路桥梁冲击振动加剧、梁体开裂等一系列不利影响,严重危及铁路行车安全。以重载运输条件下32m铁路T梁为研究对象,通过有限元仿真分析结合现场动载试验,研究不同轴重列车作用下对桥梁动力性能的影响,最后得出桥梁横向加速度值与列车轴重有关,验证了本文提出的有限元仿真计算与荷载试验相结合的方法是可行且有效的。

The rapid development of heavy-load railways remarkably improves the operational capability and economic benefits of railways. However,some disadvantages also follow it, such as the exacerbated impact and vibration of railway bridges, the cracking of beam bodies,etc. ,which seriously jeopardize the safety of the railway. With the 32-m T-beam of heavy-load rail- ways as the object of our study, the influence of different axle-load trains on the dynamic performance of railway bridges is sim- ulated and analyzed by the finite element method, with site dynamic load tests performed as well. Finally, it is found that the val- ue of the lateral acceleration of the bridge is related to the axle load of the train. It is proved that the method of the finite ele- ment simulation analysis combined with load tests presented in this paper is feasible and effective.