辅助钢梁加固重载铁路桥梁的动力响应分析

既有重载铁路混凝土简支双T桥梁已不能满足现在重载运输的要求,故对既有重载铁路桥梁提出一种加固方法——辅助钢梁加固法.采用列车-轨道-桥梁系统的时变动力分析理论,建立列车-轨道-桥梁系统的空间振动分析模型.本文计算了桥梁加固前后的动力响应和加固后不同速度条件下桥梁的动力响应,将计算结果与现场实车试验作了对比.计算及试验结果表明,采用辅助钢梁加固法能同时显著提高混凝土双T梁的横向和竖向刚度.因此该加固方法是合理可行的.

Dynamic Response Analysis of Heavy-haul Railway Bridge Strengthened by Bonding Assisted Steel Beams

The existing heavy-haul railway concrete simply supported double-T-type beam bridges can not meet the requirements of heavy haul transport. So, a strengthening method of bonding assisted steel beams for the existing heavy-haul railway bridges was put forward. Using the theory of train-track-bridge time-varying system, the spatial dynamic analysis model of train-track-bridge system was set up. And based on the existing heavy-haul railway concrete simply supported double-T-type beam bridge and strengthening method, the dynamic response was analyzed, the dynamic response of bridges at different speed reinforcements was calculated. Comparing the real vehicle testing data with the calculation results, it has been shown that the strengthening method of bonding assisted steel beams can improve the lateral and vertical stiffness of the concrete simply supported double-T-type beam bridge. Therefore, the strengthening method is feasible and reasonable.