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为研究列车荷载作用下桥梁的动力响应,本文以德龙烟铁路中一孔64m钢桁架桥为研究对象,采用模型实验和软件模拟的方法分别分析研究。根据相似原理进行结构模型设计,测出模型列车以不同速度在模型桥上运行时桥梁指定位置的动态响应,同时采用Midas civil仿真模拟软件,用一种“单点持续激励”的新方法来模拟列车荷载,并将上述两种方法得到的结果进行对比验证。验证结果表明,列车过桥时,桥梁跨中位置处的冲击系数随车速的增加而增大,但在某个车速附近存在异常值,并且车速和冲击系数之间不是严格线性关系。该研究对车桥耦合振动分析有较好的指导意义。
In order to study the dynamic response of the bridge under the train load, this paper takes 64m steel truss bridge of a drone in the Delongyan railway as the research object, and uses the model experiment and the software simulation method respectively to analyze and study. According to the principle of similarity, the model of the structure was designed and the dynamic response of the model bridge at the specified position of the bridge was measured at different speeds. At the same time, Midas Civil simulation software was used to simulate the bridge with a new method of “single point continuous excitation” To simulate the train load, and compare the results obtained by the above two methods. The results show that when the train passes the bridge, the impact coefficient at the midspan of the bridge increases with the increase of the vehicle speed, but there is anomalous value near a certain speed and the relationship between the vehicle speed and the impact coefficient is not strictly linear. This study has a good guiding significance for the analysis of the coupled vibration of vehicle-bridge.