考虑列车-轨道-桥梁/声屏障相互作用的高速铁路半封闭式声屏障动力响应分析

为分析列车通过时桥上半封闭式声屏障的动力响应,采用Midas建立了桥梁和声屏障的有限元模型,分析结构的自振特性。基于车辆-轨道-桥梁动态相互作用原理,建立列车-轨道-桥梁/声屏障动态相互作用模型,对列车过桥时的安全性与舒适性进行数值计算,研究半封闭式声屏障的动力响应特点。结果表明:在桥上设置半封闭式声屏障后,桥梁和声屏障整体结构的刚度有所变化;列车以不大于220 km/h的速度过桥时,车辆的安全性指标均合格,车辆的平稳性指标为优秀,桥梁的动力响应指标满足规范要求;桥梁与声屏障连接处的边界条件对声屏障动力响应的影响显著。

Dynamic Responses of Semi-closed Noise Barriers for High-speed Railway Based on Train-track-bridge Interactions

In order to analyze the dynamic responses of semi-closed noise barriers on the bridge when a train is passing through,a finite element model of noise barriers on bridges is built with MIDAS and the natural vibration characteristics of structures are analyzed. Based on train-track-bridge dynamic interaction mechanism,a fundamental model is established to conduct numerical calculation of the running safety and the ride comfort when a train is passing through a bridge and study the dynamic responses of noise barriers. The results show that the stiffness of entire structures of the bridge and noise barriers is subject to change after the semi-closed noise barriers are installed on the bridge; the running safety indices are qualified and the ride comfort indices are excellent,and the dynamic responses of the bridge all meet the requirements of relevant regulations if the running speed is not over 220 km / h. The boundary conditions between the bridge and barriers have obvious influence on the dynamic responses of noise barriers.