高墩大跨铁路桥梁动力特性分析

近年来,随着我国铁路桥梁的迅速发展,桥梁的跨度越来越大,桥墩越来越高,体系越来越柔。高桥墩体自重大、柔度大、阻尼小。本文以某大跨高墩连续刚构桥为计算模型,应用通用软件Midas/Civil建立了三维动力有限元模型,对该桥进行动力特性分析,得出该桥的前十阶振型。并就加弹性阻尼器对结构的动力影响进行分析,得出加弹性阻尼器能够改变结构的动力性能。

Analysis on dynamic performance of large-span railway bridge with high piers

In recent years,with the rapid development of China’s railway bridge,the bridge span is getting larger,the piers are getting higher,and the system is getting softer because of the significant body,flexibility and small damping of high bridge pier.Taking a large span-high pier continuous rigid frame bridge as the calculation model,this paper established three-dimensional dynamic finite element model by the universal software named Midas/Civil,analyzed the dynamic characteristics of the bridge,drew the first ten steps of vibration modes of the bridge,and studied the dynamic impact on the structure with a elastic damper,which concluded that the structure dynamic properties can be changed with a elastic damper.