近年来,时有工务段反映管内的桥墩过车时摇晃严重,为了保证行车安全,要求进行技术状态检定或大修加固。评定桥墩技术状态的好坏,除了作必要的理论检算外,在动荷载作用下,测定其动力特性尤为重要。一、用振动特性判断桥墩病害的理论分析铁路桥梁在荷载作用下的振动,为相互耦联的空间随机振动。就各桥墩自身的振动特性而言,转动分量较小,垂直振动和纵向水平振动受到梁和相邻墩的耦联影响较强, In recent years, there are occasions when the work section reflects that the pier in the pipe is seriously shaken when passing over the car. In order to ensure driving safety, the technical status check or overhaul reinforcement is required. Evaluation of the technical status of the pier is good or bad, in addition to making the necessary theoretical calculations, the dynamic load under the action of the determination of its dynamic characteristics is particularly important. First, the use of vibration characteristics to determine the disease of the bridge pier Theoretical analysis of the railway bridge under the load vibration, the coupling of random vibration space. In terms of the vibration characteristics of the piers themselves, the components of rotation are small, and the vertical vibration and longitudinal horizontal vibration are strongly influenced by the coupling between the beam and the adjacent piers,