32m双线简支箱梁在对开列车作用下梁体竖向动力响应规律研究  

THE LAW STUDY ON BRIDGE VERTICAL DYNAMIC RESPONSE OF 32 METER TWO-LANE SIMPLY SUPPORTED BOX GIRDER UNDER OFF THE TRAINS

作　　者：蔡超勋[1] 胡所亭[1] 柯在田[1] 牛斌[1] 

机构地区：[1]中国铁道科学研究院铁道建筑研究所,北京100081

出　　处：《钢结构》2013年第6期18-22,共5页Steel Construction

摘　　要：将列车、双线简支箱梁分别简化为二系悬挂多刚体体系和模态函数,推导车桥系统动力方程,建立并验证车桥相互作用模型,对双线简支箱梁在对开列车作用下梁体竖向动力响应规律进行研究。研究表明:对开列车作用下,桥梁动力响应与列车运行速度及入桥距离差密切相关;列车以共同速度对开时,可引起的梁体最大挠度动力系数与单线行车作用下基本一致,但梁体动力响应值约为单线行车引起的梁体动力响应值的2倍。The trains, two lane simply supported box girder are reduced to the secondary suspension systems of many-rigid-bodies and modal function, then the dynamic equation of vehicle bridge system is derived and the vehicle- bridge interaction model is built and tested. The law of vertical dynamic response of two-lane simply supported beam under off the train has been studied. The studies show that that .the bridge dynamic response under two-lane off the train is closely related to operation speed and distance difference of entering into the bridge. The maximum deflection dynarnic factor incurred by two-lane train in the same speed is equal to that under the single train, but which doubled the value of the beam dynamic response.

关 键 词：车桥系统 双线对开 车桥相互作用 动力系数 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]