Study on the Effects of Bearing Stiffness Reduction on the Acceleration Response of Canopy

为探究支座刚度折减对铁路站房雨棚车致加速度响应的影响规律，本文以某典型铁路站房为研究对象，建立了考虑支座刚度折减的列车–铁路站房耦合动力响应分析方法，并基于实测数据验证，在此基础上探究了支座刚度折减对雨棚车致加速度响应的影响规律。研究表明：本文提出的列车–铁路站房耦合动力响应分析方法可以有效模拟高速列车过站时引起的加速度响应，分析结果与实测结果的最大误差仅为10.91%；支座刚度折减导致雨棚各测点加速度响应增大，其中跨中加速度响应大于端部，且第1跨各测点的加速度响应大于第2跨。To investigate the influence of bearing stiffness reduction on the acceleration response of canopy, this thesis takes a typical railway station as the research object and establishes a coupled train-station dynamic response analysis method that considers bearing stiffness reduction. Field measurement data are used for validation, and on this basis, the influence and mechanism of bearing stiffness reduction on the acceleration responses of the canopy are further examined. The results indicate that the proposed coupled train–station dynamic response analysis method can effectively simulate the acceleration response induced by high-speed trains passing through the station, with a maximum error of only 10.91% compared with the measured results. Furthermore, the bearing stiffness reduction leads to an increased acceleration response at various measurement points on the canopy, with the mid-span acceleration response being greater than that at the ends, and the acceleration response at all measurement points in the first span exceeding those in the second span.