Rail irregularity presents a major threat to the high-speed train (HST) safety on a high-speed rail (HSR) bridge. Lateral bridge deformation has a significant impact on geometric parameters of the rail. In this paper, the influence of lateral bridge deformation on the train operation on the HSR bridge is investigated. Variational calculus is employed to establish the analytical mapping between the lateral bridge and rail deformation. By superimposing the mapped rail deformation and initial random rail irregularity, the composed rail unevenness under lateral bridge deformation is obtained. Thereafter, by adopting the dynamical model of the train-track-bridge coupling system (TTBCS), the dynamic behaviour of the train moving across the HSR track-bridge system is analysed. Based on safety and comfortability control indicators of the HST operation, effects of different types of lateral bridge deformations with various amplitudes on the train’s operation performances are investigated. The results indicate that the bilateral girder’s mutual translation has the most significant impact on the train’s operation. When the HST is moving with the velocity of 350 km/h, lateral bridge deformation amplitude thresholds are suggested as 17.43 and 8.12 mm to ensure the safety and comfortability of the HST operation, respectively. The obtained results can provide beneficial pointers for HSR bridge design.

铁路不规则性对高速铁路 (HSR) 桥梁上的高速列车 (HST) 安全构成重大威胁。横向桥梁变形对钢轨的几何参数有显着影响。本文研究了横向桥梁变形对高铁桥梁列车运行的影响。变分法用于建立横向桥梁和钢轨变形之间的解析映射。通过叠加映射的钢轨变形和初始随机钢轨不平整度，得到横向桥梁变形下的合成钢轨不平整度。此后，采用列车-轨道-桥梁耦合系统（TTBCS）动力学模型，分析了列车穿越高铁轨道-桥梁系统的动态行为。基于高铁运行的安全性和舒适性控制指标，研究了不同幅值的不同类型侧桥变形对列车运行性能的影响。结果表明，双边梁相互平移对列车运行的影响最为显着。高铁以350公里/小时的速度行驶时，建议横向桥梁变形幅度阈值分别为17.43和8.12毫米，以确保高铁运行的安全性和舒适性。所得结果可为高铁桥梁设计提供有益的指导。高铁以350公里/小时的速度行驶时，建议横向桥梁变形幅度阈值分别为17.43和8.12毫米，以确保高铁运行的安全性和舒适性。所得结果可为高铁桥梁设计提供有益的指导。高铁以350公里/小时的速度行驶时，建议横向桥梁变形幅度阈值分别为17.43和8.12毫米，以确保高铁运行的安全性和舒适性。所得结果可为高铁桥梁设计提供有益的指导。