This technical note addresses the overturning risk assessment of high-speed trains over multi-span simply supported bridges under crosswind. A train-bridge coupled system is established to estimate the wheel–rail contact forces from which the overturning risk of train is assessed. The estimation is also compared to that without consideration of bridge vibration. The result shows that the loss of vertical wheel–rail contact force is primarily caused by the crosswind. The influence of track irregularities and bridge vibration on overtuning risk of train is secondary. The bridge deformation can be approximately estimated as static deformation under moving train weight thus a sophisticated dynamic analysis of coupled train and bridge system can be avoided. When the external excitation due to deformation of multi-span bridge has a frequency close to the vertical domain frequency of train system, resonant effect is observed which increases the influence of the bridge deformation on train performance.

本技术说明解决了高速列车在侧风作用下在多跨简支桥上的倾覆风险评估。建立了一个火车-桥梁耦合系统来估计轮轨接触力，从而评估火车的倾覆风险。该估计也与不考虑桥梁振动的估计进行了比较。结果表明，垂直轮轨接触力的损失主要是由侧风引起的。轨道不平顺和桥梁振动对列车超调风险的影响是次要的。桥梁变形可以近似估计为移动列车重量下的静态变形，因此可以避免对耦合列车和桥梁系统进行复杂的动态分析。