A train–rail–bridge (TRB) interaction model of vector mechanics (VM) is developed to predict the derailment of a train traveling
over cable-supported bridges under crosswinds. The aerodynamic coefficients measured from the bridge section-model in wind tunnel testing
is used to simulate the unsteady wind pressure acting on the train-bridge system by buffeting forces in the time domain. A versatile wheel-rail
contact model considering the wheel-rail contact geometry is then formulated to assess the risk of derailment of a running train. The feasibility
and effectiveness of the proposed VM-TRB model are verified by comparison with a conventional finite element procedure. To assess the
running safety of the train, a two-phase plot of derailment factors for each pair of wheelsets is generated. The plots indicate that both wind
velocity and train speed are critical factors that lead the train cars to potential derailment. Nevertheless, the linking railcar couplers play a
holding role in reducing the separation or jumping of the moving wheels from the rail. The case study well demonstrates the capability of the
VM-TRB model in dealing with train derailment.
Relation:
ASCE Journal of Engineering Mechanics 146(12), 04020132
