Running Safety of a Passenger Train on Subgrade in Earthquake

摘要

A train-track-subgrade coupled model is established to analyze running safety of a passen -ger train in earthquake. Using the r San Fernando ground motion , dynamic responses of the train -track-subgrade systems are calculated. Furthermore, influences r of the earthquake intensity and the running speed on train running safety are analyzed. Finally, the running safety boundary r for a pas -senger train in the earthquake is presented in the paper. The results show that the carbody acceleration and the r wheel-rail vertical force increase linearly with the earthquake intensity , while the wheel-rail lateral force,the wheel load r reduction rate and the derailment coefficient increase nonlinearly. Moreover, the wheel-rail vertical force and the wheel r load reduction rate increase linearly with the train speed,while the carbody acceleration ,the wheel-rail lateral force and r the derailment coefficient increase nonlinearly. As for the running safety boundary of the passenger train ,the wheelset r lateral force is generally the first index exceeding the safety limit value , then which followed by the wheel -rail lateral r force,the derailment coefficient and the wheel load reduction rate in turn.