The monorail beam (Z206-25) of Chongqing straddle monorail transit system was selected as the research object. The spatial coupling vibration model of vehicle-bridge system was established and corresponding procedure was compiled. The effect of travelling, steering and stabilizing wheel pressure respectively and typical combined wheel pressure on the system vibration was studied. The results show that the change of wheel pressure has great effect on the response of the system. The vertical response value increases with travelling wheel pressure increasing. The lateral response value increases with steering wheel pressure increasing, while the effect of stabilizing wheel pressure on the response is irregular. The effect of steering wheel pressure is greater than that of stabilizing wheel pressure on lateral responses. The effect of all of travelling and steering wheel pressure is greater than that of unilateral wheel pressure on the response. The effect tendency of stabilizing wheel pressure on the response is opposite to that of unilateral wheel pressure.
The running performance of train on Hubian bridge was analyzed with energy random analysis theory for derailment. The calculated result shows that the running safety of train cannot be ensured with the existing operation condition, and the measurement of rate-limiting or reinforcement is needed to be taken for this bridge. A method for establishing index of traffic safety for railway bridge was proposed. The detailed contents of the method are as follows. The lateral amplitude on the middle of beam is determined as index for traffic safety for beam-pier system. The critical beam-pier system with which the running performance of train can be guaranteed is determined. The lateral amplitude of critical beam-pier system is calculated and determined as limit value for traffic safety. The limit value of lateral amplitude for traffic safety for Hubian bridge is determined as L/6400.
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