Vibration Response Analysis of Long-Span Suspension Bridge under Wind and CRH2 Train Loads
To study the vibration response of a large-span railroad suspension bridge under the action of CRH2 trains and wind loads, a wind-vehicle-bridge coupling system is established. By setting different wind velocities and different train speeds, the bridge vibration response under different operating conditions of CRH2 trains and wind loads is analysed in depth using a self-calculating program in Fortran language. The results show that:the lateral displacement of large span railroad suspension bridge is more sensitive to wind loads;when wind and train loads act together, the wind loads have a greater effect on the lateral displacement of the bridge, and the train speed has a relatively greater effect on the vertical displacement of the bridge; when the train speed increases from 0 km/h to 350 km/h, the vertical deflection of the main span of the bridge decreases with the increase of wind loads, and when the train speed varies from 350 km/h to 400 km/h, the deflection of the bridge span decreases with the increase of the wind loads. Wind loads and train speeds have a large impact on the vibration response of the bridge, and the train speed should be controlled at different wind speeds in order to achieve the purpose of safe traffic.
万方数据
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