Wind-Vehicle-Bridge Dynamic Response Analysis of Flexible Arch Bridge with Super-Long Span Steel Truss Beam

In this study, the influence of train response of double-track trains on long-span steel truss flexible arch bridge under different wind fields and speed conditions is investigated. Based on computational fluid dynamics theory, multi-body dynamics theory and finite element theory, the flexible bridge model is established by finite element method, and the rigid train model is established by multi-body dynamics. The responses of trains and bridges under different wind speeds and vehicle speeds are discussed and analyzed by numerical simulation. The main conclusion is that in the absence of wind, as far as the bridge response is concerned, the two-lane traffic can restrain the unbalanced load of the train and effectively reduce the lateral vibration in the bridge span. As far as vehicle response is concerned, the response of the train when traveling in two lanes is not significantly increased compared with that when traveling in one lane. Under windy conditions, the lateral vibration of bridges and trains increases, and the lateral force of trains increases with the increase of wind speed, and the lateral force of trains increases with the increase of vehicle speed. The influence of wind speed on the lateral force of trains is more obvious than that of vehicle speed.