Vertical accelerations of bridges — a new limit state

摘要

The high speed trains intensively excite the railway bridges and destabilize the ballast in some cases. Therefore, a simple theoretical model of a bridge was set up and yields the deflections, bending moments and vertical accelerations. The paper shows the effect of the train speed, span of bridges, their weights and damping on the vertical accelerations of bridges. Both concrete and steel bridges of spans 5 to 50 m, three types of trains, ICE 2, Eurostar (TGV) and Talgo AV2, at speeds 5 to 500 km/h were investigated. The highest dynamic effects appear at resonance.