Abstract
In this study, the impact characteristics of a typical railway bridge with ballastless double-block supported track under moving train considering carriage oscillation load is investigated. The train load is modelled as a constant force superimposed with a harmonic force whose frequency is the heaving oscillation frequency of the carriage. The bridge-track system is discretized and modelled using the double-beam elements connected using the elastic springs and viscous dampers. Numerical computations are conducted to investigate the bending moment impact characteristics of the supporting bridge considering the variations of moving speed and oscillating frequency of the moving load. The result shows that the harmonic loads due to the carriage heaving oscillation will induce some important bending moment impact amplification and peak response offset for the studied bridge in operation.
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