Abstract:Aiming at the shortcomings of nonlinear finite element method such as time-consuming, effort-consuming and narrow applicability when analysing the dynamic time-history responses to vehicle-bridge collision.A calculation method for the impact spectrum of vehicle-bridge collision was proposed with reference to the concept of seismic response spectrum.63 impact force time-history curves were obtained by constructing 7 finite element models of “vehicle-rigid wall” collision systems and solving their key files.By using the method of spectral analysis, the displacement amplification factor of a single-degree-of-freedom system under impact force was solved. The statistical relation between the amplification factor and the structural period of vehicles at different speeds was observed.The mathematical expressions for the impact spectrum of vehicle-bridge collision were thus obtained by fitting the period-displacement amplification factor curves.Finally, the suggestions for the practical use of impact spectrum were proposed.
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