Elastoplastic bridge deck response spectra of high-speed railway simply-supported girder bridge with CRTSII track system

Abstract

The seismic damage to ancillary facilities on high-speed railway (HSR) bridges can affect the normal movement of trains. To propose the bridge deck acceleration response spectra of the typical HSR simply-supported girder bridge for simplifying the seismic responses analysis of the facilities on bridges, the finite element models of the HSR multi-span simply-supported girder bridges with CRTSII track were established, and the numerical model was validated by tests. Besides, the effects of the span number, peak ground acceleration (PGA), pier height on the seismic acceleration and response spectra of the bridge deck were investigated. Afterward, the bridge acceleration amplification factor curves and bridge deck response spectra with different PGAs and pier heights were obtained. The formula for bridge deck acceleration amplification factor, with a 95% guarantee rate, was fitted. Moreover, the finite element models of the overhead contact lines (OCL) mounted on rigid base and bridges were established to validate the fitted formula. The results indicated that the maximum seismic acceleration response is in the midspan of the beam. The proposed formula for the bridge deck acceleration response spectra can be used to analyze the earthquake response of the OCL and other ancillary facilities on HSR simply-supported girder bridges. The bridge deck acceleration response spectra are conservative in terms of structural safety and can significantly improving the analysis efficiency.

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