The shaking table test study of elastic seismic response of high-speed railway bridge considering track constraint

To study the elastic seismic response of track restraints on high speed railway under the earthquake, two 1/20th scaled pier models are designed which represent with track restraints and without track restraints for experimental study. By shaking table tests for earthquake simulation, dynamic characteristics, the acceleration, displacement and stress response of test models with and without track restraints are analyzed and compared for the same seismic excitation. Results indicate that the 1st order natural frequency and acceleration response on the top of fixed pier increase, while track restraints decrease relatively and absolute fixed pier top displacement and fixed pier bottom stress response along longitudinal direction. To some extent, track constraints reduce seismic response of the ballastless track for high-speed railway bridge. The conclusion has great theoretical and practical significance on improving aseismatic design standards of high-speed railway bridge, reducing earthquake losses and ensuring smooth flow of traffic as soon as possible after the earthquake.