Seismic Analysis of 5-Span High-Speed Railway Continuous Girder Bridge

In recent years, with the development of high-speed rail in China,bridge has a higher proportion in the lines. Every year earthquake occurs many times accidentally in China. In order to ensure the target performance of bridges under earthquake action, we need to be based on the seismic analysis. Only have a deep knowledge of seismic effect discipline, can we enable to guide seismic design economically and reasonably and achieve predetermined target performance. Our study shows that the main vibration mode is a combination of the longitudinal or lateral translation or the revolution around Z axis. Under high-level earthquake, the maximal displacements of side piers and the fixed pier are larger, the maximal longitudinal pier shaft moment of the fixed pier (No.3) or No.5 pier in lateral direction is larger. But the value that exceeds the yield moment is small, which indicates that the development of plasticity is little. The longitudinal shear force of the bearings on the same pier are the same, bearings fixed longitudinally own the largest value. Even bearings whose lateral directions are fixed on the same pier own larger forces. Seen from average maximum values of bearings, all bearings are at the second stage, meeting the requirements that we don’t need to repair or slightly repair the bridge to make it act normally once after an earthquake.