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Near-fault directivity pulse-like ground motion effect on high-speed railway bridge

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Abstract

The vehicle-track-bridge (VTB) element was used to investigate how a high-speed railway bridge reacted when it was subjected to near-fault directivity pulse-like ground motions. Based on the PEER NAG Strong Ground Motion Database, the spatial analysis model of a vehicle-bridge system was developed, the VTB element was derived to simulate the interaction of train and bridge, and the elasto-plastic seismic responses of the bridge were calculated. The calculation results show that girder and pier top displacement, and bending moment of the pier base increase subjected to near-fault directivity pulse-like ground motion compared to far-field earthquakes, and the greater deformation responses in near-fault shaking are associated with fewer reversed cycles of loading. The hysteretic characteristics of the pier subjected to a near-fault directivity pulse-like earthquake should be explicitly expressed as the bending moment-rotation relationship of the pier base, which is characterized by the centrally strengthened hysteretic cycles at some point of the loading time-history curve. The results show that there is an amplification of the vertical deflection in the girder’s mid-span owing to the high vertical ground motion. In light of these findings, the effect of the vertical ground motion should be used to adjust the unconservative amplification constant 2/3 of the vertical-to-horizontal peak ground motion ratio in the seismic design of bridge.

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Correspondence to Ling-kun Chen  (陈令坤).

Additional information

Foundation item: Project(2013CB036203) supported by the National Basic Research Program of China; Project(2013M530022) supported by China Postdoctoral Science Foundation; Project(2013-K5-31) supported by Science and Technology Plan of Ministry of Housing and Urban-Rural Development of China; Project supported by High-level Scientific Research Foundation for the Introduction of Talent of Yangzhou University, China; Project supported by the Open Fund of the National Engineering Laboratory for High Speed Railway Construction, China; Project(IRT1296) supported by the Program for Changjiang Scholars and Innovative Research Team in University, China; Project(50908236) supported by the National Natural Science Foundation of China

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Chen, Lk., Zhang, N., Jiang, Lz. et al. Near-fault directivity pulse-like ground motion effect on high-speed railway bridge. J. Cent. South Univ. 21, 2425–2436 (2014). https://doi.org/10.1007/s11771-014-2196-9

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  • DOI: https://doi.org/10.1007/s11771-014-2196-9

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