Journal
JOURNAL OF CENTRAL SOUTH UNIVERSITY
Volume 21, Issue 6, Pages 2425-2436Publisher
JOURNAL OF CENTRAL SOUTH UNIV TECHNOLOGY
DOI: 10.1007/s11771-014-2196-9
Keywords
element; near-fault ground motion; directivity pulse; high-speed railway bridge; earthquake response
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Funding
- National Basic Research Program of China [2013CB036203]
- China Postdoctoral Science Foundation [2013M530022]
- Science and Technology Plan of Ministry of Housing and Urban-Rural Development of China [2013-K5-31]
- High-level Scientific Research Foundation for the Introduction of Talent of Yangzhou University, China
- Open Fund of the National Engineering Laboratory for High Speed Railway Construction, China
- Program for Changjiang Scholars and Innovative Research Team in University, China [IRT1296]
- National Natural Science Foundation of China [50908236]
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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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