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Title |
Seismic Performance of Bridge with Pile Bent Structures in Soft Ground against Near-Fault Ground Motions
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Authors |
선창호(Chang-Ho Sun) ; 안성민(Sung-Min An) ; 김정한(Jung-Han Kim) ; 김익현(Ick-Hyun Kim) |
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DOI |
https://doi.org/10.11112/jksmi.2019.23.7.137 |
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Keywords |
단일형 현장타설밀뚝 교량; 근단층지반운동; 내진성능; 다지점 가진 pile-bent bridge; near-fault ground motion; seismic performance; multi-support excitation |
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Abstract |
For the structures near the seismogenic fault, the evaluation of seismic performance against near-fault ground motions is important as well as for design ground motions. In this study, characteristics of seismic behaviors and seismic performance of the pile-bent bridge constructed on the thick soft soil site with various weak soil layers were analyzed. The input ground motions were synthesized by the directivity pulse parameters for intra-plate regions. The ground motion acceleration histories of each layer were obtained by one-dimensional site response analysis. Each soil layer was modeled by equivalent linear springs, and multi-support excitations with different input ground motions at each soil spring were applied for nonlinear seismic analyses. The analysis result by the near-fault ground motions and ground motions matched to design spectra were compared. In case of the near fault ground motion input, the bridge behaved within the elastic range but the location of the maximum moment occurred was different from the result of design ground motion input.
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