| Citation: | Chen Lingkun, Wang Lu, Zhai Chencheng, Chen Wenxin, Zhu Liming, Wang Yaozhou, Zhang Qinghua, Zhang Nan, Li Qiao, 2022. Seismic Response of Railway Bridges in Active Complex Tectonic Zones Part Ⅰ: Effects of Fault Effects. Earth Science, 47(3): 867-879. doi: 10.3799/dqkx.2022.019
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There is a growing worry about the impact of near-fault earthquakes on bridges. This paper presents a bridge-soil-pile foundation global modeling technique that stresses the actual advantages of more comprehensive abutment and soil nonlinearity, which may reflect physical events more accurately than a sequence of axial loads. The nonlinear soil-pile foundation model is established using p-y, t-z, and q-z curves and the SHAKE91 program. The bilinear model is employed to simulate the hysteretic characteristics of the pier and pile; the high-speed railway bridge-soil-pile model is established in this paper. The elastic-plastic seismic response of a high-speed railway bridge subjected to the near-fault ground motions and the Ap/vp ratio on the seismic response of the bridge-pile system is analyzed. The results indicate that the Ap/vp ratio influences the bridge's lateral and vertical response in different ways. In contrast with the fixed base bridge, the lateral response of the bridge decreases for the bridge-foundation system. On the other hand, for the same bridge-foundation system, the vertical response decreases when Ap/vp is greater than 10, which demonstrates the vertical NF ground motion impacts the seismic response of the bridge in the high-frequency range.
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