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摩擦摆支座隔震铁路连续梁桥振动台试验研究

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Abstract To investigate the isolation performance and dynamic behavior of a continuous bridge with friction pendulum bearings under earthquake, taking a (24+32+24)m continuous railway bridge with constant depth box section as a prototype, and the shaking table tests of a 1/10 scale bridge model were conducted.Three typical near-field ground motion records were selected as the input excitations, and the longitudinal and vertical waves were combinedly input.The phenomena in shaking process and post-earthquake damage were observed, the seismic responses were analyzed in terms of displacement, acceleration and strain.The results show that there are obvious differences in responses under different near-fault earthquake waves.With the increase of the earthquake wave’s peak ground motion（PGA）, the average longitudinal displacement amplitude of middle piers is smaller than that of side piers, and its increase rate is much smaller than that of side piers.When the PGA is increased, the isolation efficiency and effect of friction pendulum bearing (FPB) is higher and better.Only a few cracks appear under the 0.5g earthquake wave, and the maximum longitudinal reinforcement strain is only 786 με in the mid pier, which is far away from the rebar yielding strain, indicating that this pier is not in the yield state and the FPBs can reduce the internal force response effectively.

Key words： railway continuous girder-bridge friction pendulum bearing（FPB） shaking table test seismic isolation seismic response

Received: 12 February 2020 Published: 28 July 2021

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	Articles by authors
	SHAO Changjiang
	XIAO Zhenghao
	QI Qiming
	WEI Wang
	HE Junming

Cite this article:

SHAO Changjiang,XIAO Zhenghao,QI Qiming, et al. Shaking table test on a railway continuous girder bridge with friction pendulum bearings[J]. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(14): 292-298.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2021/V40/I14/292

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