梁桥多级设防SMA减震装置

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Abstract During the near-fault earthquake action, isolated bridges experience significant in-plane displacement and residual displacements, which may cause the bridge girders to unseating and even complete collapse.In this paper, a multi-level performance SMA-based isolation system was proposed.This device consists of 3-levels of SMA cables and conventional isolators, which are assembled in parallel.With the intensity of earthquake increasing, each level of SMA cables will be activated in a sequence to meet different performance requirements.Based on OpenSees and Sap2000 platforms, the lateral restoring force-displacement relationship and the hysteresis model of a specific SMA-based isolator was explored.The effectiveness of the two platforms for simulating the isolator was also investigated.Furthermore, a case study of a continuous bridge was conducted and parameter analysis about effective sectional area was conducted to testify the effectiveness of the isolation system in multi-level aseismic design.It turns out that this device has better displacement reduction, restoration, and energy dissipation capability.In addition, it has the advantages of multi-level performances, which ensures itself a bright prospect in application.

Key words： seismic design of bridges shape memory alloy multi-level performance seismic design OpenSees multi-stage seismic control method

Received: 25 April 2018 Published: 15 December 2019

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	Articles by authors
	CAO Sasa1
	WU Suiwen2
	SUN Zhuo1
	WANG Huan1
	YANG Jun1

Cite this article:

CAO Sasa1,WU Suiwen2,SUN Zhuo1, et al. A multi-level performance SMA-based isolation system in girder bridges[J]. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(24): 209-217.

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http://jvs.sjtu.edu.cn/EN/ OR http://jvs.sjtu.edu.cn/EN/Y2019/V38/I24/209

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