Parametric Study of Superelastic-Sliding LRB System for Seismic Response Control of Continuous Bridges
Publication: Journal of Bridge Engineering
Volume 25, Issue 9
Abstract
To enhance the normal service adaptability and seismic resistance performance of isolation continuous bridges, a superelastic-sliding lead rubber bearing (SSLRB) isolation system was developed by incorporating shape memory alloy (SMA) wires with sliding-LRB. A parametric design method was proposed to design the SMA wires in the SSLRB system for the optimum performance of bridges in terms of suppressing the displacement response and in the meantime limiting the increment of the force response in piers. A parametric investigation was performed to obtain the SMA parameters as a critical part of designing the SSLRB system. The seismic responses of bridges isolated by SSLRBs were investigated and compared with those of the same bridges with the conventional sliding-LRBs. The efficiency of the SSLRB system was further demonstrated by conducting a case study. Results verified the effectiveness of the suggested method for optimizing the parameters of SMA wires and the SSLRB system for response control. The displacement responses (e.g., residual displacement) can be effectively mitigated, and in the meantime the seismic demand of the piers can be suppressed. This study demonstrates that the proposed SSLRB isolation system can maintain stable re-centering performance against near-fault earthquakes.
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Acknowledgments
The research work was financially supported by the National Ten Thousand Talent Program for Young Top-notch Talents (No. W03070080), the National Natural Science Foundation of China (No. 51578151, 51722804), the Postgraduate Research & Practice Innovation Program of Jiangsu Province (No. KYCX18_0117), the Scientific Research Foundation of Graduate School of Southeast University (No. YBPY1925), the Key Research & Development Plan Program of Jiangsu Province (No. BE2018120), and the National Scholarship Fund of China Scholarship Council (No. 201806090090). The authors also would like to thank the Pacific Earthquake Engineering Research Center for providing the available data.
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Journal of Bridge Engineering
Volume 25 • Issue 9 • September 2020
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© 2020 American Society of Civil Engineers.
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Received: Sep 3, 2019
Accepted: Apr 15, 2020
Published online: Jun 17, 2020
Published in print: Sep 1, 2020
Discussion open until: Nov 17, 2020
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