Abstract
An innovative self-centering shape memory alloy (SMA) brace aiming at improving the seismic performance and self-centering capacity of steel frame structures is proposed in this paper. A series of cyclic loading tests with six self-centering SMA brace (SC-SMAB) specimens was carried out to investigate the effects of SMA area, bolt torque and initial SMA force on the hysteresis curves, energy dissipation and self-centering capacity. In addition, based on the experimental results, a numerical model of SC-SMAB with the improved Graesser and Bouc–Wen model was established and validated. Three different single-bay plan configurations of 9 storey steel frames including bare steel frame (BSF), steel frame with slip braces (SF-SB) and steel frame with SC-SMABs (SF-SCB) were analyzed to evaluate the seismic response. The test results show that the SC-SMAB with the bolt torque of 10 N M and initial SMA force of 5 kN has the maximum bearing force and self-centering capacity ratio. The established numerical model can accurately predict the seismic performance of the SC-SMAB. The inter-story drift ratio, roof displacement and roof acceleration of SF-SCB are lower than those of the BSF and SF-SB evidently, which decrease by 62.21%, 29.46% and 28.36% respectively from BSF. The hysteresis curve of SC-SMAB in the steel frame has nearly ideal flag-shape with high bearing force, good energy dissipation capacity, small residual deformation and outstanding re-centering capacity.
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The data used to support the findings of this study are available from the corresponding author upon request.
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Acknowledgements
The authors gratefully acknowledge the research grant provided by the National Nature Science Foundation of China (Nos. 51908268, 52368022), Young Leader of Science and technology research project for Jiangxi Bureau of Geology (2022JXDZKJRC09), National Nature Science Foundation of Jiangxi Province (No. 20224BAB204062), Young Leader of Science and technology research project for Jiangxi Province (20232BCJ23065).
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Hu, S., Chang, L., Zhang, B. et al. Seismic Response of Resilient Steel Frame with Self-Centering SMA Brace. Int J Steel Struct 23, 1587–1601 (2023). https://doi.org/10.1007/s13296-023-00789-1
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DOI: https://doi.org/10.1007/s13296-023-00789-1