Abstract
The major concerns of buckling-restrained braced frames (BRBFs) are the low post-yield stiffness and excessive residual displacement, which can delay the post-earthquake recovery procedure and enhance the repair cost. The current numerical work presents an innovative buckling-restrained brace (BRB) including a reduced-length hybrid core that is attached to a robust steel pipe. The core is laterally supported and consists of a shape memory alloy (SMA) rod inserted into a steel pipe. The paper represents a detailed description of the proposed device. The performance of the proposed BRB is numerically investigated at the component level using the ABAQUS finite element package. Subsequently, the system-level response of the proposed device is investigated by nonlinear static pushover and dynamic time history analyses in the OpenSEES environment. The results demonstrate that the proposed device shows a two-stage yielding mechanism, benefits the combined hysteretic responses of the SMA and the steel cores, and exhibits a stable and symmetric cyclic behavior with a nearly flag-shaped hysteresis. Furthermore, compared with conventional BRBs, the proposed device reduces the maximum inter-story and particularly the problematic residual drift responses of the BRBFs. Additionally, by an increase in the total area of the SMA core, though the maximum inter-story drift response is slightly increased due to the low elastic modulus of the SMA material, the residual drift response of the BRBFs is further decreased.
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Data Availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by NH and SA. The first draft of the manuscript was written by NH and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Hoveidae, N., Abbasi, S. Improving the Seismic Resilience of Buckling-Restrained Braced Frames by SMA-Based Hybrid Cores. Arab J Sci Eng 49, 5353–5377 (2024). https://doi.org/10.1007/s13369-023-08383-7
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DOI: https://doi.org/10.1007/s13369-023-08383-7