Investigation on Earthquake Performance of Reinforced Concrete Frames Strengthened with Different Buckling-restrained Braces Properties
DOI:
https://doi.org/10.18196/bce.v5i1.25925Abstract
Buckling-restrained braces (BRBs) are widely adopted for seismic retrofitting, yet the performance trade-offs between stiffness and ductility in high-rise reinforced concrete (RC) frames under region-specific seismic conditions remain underexplored. This study investigates the seismic performance of a 10-story, 5-bay reinforced concrete (RC) frame, comply with Indonesian standards SNI 1726:2019 and SNI 2847:2019 (ASCE 7-16 and ACI 318-14), retrofitted with two distinct buckling-restrained brace (BRB) configurations: (1) BRB with large initial stiffness but less ductility and (2) BRB with low initial stiffness but enhanced ductility. A 2D nonlinear model of the RC frame was developed, featuring 3 m inter-story heights and 6 m span bays. Beam-column elements were modeled as line elements with nonlinear shear and bending springs, while BRBs were represented using a bi-linear hysteresis model. Two BRBs were installed in bays 2 and 4, targeting stories with elevated inter-story drift. Eleven spectrum-matched ground motions were scaled to Indonesian geographical conditions to evaluate seismic responses. Key performance metrics included inter-story drift response and BRB force-displacement behavior. Results demonstrated that BRB with strong initial stiffness effectively reduces peak inter-story displacement compared to BRB with weak stiffness. However, BRB with weak stiffness achieves greater cumulative ductility. Both types of BRB still reduce structural damage but have their unique characteristics. The study uniquely quantifies the stiffness-ductility trade-off in high-rises, demonstrating that strong-stiffness BRBs prioritize immediate drift control, while weak-stiffness BRBs enhance post-yield stability.
Keywords: Seismic performance, reinforced concrete building, parametric study, buckling-restrained brace
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