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<p>Recently, shape memory alloy (SMA) buckling restrained braces (BRBs) have received substantial interest because of their potential for controlling residual drifts following earthquake events. This study evaluates the seismic performance of 3- and 6-story reinforced concrete (RC) buildings strengthened by steel, SMA, and hybrid steel–SMA BRBs. The hybrid design consists of a combination of equal-strength diagonal steel and SMA BRBs. Two upgrade strength levels, 150% and 200% from the original levels, are considered. The buildings are subjected to static pushover loading and a suite of earthquake records. The peak and residual drifts and the brace ductility ratios form the basis for the seismic performance evaluation. The results indicate that the hybrid steel–SMA design exhibited greater stiffness and reduced lateral drift demands than the SMA-based design. The residual drift ratios of the hybrid steel–SMA design were slightly higher than those of the SMA-based design but significantly lower than those of the steel-based design. While the hybrid steel–SMA approach requires only 50% of the SMA weight compared to the SMA-based design, it has proven to be very effective in reducing both maximum and residual lateral deformations.</p>

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Upgrading the Seismic Capacity of RC Frames by Hybrid Steel–SMA BRBs

  • 期刊论文

  • 发表日期：

    2025年5月12日

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  • Mostafa Ramadan,
  • Hesham Zein Eldin,
  • Hamdy Abou-Elfath,
  • Nour El-Heweity

摘要

Recently, shape memory alloy (SMA) buckling restrained braces (BRBs) have received substantial interest because of their potential for controlling residual drifts following earthquake events. This study evaluates the seismic performance of 3- and 6-story reinforced concrete (RC) buildings strengthened by steel, SMA, and hybrid steel–SMA BRBs. The hybrid design consists of a combination of equal-strength diagonal steel and SMA BRBs. Two upgrade strength levels, 150% and 200% from the original levels, are considered. The buildings are subjected to static pushover loading and a suite of earthquake records. The peak and residual drifts and the brace ductility ratios form the basis for the seismic performance evaluation. The results indicate that the hybrid steel–SMA design exhibited greater stiffness and reduced lateral drift demands than the SMA-based design. The residual drift ratios of the hybrid steel–SMA design were slightly higher than those of the SMA-based design but significantly lower than those of the steel-based design. While the hybrid steel–SMA approach requires only 50% of the SMA weight compared to the SMA-based design, it has proven to be very effective in reducing both maximum and residual lateral deformations.