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<p>This study investigates the seismic performance of exterior beam–column connections (BCC) using Normal Strength Concrete (NSC), HighStrength Concrete (HSC), and Engineered Cementitious Composites (ECC) in Special Moment Resisting Frames (SMRF). Three fullscale BCC specimens, representing sections of a fourstory building, were tested under quasistatic loading conditions. However, existing investigations have been confined to small or reducedscale specimens with varied reinforcement details, and no prior study has systematically compared fullscale exterior beam–column connections cast monolithically with ECC (omitting transverse ties) against normal and highstrength concrete counterparts under SMRF precompression levels and quasistatic cyclic. This work therefore fills that gap by performing a fullscale evaluation, extending ECC and HSC material into the plastichinge zone while entirely eliminating lateral hoops and benchmarking their seismic performance against a conventional NSC control. The control specimen was constructed using NSC and transverse reinforcement, while the joints of the other specimens were cast using ECC and HSC, with the ECC specimen excluding transverse reinforcement. Monitoring was conducted using strain gauges and LVDTs to assess crack patterns, loaddisplacement behavior, energy dissipation, hysteretic response, and ductility. The results reveal that ECC significantly outperformed NSC and HSC, with a 28.96% increase in ultimate load capacity and a 23.95% improvement in ductility compared to NSC. ECC also dissipated 58.06% more energy, while HSC showed a 50.7% reduction in energy dissipation, reflecting its brittle behavior. These findings suggest that ECC offers a superior alternative for enhancing the seismic resilience of BCC, even without transverse reinforcement.</p>

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Comparison of the seismic performance of beam column connections cast with normal strength concrete, high-strength concrete and ECC

  • 期刊论文

  • 发表日期：

    2025年8月23日

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  • Sajjad Wali Khan,
  • Mian Asfahan Ali Gul,
  • Umar Ahmad Noor

摘要

This study investigates the seismic performance of exterior beam–column connections (BCC) using Normal Strength Concrete (NSC), HighStrength Concrete (HSC), and Engineered Cementitious Composites (ECC) in Special Moment Resisting Frames (SMRF). Three fullscale BCC specimens, representing sections of a fourstory building, were tested under quasistatic loading conditions. However, existing investigations have been confined to small or reducedscale specimens with varied reinforcement details, and no prior study has systematically compared fullscale exterior beam–column connections cast monolithically with ECC (omitting transverse ties) against normal and highstrength concrete counterparts under SMRF precompression levels and quasistatic cyclic. This work therefore fills that gap by performing a fullscale evaluation, extending ECC and HSC material into the plastichinge zone while entirely eliminating lateral hoops and benchmarking their seismic performance against a conventional NSC control. The control specimen was constructed using NSC and transverse reinforcement, while the joints of the other specimens were cast using ECC and HSC, with the ECC specimen excluding transverse reinforcement. Monitoring was conducted using strain gauges and LVDTs to assess crack patterns, loaddisplacement behavior, energy dissipation, hysteretic response, and ductility. The results reveal that ECC significantly outperformed NSC and HSC, with a 28.96% increase in ultimate load capacity and a 23.95% improvement in ductility compared to NSC. ECC also dissipated 58.06% more energy, while HSC showed a 50.7% reduction in energy dissipation, reflecting its brittle behavior. These findings suggest that ECC offers a superior alternative for enhancing the seismic resilience of BCC, even without transverse reinforcement.