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<p>The present study is concerned with the structural behavior of slender reinforced hybrid self-compacting concrete (SC-HC) columns reinforced with NSM GFRP bars and CFRP strips under uni-axial eccentric loading. Six specimens were examined including control, hybrid and reinforced columns at medium (e/h = 0.65) and large (e/h = 0.9) eccentricities. The form outer layer of the shells was constructed using SC-HSC, and the core was constructed using SC-NSC. It was obtained that by adding the HSC outer shells the enhancement in both axial and flexural strengths achieved the 22.6% and 26.2% for axial and flexural capacities, respectively, in comparison with control specimens. Furthermore, GFRP bars and CFRP strips NSM strengthening significantly improved performance with good levels of weight capacity increases (61.0%) and moments of resistance increases (71.1%). Failure mechanisms transformed from brittle flexural-compression mode for un-strengthened specimens to ductile buckling mode for strengthened ones. The analysis validates the effectiveness of the hybrid layout and NSM method for enhancing the performance of slender columns under eccentric loads.</p>

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NSM strengthening effect on hybrid SCC slender columns with HSC shells under uniaxial loading

  • 期刊论文

  • 发表日期：

    2026年2月16日

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  • Alaa Ali Salman Al-Taai,
  • Waleed A. Waryosh

摘要

The present study is concerned with the structural behavior of slender reinforced hybrid self-compacting concrete (SC-HC) columns reinforced with NSM GFRP bars and CFRP strips under uni-axial eccentric loading. Six specimens were examined including control, hybrid and reinforced columns at medium (e/h = 0.65) and large (e/h = 0.9) eccentricities. The form outer layer of the shells was constructed using SC-HSC, and the core was constructed using SC-NSC. It was obtained that by adding the HSC outer shells the enhancement in both axial and flexural strengths achieved the 22.6% and 26.2% for axial and flexural capacities, respectively, in comparison with control specimens. Furthermore, GFRP bars and CFRP strips NSM strengthening significantly improved performance with good levels of weight capacity increases (61.0%) and moments of resistance increases (71.1%). Failure mechanisms transformed from brittle flexural-compression mode for un-strengthened specimens to ductile buckling mode for strengthened ones. The analysis validates the effectiveness of the hybrid layout and NSM method for enhancing the performance of slender columns under eccentric loads.