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<p>This paper deals with the structural performance of long columns of reinforced hybrid self-compacting concrete (SC-HC) under eccentric biaxial load. The hybrid cross-section consists of an SC-HSC outer shell and an SC-NC core. Six full-scale specimens under different eccentricity ratios in biaxial loading (0.25, 0.65, and 0.9) were tested to investigate the effect of the outer shell material on the axial load capacity, lateral and axial deflection, moment–curvature response, and failure modes. The results showed that replacing the outer layer with SC-HSC significantly improved the structural behavior of columns. The enhancements in the axial load capacity varied from 10.39 to 28.85% and the flexural capacity was up to 27.45% higher than that for the control specimens. In addition, hybrid columns showed enhanced curvature ductility and more stable post-peak behavior. The results validate the efficiency of SC-HSC shells in increasing the strength and ductility of slender biaxial bent columns for high-eccentricity cases and the necessity for complete bond interaction between concrete layers for efficient performance.</p>

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Influence of biaxial eccentricity loading on the structural response of slender hybrid SCC columns with HSC shells

  • 期刊论文

  • 发表日期：

    2026年2月19日

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

摘要

This paper deals with the structural performance of long columns of reinforced hybrid self-compacting concrete (SC-HC) under eccentric biaxial load. The hybrid cross-section consists of an SC-HSC outer shell and an SC-NC core. Six full-scale specimens under different eccentricity ratios in biaxial loading (0.25, 0.65, and 0.9) were tested to investigate the effect of the outer shell material on the axial load capacity, lateral and axial deflection, moment–curvature response, and failure modes. The results showed that replacing the outer layer with SC-HSC significantly improved the structural behavior of columns. The enhancements in the axial load capacity varied from 10.39 to 28.85% and the flexural capacity was up to 27.45% higher than that for the control specimens. In addition, hybrid columns showed enhanced curvature ductility and more stable post-peak behavior. The results validate the efficiency of SC-HSC shells in increasing the strength and ductility of slender biaxial bent columns for high-eccentricity cases and the necessity for complete bond interaction between concrete layers for efficient performance.