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<p>The paper presents an experimental and comparative investigation on the effects of different square lateral reinforcement spacings of 150&#xa0;mm, 90&#xa0;mm and 50&#xa0;mm on the stress–strain of confined concrete. Experimental work was conducted on twelve square reinforced concrete columns, dimensions of 150 × 150 × 600 (mm) which divided into three groups of different cube compressive strengths of 20&#xa0;MPa, 27.3&#xa0;MPa and 31.9&#xa0;MPa. Five theoretical models from previous research were selected to comparatively study with the experimental work. The stress–strain of longitudinal steel bars was calculated with considering the buckling effect. The test results show that square lateral reinforcement improves the peak stress, corresponding strain at peak stress and therefore ductility of confined concrete. In addition, the lateral reinforcement changes the failure modes of reinforced concrete columns from slant shear failure for un-confined concrete to combination of slant shear and lateral expansion failure for confined concrete. Within the selected models, the results also provide some guidance for designers in selecting the most appropriate theoretical models for calculating of confined concrete under square lateral confinement. Firstly, Vallenas et al. and Hoshikuma et al. models predict the highest and smallest confined compressive strength, respectively. Secondly, the lowest and highest ductilities are calculated by Chung et al. and Saatcioglu and Razvi, respectively. Finally, Scott et al. model shows better prediction of the stress–strain of experimental confined normal concrete.</p>

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Effect of square lateral reinforcement on the stress strain of confined concrete considering the buckling effect of longitudinal steel bars: an experimental and comparative study

  • 期刊论文

  • 发表日期：

    2025年5月13日

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  • Chinh Van Nguyen,
  • Dung Xuan Le,
  • Hiep Van Nguyen,
  • Loc Van Truong,
  • Tinh Phuoc Le

摘要

The paper presents an experimental and comparative investigation on the effects of different square lateral reinforcement spacings of 150 mm, 90 mm and 50 mm on the stress–strain of confined concrete. Experimental work was conducted on twelve square reinforced concrete columns, dimensions of 150 × 150 × 600 (mm) which divided into three groups of different cube compressive strengths of 20 MPa, 27.3 MPa and 31.9 MPa. Five theoretical models from previous research were selected to comparatively study with the experimental work. The stress–strain of longitudinal steel bars was calculated with considering the buckling effect. The test results show that square lateral reinforcement improves the peak stress, corresponding strain at peak stress and therefore ductility of confined concrete. In addition, the lateral reinforcement changes the failure modes of reinforced concrete columns from slant shear failure for un-confined concrete to combination of slant shear and lateral expansion failure for confined concrete. Within the selected models, the results also provide some guidance for designers in selecting the most appropriate theoretical models for calculating of confined concrete under square lateral confinement. Firstly, Vallenas et al. and Hoshikuma et al. models predict the highest and smallest confined compressive strength, respectively. Secondly, the lowest and highest ductilities are calculated by Chung et al. and Saatcioglu and Razvi, respectively. Finally, Scott et al. model shows better prediction of the stress–strain of experimental confined normal concrete.