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<p>This paper introduces a simplified shear load-slip analytical model for evaluating shear transfer across monolithic uncracked (MU) interfaces, which was developed based on push-off tests and the proposed interface shear mechanism. The model formulates equations for four characteristic shear loads—cracking load (<i>V</i><sub>cr</sub>), ultimate shear capacity (<i>V</i><sub>u</sub>), residual shear capacity (<i>V</i><sub>r</sub>), and failure load (<i>V</i><sub>f</sub>)—along with their corresponding slip deformation. Fifteen push-off tests were conducted to assess the contribution of shear reinforcement throughout the shear resistant process, varying the shear reinforcement ratio, and the yield strength of shear reinforcement. Results from the push-off test and subsequent analysis of the interface shear mechanism indicate that <i>V</i><sub>cr</sub> is governed primarily by concrete properties, whereas<i> V</i><sub>u</sub> arises mainly from concrete cohesion and shear friction generated by the unyielded shear reinforcement, with concrete cohesion playing the dominant role. A comparative analysis demonstrates that the model’s prediction closely match the observed shear load-slip responses. Notably, the proposed <i>V</i><sub>u</sub> equation, incorporating the elastic modulus (rather than yield strength) of shear reinforcement, was systematically compared to existing design equations from the American Concrete Institute (ACI), the Precast/Prestressed Concrete Institute (PCI), Canadian Highway Bridge Design Code (CSA), and AASHTO LRFD Bridge Design Specifications, using a database of 135 MU interface push-off test results. The evaluation shows that the proposed equation offers significant advantages over existing equations, achieving an average experimental–to–nominal shear capacity ratio of 1.06 and a coefficient of variation of 0.17.</p>

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Simplified analytical modeling of shear transfer across monolithic uncracked reinforced concrete interfaces: experimental analysis and design code evaluation

  • 期刊论文

  • 发表日期：

    2025年11月10日

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  • Jie Liu,
  • Beifang Zhou,
  • Xiangyu Huang,
  • Juanjuan Chen

摘要

This paper introduces a simplified shear load-slip analytical model for evaluating shear transfer across monolithic uncracked (MU) interfaces, which was developed based on push-off tests and the proposed interface shear mechanism. The model formulates equations for four characteristic shear loads—cracking load (Vcr), ultimate shear capacity (Vu), residual shear capacity (Vr), and failure load (Vf)—along with their corresponding slip deformation. Fifteen push-off tests were conducted to assess the contribution of shear reinforcement throughout the shear resistant process, varying the shear reinforcement ratio, and the yield strength of shear reinforcement. Results from the push-off test and subsequent analysis of the interface shear mechanism indicate that Vcr is governed primarily by concrete properties, whereas Vu arises mainly from concrete cohesion and shear friction generated by the unyielded shear reinforcement, with concrete cohesion playing the dominant role. A comparative analysis demonstrates that the model’s prediction closely match the observed shear load-slip responses. Notably, the proposed Vu equation, incorporating the elastic modulus (rather than yield strength) of shear reinforcement, was systematically compared to existing design equations from the American Concrete Institute (ACI), the Precast/Prestressed Concrete Institute (PCI), Canadian Highway Bridge Design Code (CSA), and AASHTO LRFD Bridge Design Specifications, using a database of 135 MU interface push-off test results. The evaluation shows that the proposed equation offers significant advantages over existing equations, achieving an average experimental–to–nominal shear capacity ratio of 1.06 and a coefficient of variation of 0.17.