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首页> 外文期刊>Journal of Composites for Construction >Bond Strength of Lap-Spliced Bars in Concrete Confined with Composite Jackets
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Bond Strength of Lap-Spliced Bars in Concrete Confined with Composite Jackets

机译：复合夹套混凝土中搭接钢筋的粘结强度

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摘要

The effectiveness of fiber-reinforced polymer (FRP) and textile-reinforced mortar (TRM) jackets was investigated experimentally and analytically in this study to confine old-type reinforced concrete (RC) columns with limited capacity because of bond failure at lap-splice regions. The local bond strength between lap-spliced bars and concrete was measured experimentally along the lap-splice region of six full-scale RC columns subjected to cyclic uniaxial flexure under constant axial load. The bond strength of the two column specimens tested without retrofitting was found to be in good agreement with the predictions given by two existing bond models. These models were modified to account for the contribution of composite material jacketing to the bond resistance between lap-spliced bars and concrete. The effectiveness of FRP and TRM jackets against splitting at lap splices was quantified as a function of jacket properties and geometry as well as in terms of the jacket effective strain, which was found to depend on the ratio of lap-splice length to bar diameter. Consequently, simple equations for calculating the bond strength of lap splices in members confined with composite materials (FRP or TRM) are proposed.
机译：在这项研究中，通过实验和分析方法研究了纤维增强聚合物（FRP）和纺织品增强砂浆（TRM）护套的有效性，以限制由于搭接区域粘结失效而使有限容量的老式钢筋混凝土（RC）柱受限。搭接钢筋与混凝土之间的局部粘结强度是在恒定的轴向载荷下，沿六个承受单轴挠性循环的全尺寸RC柱的搭接区域实验测量的。发现未经改造而测试的两个柱样品的结合强度与两个现有结合模型给出的预测非常吻合。对这些模型进行了修改，以说明复合材料护套对搭接拼接钢筋与混凝土之间的粘结阻力的影响。 FRP和TRM护套在搭接接头处抗裂的有效性根据护套的性能和几何形状以及护套有效应变进行了量化，发现该有效应变取决于搭接接头长度与钢筋直径的比值。因此，提出了用于计算复合材料（FRP或TRM）约束构件中搭接接头粘结强度的简单方程式。

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