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首页> 美国卫生研究院文献>Polymers >Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions
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Evaluation of FRP Confinement Models for Substandard Rectangular RC Columns Based on Full-Scale Reversed Cyclic Lateral Loading Tests in Strong and Weak Directions

机译：基于强和弱方向的全尺寸反向循环侧向荷载试验评估不合格矩形RC柱的FRP约束模型

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摘要

Although many theoretical and experimental studies are available on external confinement of columns using fiber-reinforced polymer (FRP) jackets, as well as numerous models proposed for the axial stress-axial strain relation of concrete confined with FRP jackets, they have not been validated with a sufficient amount and variety of experimental data obtained through full-scale tests of reinforced concrete (RC) columns with different geometrical and mechanical characteristics. Particularly, no systematical experimental data have been presented on full-scale rectangular substandard RC columns subjected to reversed cyclic lateral loads along either their strong or weak axes. In this study, firstly, test results of five full-scale rectangular substandard RC columns with a cross-sectional aspect ratio of two (300 mm × 600 mm) are briefly summarized. The columns were tested under constant axial load and reversed cyclic lateral loads along their strong or weak axes before and after retrofitting with external FRP jackets. In the second stage, inelastic lateral force-displacement relationships of the columns are obtained analytically, making use of the plastic hinge assumption and different FRP confinement models available in the literature. Finally, the analytical findings are compared with the test results for both strong and weak directions of the columns. Comparisons showed that use of different models for the stress-strain relationship of FRP-confined concrete can yield significantly non-conservative or too conservative retrofit designs, particularly in terms of deformation capacity.
机译：尽管有许多关于使用纤维增强聚合物（FRP）外套进行柱子外部约束的理论和实验研究，以及为约束FRP外套的混凝土的轴向应力-轴向应变关系建议的众多模型，但它们尚未得到验证。通过对具有不同几何和机械特性的钢筋混凝土（RC）柱进行全面测试，可以获得足够数量的各种实验数据。特别是，没有完整的矩形次标准RC柱沿其长轴或短轴承受反向循环侧向荷载的系统实验数据。在这项研究中，首先，简要总结了五根横截面纵横比为2（300 mm×600 mm）的全尺寸矩形不合格RC柱的测试结果。在对外部FRP护套进行改造之前和之后，对圆柱进行恒定的轴向载荷和沿其强弱轴的反向循环横向载荷的测试。在第二阶段，利用塑性铰链假设和文献中可用的不同FRP约束模型，以解析方式获得了柱的非弹性横向力-位移关系。最后，将分析结果与柱子强方向和弱方向的测试结果进行比较。比较表明，对FRP约束混凝土的应力-应变关系使用不同的模型会产生明显的非保守或过于保守的改造设计，特别是在变形能力方面。

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