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首页> 外文期刊>Journal of Composites for Construction >Strengthening Of Eccentrically Loaded Reinforced Concrete Columns With Fiber-reinforced Polymer Wrapping System: Experimental Investigation And Analytical Modeling
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Strengthening Of Eccentrically Loaded Reinforced Concrete Columns With Fiber-reinforced Polymer Wrapping System: Experimental Investigation And Analytical Modeling

机译：纤维增强聚合物包裹系统对偏心受压钢筋混凝土柱的加固：试验研究与分析模型

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摘要

This paper presents the results of experimental-program and analytical modeling for performance evaluation of a fiber-reinforced polymer (FRP) wrapping system to upgrade eccentrically loaded reinforced concrete (RC) columns. A total of 12 RC columns with end corbels were tested. The test specimen had an overall length of 1,200 mm. Each end corbel had a cross section of 250 × 250 mm and a length of 350 mm. The specimen in the test region was 125 × 125 mm having a longitudinal steel ratio of 1.9%. Test parameters included confinement condition (no wrapping, full FRP wrapping, and partial FRP wrapping), and eccentricity-to-section height (elh) ratio (0.3, 0.43, 0.57, and 0.86). Research findings indicated that the strength gain caused by FRP wrapping decreased as elh was increased. Full FRP wrapping resulted in about 37% enhancement in compression strength at a nominal e/h of 0.3, whereas only 3% strength gain was recorded at a nominal elh of 0.86. The compression strengths of the partially wrapped columns were on average 5% lower than those of the fully wrapped columns. A nonlinear, second-order analysis that accounts for the change in eccentricity caused by the lateral deformation was proposed to predict the columns strength. A comparison between analytical and experimental results of the present study in addition to data published in the literature demonstrated the accuracy and validity of the proposed analysis.
机译：本文介绍了用于评估纤维增强聚合物（FRP）包裹系统以升级偏心加载的钢筋混凝土（RC）柱的性能的实验程序和分析模型的结果。总共测试了12个带端梁的RC柱。试样的总长度为1200mm。每个端梁的横截面为250×250毫米，长度为350毫米。在测试区域中的样品为125×125mm，纵向钢比率为1.9％。测试参数包括限制条件（不包裹，完全FRP包裹和部分FRP包裹）以及偏心距与截面高度（elh）的比率（0.3、0.43、0.57和0.86）。研究结果表明，随着elh的增加，FRP包裹引起的强度增加降低。完全的FRP包裹使标称e / h为0.3时压缩强度提高了约37％，而标称elh为0.86时仅记录了3％的强度增加。部分包裹的色谱柱的抗压强度比完全包裹的色谱柱的抗压强度平均低5％。提出了一种非线性的二阶分析方法，它可以解释由横向变形引起的偏心率变化，以预测圆柱强度。除了文献中发表的数据外，本研究的分析结果与实验结果之间的比较证明了所提出分析的准确性和有效性。

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