Previous studies concerning concrete columns confined with fiber reinforced polymer (FRP) sheets have focused primarily on circular sections, which are considered uniformly confined. This research is aimed at understanding and predicting the more complex behavior of FRP-confined rectangular columns under axial loading.; A total of twenty-two scaled down specimens of dimensions 125 mm x 125 mm, 125 mm x 175 mm, and 125 mm x 200 mm was prepared and loaded in compression up to failure. The effects of varying the parameters of the column's aspect ratio (length/width), corner radius and fiber thickness were investigated. The experimental results obtained from these new experiments were combined with similar data contained in the literature presented by independent researchers. This compiled data was used to evaluate the performance of the previously proposed compressive strength and stress-strain models.; A new design-oriented model was developed for predicting the entire stress-strain curves for rectangular FRP-confined concrete in rectangular columns. An evaluation of this newly proposed theoretical model against available experimental data revealed good correlation.
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机译：以前有关用纤维增强聚合物（FRP）板约束的混凝土柱的研究主要集中在圆形截面上，而圆形截面被认为是均匀约束的。这项研究旨在了解和预测FRP约束矩形柱在轴向载荷下的更复杂行为。总共准备了22个按比例缩小的尺寸为125 mm x 125 mm，125 mm x 175 mm和125 mm x 200 mm的样品，并压缩加载直至破裂。研究了改变立柱纵横比（长/宽），拐角半径和纤维厚度等参数的影响。从这些新实验中获得的实验结果与独立研究人员提供的文献中包含的相似数据相结合。该编译数据用于评估先前提出的抗压强度和应力应变模型的性能。开发了一种新的面向设计的模型，用于预测矩形FRP约束混凝土在矩形柱中的整个应力-应变曲线。根据现有的实验数据对该新提出的理论模型进行评估显示出良好的相关性。
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