Abstract Fiber reinforced cementitious matrix (FRCM) is emerging as a viable retrofit and confinement technique, in lieu of fiber reinforced polymer (FRP) system which suffers from a number of issues related to the use of synthetic binders. While many studies have been conducted on the use of FRCM in shear and flexural applications, few were dedicated to confinement of slender columns, particularly those related to finite element (FE) analysis. In this study, a nonlinear three-dimensional FE model has been developed to study the behavior of reinforced concrete (RC) columns confined by (FRCM) jackets, and loaded concentrically and eccentrically. Drucker-Prager (DP) concrete model, which has several improvements over traditional DP models, was used to model the concrete core. Composite failure in the fibers comprising FRCM system and column buckling were also considered in the developed FE model. The model was validated by comparing its predictions with those of three control and 8 FRCM-confined RC columns from literature. Consequently, a parametric study utilizing 96 additional models, was performed on five parameters, namely: cross-sectional shape (square, circle, hexagon, and octagon), and for rectangular columns; aspect (h/b) ranging from 0.5 to 3, at 0.5 increment; slenderness (KL/r) ratio, considering four values, 10, 25, 50, and 75; load eccentricity (e) as a ratio (e/h) to side length (h), varying from 0 to 2.5; and concrete compressive strength (fc), studying three values: 20, 35, and 50 MPa. Effects of these parameters on the column’s maximum load (Pmax) and general behavior, are discussed in details in Section 6 and summarised in the conclusions part. In general, Pmax increased by 0–32% as a result of applying one layer of FRCM jacket, and showed great dependence on the examined parameters.

中文翻译：

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偏心载荷下 FRCM 约束 RC 柱的参数化 3D 有限元分析

摘要 纤维增强水泥基体 (FRCM) 正在成为一种可行的改造和限制技术，以代替纤维增强聚合物 (FRP) 系统，后者存在与使用合成粘合剂有关的许多问题。虽然已经对 FRCM 在剪切和弯曲应用中的使用进行了许多研究，但很少有人专门研究细长柱的约束，特别是与有限元 (FE) 分析相关的那些。在这项研究中，开发了一个非线性三维有限元模型来研究由 (FRCM) 护套约束并同心和偏心加载的钢筋混凝土 (RC) 柱的行为。Drucker-Prager (DP) 混凝土模型比传统的 DP 模型有几处改进，用于对混凝土核心进行建模。在开发的有限元模型中还考虑了包含 FRCM 系统和柱屈曲的纤维中的复合失效。该模型通过将其预测与文献中的三个对照和 8 个 FRCM 限制的 RC 柱的预测进行比较来验证。因此，使用 96 个附加模型对五个参数进行了参数研究，即：横截面形状（正方形、圆形、六边形和八边形）和矩形柱；方面 (h/b) 范围从 0.5 到 3，以 0.5 为增量；细长 (KL/r) 比，考虑四个值，10、25、50 和 75；负载偏心 (e) 与边长 (h) 的比率 (e/h)，从 0 到 2.5；和混凝土抗压强度 (fc)，研究三个值：20、35 和 50 MPa。这些参数对色谱柱最大载荷 (Pmax) 和一般行为的影响，在第 6 节中详细讨论并在结论部分进行了总结。一般来说，由于应用一层 FRCM 护套，Pmax 增加了 0-32%，并且显示出对检查参数的极大依赖性。