Korentz Jacek, Czarnecki Witold
Institute of Civil Engineering, University of Zielona Góra, Prof. Z. Szafrana 1, 65-516 Zielona Góra, Poland.
Polymers (Basel). 2023 Feb 25;15(5):1161. doi: 10.3390/polym15051161.
FRP bars are used in concrete structures as an alternative to steel bars as they have many advantages such as high tensile strength, high strength-to-weight ratio, electromagnetic neutrality, lightweight and no corrosion. There is a perceived lack of standard regulations for the design of concrete columns with FRP reinforcement, e.g., in Eurocode 2. This paper describes a procedure for predicting the bearing capacity of concrete columns with FRP reinforcement based on the interaction of axial force and bending moment, which was developed on the basis of existing design recommendations and standards. It was shown that the bearing capacity of eccentrically loaded RC sections depends on two parameters, which are the mechanical reinforcement ratio ω and the location of the reinforcement in the cross-section expressed by the β factor. The analyses carried out showed the existence of a singularity in the n-m interaction curve indicating the fact that in a certain loaded range, the curve is concave, and more it was shown that the balance failure point for sections with FRP reinforcement takes place for eccentric tension. A simple procedure for calculating the required reinforcement from any FRP bars in concrete columns was also proposed. Nomograms developed from n-m interaction curves provide for the accurate and rational design of FRP reinforcement in columns.
纤维增强塑料（FRP）筋用于混凝土结构中作为钢筋的替代品，因为它们具有许多优点，如高抗拉强度、高强度重量比、电磁中性、轻质且无腐蚀。人们认为对于采用FRP加固的混凝土柱设计缺乏标准规范，例如在欧洲规范2中。本文描述了一种基于轴向力和弯矩相互作用来预测FRP加固混凝土柱承载力的方法，该方法是在现有设计建议和标准的基础上开发的。结果表明，偏心受压钢筋混凝土截面的承载力取决于两个参数，即机械配筋率ω和由β因子表示的截面中钢筋的位置。所进行的分析表明，n-m相互作用曲线中存在一个奇点，这表明在一定的加载范围内，曲线是凹的，并且还表明FRP加固截面的平衡破坏点发生在偏心受拉时。还提出了一种从混凝土柱中的任何FRP筋计算所需配筋的简单方法。根据n-m相互作用曲线绘制的诺模图为柱中FRP配筋的准确合理设计提供了依据。
