Jang Nag-Seop, Kim Young-Hwan, Oh Hong-Seob
Department of Civil Engineering, Gyeongsang National University, Jinju 52725, Republic of Korea.
Materials (Basel). 2023 Jan 9;16(2):621. doi: 10.3390/ma16020621.
FRP (fiber-reinforced polymer)-reinforced concrete members have larger deflection than reinforced concrete members because of the low modulus of elasticity of the FRP bar. In this paper, we proposed a new effective moment of inertia equation to predict the deflection of FRP-reinforced concrete members based on the harmony search algorithm. The harmony search algorithm is used to optimize a function that minimizes the error between the deflection value of the experimental result and the deflection value expected from the specimen's specifications. In the experimental part, four GFRP (Glass Fiber-Reinforced Polymer)- and BFRP (Basalt Fiber-Reinforced Polymer)-reinforced concrete slab specimens were manufactured and tested. FRP-reinforced concrete slabs were reinforced with GFRP and BFRP rebars on spiral rib surfaces. The effects of the FRP reinforcement ratio and balanced reinforcement ratio (ρf/ρfb), the moment of inertia of the transformed cracked section and the gross moment of inertia (Icr/Ig), and the cracking moment and the maximum service load moment (Mcr/Ma) on the effective moment of inertia have been considered. The experimental results and predicted results of the flexural testing of concrete slabs reinforced with FRP rebars were compared, and the experimental results were in good agreement with the calculated values using the proposed effective moment of inertia equation.
由于纤维增强聚合物（FRP）筋的弹性模量较低，FRP增强混凝土构件的挠度比钢筋混凝土构件的挠度大。在本文中，我们基于和声搜索算法提出了一个新的有效惯性矩方程，以预测FRP增强混凝土构件的挠度。和声搜索算法用于优化一个函数，该函数使实验结果的挠度值与根据试件规格预期的挠度值之间的误差最小化。在实验部分，制作并测试了四个玻璃纤维增强聚合物（GFRP）和玄武岩纤维增强聚合物（BFRP）增强混凝土板试件。FRP增强混凝土板在螺旋肋表面用GFRP和BFRP钢筋进行增强。考虑了FRP配筋率和平衡配筋率（ρf/ρfb）、换算开裂截面惯性矩和毛截面惯性矩（Icr/Ig）以及开裂弯矩和最大使用荷载弯矩（Mcr/Ma）对有效惯性矩的影响。比较了FRP筋增强混凝土板的弯曲试验的实验结果和预测结果，实验结果与使用所提出的有效惯性矩方程计算的值吻合良好。
