Effective Moment of Inertia Prediction of FRP-Reinforced Concrete Beams Based on Experimental Results

Abstract

Concrete beams reinforced with glass-fiber reinforced polymer (GFRP) bars exhibit large deflections in comparison with steel-reinforced concrete beams because of the low modulus of elasticity of GFRP bars. This paper proposes new equations for estimating the effective moment of inertia of FRP-reinforced concrete beams on the basis of the genetic algorithm and experimental results. Genetic algorithm is used to optimize the error function between experimental and analytical responses. In the experimental part of the study, nine beam specimens were manufactured and tested. In addition, the results of 55 beam specimens tested by other researchers were also used. The effects of elastic modulus of FRP bars, reinforcement ratio, and the level of loading on the effective moment of inertia are taken into account. The proposed equations are compared with different code provisions and previous models for predicting the deflection of FRP-reinforced concrete beams. The values calculated using the proposed equations are also compared with different test results. The experimental results correlated well with the values predicted using the proposed equations, especially in the cases of high reinforcement ratios and high levels of loading.

Evaluation of the flexural strength and serviceability of geopolymer concrete beams reinforced with glass-fibre-reinforced polymer (GFRP) bars

“…First, FRP-RC beams exhibit lower serviceability performance owing to the lower modulus of elasticity of FRP bars compared to steel bars [11][12][13]. Secondly, FRP-RC beams are usually designed as over-reinforced because concrete crushing failure is less brittle and less catastrophic compared to FRP rupture failure owing to the rigid and brittle behaviour of FRP bars.…”

Prediction of effective moment of inertia for hybrid FRP-steel reinforced concrete beams using the genetic algorithm

“…Similar to Bransonʼ s equation, the equations that were proposed by Mousavi et al (2012) [24], the effective moment of inertia, can be calculated using Equations as follows.…”

Flexural Response of RC beams cast with normal and steel fibre concrete internally reinforced with various types of FRP bars

“…Moreover, Bischoff and Gross [28,29] demonstrated that a sudden loss of stiffness at cracking affected the deflection and post-cracking behaviour. Mousavi et al [30] investigated deflection of GFRP-RC beams, and alleged that the low elastic modulus (E) of GFRP bars causes sudden loss of concrete stiffness. In addition, the bond coefficient and elastic modulus (E) of FRP were the main factors manipulating the GFRP-RC beam behaviour.…”