Investigation of tension stiffening effect in fiber concrete beam reinforced with FRP bars based on macroscopic model

doi:10.19936/j.cnki.2096-8000.20230228.009

Abstract

Abstract: Adding fiber in concrete can effectively decrease the crack width of FRP reinforced concrete beams and improve the ductility of the beams. In this study, combined with the tensile constitutive relation of fiber reinforced concrete, a weakening coefficient was introduced to describe the stiffness of fiber reinforced concrete after cracking, and a three-dimensional finite element model was established to reflect the tension stiffening effect of fiber reinforced concrete beam reinforced with FRP bars. The simulated load-displacement curves were consistent with the experimental results under different fiber contents and different reinforcement ratios. In addition, the crack patterns obtained by the finite element analysis were in good agreement with the experimental results. With the decrease of the weakening coefficient, the crack propagation slows down, the number of cracks increases and the width decreases under the ultimate load. The study also shows that the weakening coefficient decreases linearly with the increase of the characteristic parameter of fiber content, and the slope was weakly affected by the reinforcement ratio, while the intercept was significantly affected by the reinforcement ratio.

Key words: FRP bars, fiber reinforced concrete beams, tension stiffening, finite element, weakening coefficient

CLC Number:

TB332

AN Ru, LI Yuankang, CHEN Guoxiong, FU Shihua. Investigation of tension stiffening effect in fiber concrete beam reinforced with FRP bars based on macroscopic model[J]. COMPOSITES SCIENCE AND ENGINEERING, 2023, 0(2): 67-74.

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