Abstract
The numerical behaviors of fiber reinforced polymer (FRP) bar reinforced concrete beams using three non-linear finite element models are compared with the recorded data. First approach is based on strain decomposition into elastic and crack strain and is capable of simulating multiple non-orthogonal cracks. The remaining two approaches are based on the total strain crack model and include a rotating crack model (RCM) and an orthogonal fixed crack model (FCM). The analysis is carried out with the help of 2D-isoparametric plane-stress elements. Compression softening and tension stiffening effects of cracked concrete are considered. Tension reinforcement consists of either steel or FRP bars. The accuracy of the models has been discussed with reference to the authors’ tests as well as various studies reported in the literature. Both RCM and orthogonal FCM models showed good agreement with the recorded data which was also found consistent with every type of FRP bar.
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Abbreviations
- A f :
-
Area of FRP bars
- b :
-
Width of section
- h :
-
Height of section
- E cr :
-
Crack normal stiffness
- f c :
-
Ultimate compressive strength
- f ct :
-
Concrete tensile strength
- f cu :
-
Cube compressive strength
- σ:
-
Stress corresponding to strain ε
- εcon :
-
Elastic concrete strain
- εcr :
-
Crack strain
- εt :
-
Ultimate tensile strain corresponding to f ct
- εo :
-
Ultimate compressive strain corresponding to f c
- μ:
-
Factor to take tension stiffening of concrete into account. It gradually decreases from 1 to 0 as a function of crack normal strain (ε cr n ) [Fig. 2]
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Acknowledgment
The authors wish to acknowledge the support provided for this research by the School of Built Environment, University of Ulster.
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Rafi, M.M., Nadjai, A. Comparison of numerical behaviors of FRP reinforced concrete beams using three smeared crack models. Mater Struct 45, 93–106 (2012). https://doi.org/10.1617/s11527-011-9753-6
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DOI: https://doi.org/10.1617/s11527-011-9753-6