Abstract
An analytical study to predict the tension force of stirrups in concrete beams that are longitudinally reinforced with Carbon Fibre Reinforced Polymers (CFRP) bars was carried out. Modified Compression Field Theory (MCFT) was applied in this study and a computer program was developed to facilitate the calculation process. The analytical results were compared with empirical formula and test data adopted from experimental study. Three concrete beams longitudinally reinforced with CFRP bars and transversely reinforced with steel bars were tested. Stirrups spacing was used as test variable. The beams were tested until failure and strains on the stirrups measured. The comparison between test results and the MCFT results shows that MCFT predicts the growth of tension force in stirrups well.
Highlights
In the last thirty years, the use of Fiber Reinforced Polymers (FRP) as a substitute for steel for longitudinal bars has become increasingly popular due to its high tensile strength and resistance to corrosion
One of the analytical methods that can be used to predict the tensile stress in a stirrup is Modified Compression Field Theory (MCFT) [1]
This deviation of measured results is shown for predicted values calculated using Eq (7). This result indicates that the accuracy of both MCFT and Eq (7) in predicting the tensile force on stirrups strongly depends on the stirrups ratio in the shear span zone
Summary
In the last thirty years, the use of Fiber Reinforced Polymers (FRP) as a substitute for steel for longitudinal bars has become increasingly popular due to its high tensile strength and resistance to corrosion. Shear failure occurs before the flexural capacity of the structural members is reached and leads to reduced structural ductility due to a sudden collapse. Due to this fact, a careful design procedure is needed so reinforced concrete members are able to withstand the shear forces. One of the analytical methods that can be used to predict the tensile stress in a stirrup is Modified Compression Field Theory (MCFT) [1]. This method uses equilibrium equations, compatibility, and stress-strain relationships to predict the relationship between shear forces and deformations. Theoretical predictions based on MCFT were compared to test data and the previously developed empirical formula
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