Abstract
This article presents an analytical model, based on a refinement of the rotating-angle softened truss model (RA-STM) with efficient solution procedure, to predict the full response of reinforced concrete (RC) membrane elements strengthened with fiber reinforced polymers (FRP). To extend the RA-STM, equations from equilibrium conditions and smeared constitutive relationships for the materials are modified in order to account for the tensile FRP reinforcement and its interactions with the other material components. In addition, an efficient algorithm is proposed for the calculation procedure to avoid using the classical trial and error technique to compute the solution points. This new algorithm provides higher numerical efficiency and stability. The reliability of the efficient RA-STM FRP solution procedure is checked against some experimental data related with FRP-strengthened RC panels tested under in-plane shear and found in the literature, and also with the predictions from the softened membrane model (SMM-FRP) for comparison. In general, reasonably good agreement is observed between the efficient RA-STM FRP procedure and the SMM-FRP, and also with the experimental response of the reference test panels.
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