Numerical simulation of the de-bonding phenomenon of FRCM strengthening systems (original) (raw)

Numerical simulation of the tensile behavior of FRCM strengthening systems

Composites Part B: Engineering, 2020

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Long-term bond stresses and debonding failure of FRP-strengthened RC cracked members

Composites Part B: Engineering, 2013

Most of the existing models to prevent debonding failure in beams externally strengthened by fiber reinforced polymer (FRP) laminates were developed focusing on the short term response. This paper studies the effect of concrete creep on the interfacial shear stresses and consequently, on the debonding failure load. A simplified formulation for the instantaneous and time-dependent bond stresses under sustained load is provided. Its reliability is analysed through the results obtained by a non-linear time-dependent analysis model. Previously, this model has been checked to evaluate the long-term response of existing experimental programmes in terms of deflections and strains.

Bond Characteristics of Various FRP Strengthening Techniques

Fibre-Reinforced Polymer Reinforcement for Concrete Structures, 2003

Strengthening of reinforced concrete structures using FRP has emerged as a potential solution to the problems associated with civil infrastructure. Many researchers have reported significant increases in strength and stiffness of concrete structures strengthened with FRP. Nevertheless, possible brittle failures of the strengthened system due to delamination of the FRP strips and/or sheets could limit the use of the full efficiency of the FRP system. This paper presents a bond failure hypothesis for near surface mounted FRP bars. Closed-form analytical solutions are proposed to predict the interfacial stresses for near surface mounted FRP strips and externally bonded FRP sheets. The models are calibrated by comparing the predicted behavior to test results. Quantitative criteria governing interfacial debonding failure of near surface mounted FRP bars, strips and externally bonded FRP sheets are established.