This study presents a numerical modeling procedure for the pullout of FRP bar from concrete cylinder, when the bond failure of concrete/FRP occurs mainly within the bar surface. From the governing equation of bond-slip, the normal force along the bar is defined in terms of a local bond stress-slip law and the relative displacement between concrete and bar surface. A shear stress-slip relationship that was successfully used for interface between concrete and externally bonded FRP sheet is modified and adopted as the local bond stress-slip law for FRP bar in concrete. Then values of parameters in that expression are determined by minimizing the difference between bond-slip (normal force vs. slip at the loaded end of the bar) from the analytical method and experimental result. Finite element analysis is also carried out to model the bond-slip of bar in concrete. The interaction between FRP bar and concrete is defined using a nonlinear spring element. The force-deflection curve of the spring element is determined by the local bond stress-slip law. With the proposed procedure, the local bond stress-slip law can be quickly determined, avoiding tedious computations, and the development length for FRP bar can be easily obtained.
Numerical Modeling for the Interface Bond of Concrete and FRP Bar
11th Biennial ASCE Aerospace Division International Conference on Engineering, Science, Construction, and Operations in Challenging Environments ; 2008 ; Long Beach, California, United States
Earth & Space 2008 ; 1-11
2008-09-04
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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