NUMERICAL MODELING OF FRP - RETROFITTED CIRCULAR RC COLUMNS INCLUDING SHEAR

Abstract eng:
The Fiber Reinforced Polymer (FRP)-confined concrete model contained in a wellknown Bulletin by the International Federation for Structural Concrete (fib) has been enhanced to take into account the superposition of the confining effects of the already existing steel reinforcement with that of the FRP jacketing applied when retrofitting reinforced concrete (RC) columns. Columns are here modeled with a fiber-based nonlinear beam- column element (with displacement formulation) in which the constitutive law for concrete presented in this paper is implemented. This allows for the immediate incorporation of shear strains (uncoupled from the normal ones) at the material level. The averaged response of the two different regions -concrete core and concrete cover-in the cross-section allows the assignment of a unique stress-strain law for all the fibers/layers of the circular section. Correlation with an experimental study is performed to validate the proposed iterative procedure.

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