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Article

Open Access

Mechanical Response of the Composite Material—Concrete Interface in FRP-Strengthened Concrete Elements: Finite Element Simulation

Author(s)

Todor Zhelyazov

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DOI:10.17265/2159-5275/2018.01.005

Affiliation(s)

Faculty of Transport, Department of Mechanics, Technical University of Sofia, 8, Kliment Ohridski blvd, Sofia 1000, Bulgaria

ABSTRACT

In structural elements strengthened with Fiber Reinforced Polymer (FRP), debonding failure modes should be taken into consideration. Under specific circumstances, they may provoke a global, premature failure of the structural element. In other cases, they should be accounted for in the modeling in order to obtain more accurate results. Despite the large amount of research work carried out in this field in the last few decades, debonding failure modes are still not fully understood. This contribution is focused on a numerical procedure designed to model the progressive loss of bond action between FRP and concrete. The two-stage procedure is integrated into incremental, finite element analysis. The proposed algorithm uses experimentally obtained slip-stress relationship. Predefined failure criteria are used to predict the local bond failure. In the reported case study, an experimental set-up widely employed to investigate debonding is modeled. Results obtained by finite element analysis are discussed.

KEYWORDS

FRP-concrete interface, debonding, finite element analysis and simulation.

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