Stress-strain model for FRP-confined concrete columns under cyclic and seismic loading

C. Desprez (1) , J. Mazars (2) , Panagiotis Kotronis (3) , P. Paultre (4)

1 IFSTTAR/MAST/EMGCU - Expérimentation et modélisation pour le génie civil et urbain
2 3SR - Laboratoire sols, solides, structures - risques [Grenoble]
3 GeM - Institut de Recherche en Génie Civil et Mécanique
4 UdeS - Université de Sherbrooke

In structural engineering, seismic vulnerability reduction of existing structures is a crucial issue. External reinforcement with fiber-reinforced polymer (FRP) holds interest in achieving this aim. Its use as a retrofitting method is limited, however, for a number of reasons, including the lack of numerical tools for predicting cyclic loading. This paper presents a simplified stress-strain model suitable for monotonic and cycling loading capable of predicting the FRP's effect on reinforced-concrete col umns. The model is inspired by two well-known concrete constitutive laws: one based on damage mechanics (La Borderie's concrete-damage model, 1991); the other on extensive experimental studies (Eid & Paultre's confined-concrete model, 2008). Validation is provided using experimental results on reinforced concrete columns subjected to axial and flexural cyclic loading. All the simulations were conducted with multifiber Timoshenko beam elements.

Mots clés: FRP; Confined-concrete; Stress-strain model; Multifiber beam; Cyclic loading

Domaines: Dynamique, vibrations; Structures

C. Desprez, J. Mazars, Panagiotis Kotronis, P. Paultre. Stress-strain model for FRP-confined concrete columns under cyclic and seismic loading. 15th World Conference on Earthquake Engineering (15WCEE), Sep 2012, Lisbonne, Portugal. pp.6656-6664. ⟨hal-01008965⟩