Damage model for FRP-confined concrete columns under cyclic loading

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

1 IFSTTAR/MAST/SDOA - Sécurité et Durabilité des Ouvrages d'Art
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 columns. The model was 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 and Paultre's confined-concrete model, 2008). Validation is provided using experimental results on reinforced concrete columns subjected to axial and flexural cyclic loading. The proposed approach also deals with steel-bar rupture, considering low-cycle fatigue effects. All the simulations were conducted with multifiber Timoshenko beam elements.

Domaines: Mécanique [physics.med-ph]; Matériaux

C. Desprez, J. Mazars, Panagiotis Kotronis, P. Paultre. Damage model for FRP-confined concrete columns under cyclic loading. Engineering Structures, 2013, 48, pp.519-531. ⟨10.1016/j.engstruct.2012.09.019⟩. ⟨hal-01006716⟩