Damage model for FRP-confined concrete columns under cyclic loading

DESPREZ ; MAZARS ; KOTRONIS ; PAULTRE

Type de document
ARTICLE A COMITE DE LECTURE REPERTORIE DANS BDI (ACL)
Langue
anglais
Auteur
DESPREZ ; MAZARS ; KOTRONIS ; PAULTRE
Résumé / Abstract
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.
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