This paper aims at investigating the cyclic response of FRP strips glued to concrete subjected low-cycle fatigue actions, such as those induced by earthquake events. The study starts from a theoretical model capable to simulate the mechanical response of the aforementioned FRP-To-concrete joints. The model is formulated within the general theoretical framework of fracture mechanics under the assumption that debonding occurs as a pure mode II cracking process throughout a zero-Thickness interface between the FRP strip and the concrete substrate. Under the conceptual standpoint, the model proceeds as an incremental analysis and the debonding phenomenon is simulated as a propagating fracture whose local residual stress is described by the decreasing branch of the bond-slip law. Isotropic softening behavior is assumed in the local response of the interface under cyclic loads. A further extension of the interface model is also proposed for taking into account rate-dependent effects by following a classical overstress viscoplastic approach available in the literature. The mechanical response of FRP strips glued to concrete and subjected to cyclic actions is firstly investigated by considering different values of the relevant structural parameters and various cyclic loading protocols characterized by average force levels and load amplitudes. Then, the numerical examples consider the visco-plastic behavior of fiber-reinforced polymer sheets glued on concrete substrates under different strain rates by comparing experimental data against the proposed numerical simulations.

Numerical simulation of the cyclic response of FRP strips glued to concrete

Caggiano A.
2017-01-01

Abstract

This paper aims at investigating the cyclic response of FRP strips glued to concrete subjected low-cycle fatigue actions, such as those induced by earthquake events. The study starts from a theoretical model capable to simulate the mechanical response of the aforementioned FRP-To-concrete joints. The model is formulated within the general theoretical framework of fracture mechanics under the assumption that debonding occurs as a pure mode II cracking process throughout a zero-Thickness interface between the FRP strip and the concrete substrate. Under the conceptual standpoint, the model proceeds as an incremental analysis and the debonding phenomenon is simulated as a propagating fracture whose local residual stress is described by the decreasing branch of the bond-slip law. Isotropic softening behavior is assumed in the local response of the interface under cyclic loads. A further extension of the interface model is also proposed for taking into account rate-dependent effects by following a classical overstress viscoplastic approach available in the literature. The mechanical response of FRP strips glued to concrete and subjected to cyclic actions is firstly investigated by considering different values of the relevant structural parameters and various cyclic loading protocols characterized by average force levels and load amplitudes. Then, the numerical examples consider the visco-plastic behavior of fiber-reinforced polymer sheets glued on concrete substrates under different strain rates by comparing experimental data against the proposed numerical simulations.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/1076277
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