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The present study deals with the long-term behavior of fiberreinforced polymer (FRP) materials in civil engineering. More\ud specifically, the authors propose a mechanical model capable of\ud predicting the viscoelastic behavior of FRP laminates in the field\ud of linear viscoelasticity, starting from that of the matrix material\ud and fiber. The model is closely connected with the low FRP stress\ud levels in civil engineering applications. The model is based on a\ud micromechanical approach which assumes that there is a perfect\ud adhesion between the matrix and fiber. The long-term behavior of\ud the phases is described through a four-parameter rheological law.\ud A validation of the model has also been developed by matching\ud the predicted behavior with an experimental one available in the\ud literature

No abstract

In addition toFibre-Reinfocedcomposite materials, which are made of long glass/carbon/aramid fibers embedded in a polymer matrix (FRP), the use ofFRCMcomposites (Fabric-Reinforced Cementitious Matrix) is becoming more and more widespread. As far as this specific case, the inorganic matrix guarantees many advantages, especially when dealing with masonry substrates, including a good compatibility from both a physical and a chemical point of view and the possibility of wet lay-up application. Despite their wide use in technical applications, the constitutive behavior and the failure mechanisms of FRCMs have not been adequately studied. As a consequence, a final assessment upon which criteria have to be used for verification and qualification ofFRCMsis still missing. In the context of a recent experimental program-still under development-cooperated by many Italian academic laboratories, that is aimed at detecting the main features of the constitutive behavior of these materials, a discussion seems to be appropriate on the initial experimental results obtained at Salerno University on manyFRCMspecimens tested under uniaxial tensile loads.