1,721,023 research outputs found
Damage in domains and interfaces: a coupled predictive theory
No full textIn this study, we propose a model coupling damage of domains and damage of interfaces. A predictive
theory of continuum damage mechanics is developed within the framework of the principle of virtual
power. Because damage results from microscopic motions, the power of these microscopic motions is
included in the power of the internal forces. The power of the internal forces we choose depends on
the damage velocity and on its gradient to take into account local interactions. An interaction between
the domain damage and the damage along the interface is introduced. To overcome the insensitivity of
the local interface model to elongation, nonlocal elongation has been considered as a source of damage.
Representative numerical examples confirm that our proposed model can be used to describe various
damage phenomena in agreement with experiments
Statistical assessment of a design formula for the debonding resistance of FRP reinforcements externally glued on masonry units
No full textMechanics of Masonry Structures Strengthened with Composite Materials
No full textThe present contribution statistically assesses a design procedure to estimate the bond resistance of composite fabrics externally glued on clay brick masonry substrates. Based on recent experimental campaigns a database of bond test results between fiber reinforced polymer and clay bricks is collected and an alternative formula is proposed starting from theoretical and experimental evidence. Then, its characteristic value is evaluated following the "Design Assisted by Testing Approach" suggested in the Eurocode 0. The capabilities of the proposed method are statistically evaluated and the advantages with respect to existing formulas are discussed
An interphase model for the analysis of the masonry-FRP bond
No full textThe present paper deals with the problem of the detachment of fiber reinforced polymer (FRP) from a masonry support. In particular, a new interphase model simulating the mechanical bond between masonry and FRP is proposed. It is obtained as a system of two interfaces: one reproduces the response of the glue and of the skin-deep layer and it is characterized by a linear elastic behavior whereas the second describes the nonlinear response of the detachment layer. The effect of the possible confinement due to the stress components acting in the plane of the detachment layer is also considered. Two numerical applications are reported. The first illustrates a comparison between the experimental laboratory tests and numerical simulations, showing the good performances of the proposed model. The second application is specifically devoted to the investigation of the effects of the presence of mortar joints in the detachment mechanism
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