Encontrados 13 documentos, a visualizar página 1 de 2
Durability analysis of bond between composite materials and masonry substrates
Ghiassi, BahmanTese de doutoramento em Engenharia Civil ; In recent years, composites materials have been increasingly accepted as effective strengthening technique for civil engineering structures, particularly in the case of reinforced concrete. The reliability of this technique, when externally applied, depends on the long-term bond behavior between these materials and the masonry substrate, but research in this area is s...
Assessment of the bond quality degradation in FRP-strengthened masonry using IR...
Ghiassi, Bahman; Silva, Sandra Monteiro; Oliveira, Daniel V.; Lourenço, Paulo B.; Bragança, L.The FRP-to-masonry bond behavior in externally bonded reinforced masonry structures is the main mechanism in controlling the effectiveness of this technique. Therefore, monitoring the quality of bond during the service life of the structure is of crucial importance for structural health evaluation. The bond quality may be affected due to environmental conditions which results in local detachments at the FRP/sub...
Experimental investigation on the long-term durability of bond between FRP and ...
Ghiassi, Bahman; Oliveira, Daniel V.; Lourenço, Paulo B.The characterization of long-term behavior of bond between Fiber-Reinforced Polymers (FRPs) and masonry substrates in a service environment is a crucial issue for design purposes, which requires a full body of experimental and theoretical information. Most of the research in this area has been devoted to FRP-concrete specimens, and the available data for FRP-strengthened masonry components are still lacking. Th...
Recent developments in durability of FRP-masonry systems
Ghiassi, Bahman; Oliveira, Daniel V.; Lourenço, Paulo B.Fiber reinforced polymers (FRPs) are being more and more used for external strengthening of masonry structures. Therefore, characterization of the short and long-term behavior of bond between FRP composites and masonry substrates in a service environment is crucial for design purposes. A full body of experimental and theoretical investigations is required for durability assessment of FRP strengthened structures...
Water degrading effects on the bond behavior in FRP-strengthened masonry
Ghiassi, Bahman; Marcari, Giancarlo; Oliveira, Daniel V.; Lourenço, Paulo B.Fiber reinforced polymers are being extensively used for external strengthening of masonry structures. However, durability of this strengthening technique under environmental conditions is still under inves- tigation. Previous studies indicate that moisture plays an important role in the durability of bond between FRP and substrate. Moisture can cause degradation in the bond behavior and also in the mechan- ica...
Application of digital image correlation in investigating the bond between FRP ...
Ghiassi, Bahman; Xavier, José; Oliveira, Daniel V.; Lourenço, Paulo B.Full characterization of the bond behavior between Fiber Reinforced Polymers (FRPs) and masonry in externally bonded reinforcement (EBR) technique is crucial at the design stage or structural performance prediction. In this regard, a full-field assessment technique seems to be valuable for an adequate characterization of the bond behavior. The digital image correlation (DIC) and feature tracking techniques have...
Numerical analysis of bond behaviour between masonry bricks and composite mater...
Ghiassi, Bahman; Marcari, Giancarlo; Oliveira, Daniel V.; Lourenço, Paulo B.Fiber Reinforced Polymers have become a popular material for external strengthening of masonry structures. The performance of this strengthening technique is strongly dependent on the bond between FRP and substrate. This paper presents numerical modeling of the bond behavior in FRP-strengthened masonry components using interface elements, based on a recent testing program at the University of Minho. A trilinear...
Numerical study of the role of mortar joints in the bond behavior of FRP-streng...
Ghiassi, Bahman; Oliveira, Daniel V.; Lourenço, Paulo B.; Marcari, GiancarloThe performance of the interface between FRP and masonry is one of the key factors affecting the behavior of strengthened masonry elements. Therefore, a sound understanding of the interface behavior is crucial at the design stage. In this paper, the effect of mortar joints in the bond behavior of FRP-strengthened masonry prisms is investigated through numerical modeling. The numerical simulation is performed by...
A simplified model for analysis of unreinforced masonry shear walls under combi...
Ghiassi, Bahman; Soltani, Masoud; Tasnimi, Abbas AliA macro computational model is presented in this study for simulating the nonlinear static behavior of masonry walls. The adopted strategy is based on modeling the nonlinear behavior of masonry elements considering it as an orthotropic material and then extending it with a simple method to masonry walls. The model is capable of considering shear and flexural deformations in the global behavior. It can also pred...
Seismic evaluation of masonry structures strengthened with reinforced concrete ...
Ghiassi, Bahman; Soltani, Masoud; Tasnimi, Abbas AliCoating the walls with reinforced concrete layers is a conventional method of strengthening masonry structures in Iran. However, due to the lack of analytical and experimental information about the behavior of strengthened masonry wall with this method, the design of these walls is generally conducted based on empirical relations and decisions which may result in uneconomical or under-designed strengthening det...
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