This paper focuses on evaluating the reliability of several analytical formulations and code provisions in estimating the deformation capacity of both unconfined and FRP (fibre reinforced polymers) confined reinforced concrete (r/c) columns. At this purpose some results of monotonic and cyclic experimental tests conducted at the Laboratory of Structural Engineering of the University of Salerno on full scale square r/c columns have been considered. Studied columns were realized with a low compression strength concrete and were reinforced by using both smooth and deformed steel rebars; the reinforcement details (i.e. lap splice lengths, anchorages, hoop spaces, etc.) were arranged following design rules used in the past. Some of the tested columns were unstrengthened; the others were strengthened by means of glass (GFRP) or carbon (CFRP) confinement systems. The experimental ultimate drifts have been compared with the ultimate chord rotations estimated by using some formulations available in the technical literature and in the international codes; the comparison between numerical and test results has allowed to individuate the most reliable models. The paper shows that the deformation capacity of FRP confined members is well estimated by using the mechanics formulation provided by both the Eurocode 8 (EC8) and the guidelines recently edited by the Italian National Research Council (CNR).

On the Available Ductility of R/C Columns Strengthened with FRP Systems: Experimental vs Numerical Evaluation

FAELLA, Ciro;NAPOLI, ANNALISA;REALFONZO, ROBERTO;RIZZANO, Gianvittorio
2007-01-01

Abstract

This paper focuses on evaluating the reliability of several analytical formulations and code provisions in estimating the deformation capacity of both unconfined and FRP (fibre reinforced polymers) confined reinforced concrete (r/c) columns. At this purpose some results of monotonic and cyclic experimental tests conducted at the Laboratory of Structural Engineering of the University of Salerno on full scale square r/c columns have been considered. Studied columns were realized with a low compression strength concrete and were reinforced by using both smooth and deformed steel rebars; the reinforcement details (i.e. lap splice lengths, anchorages, hoop spaces, etc.) were arranged following design rules used in the past. Some of the tested columns were unstrengthened; the others were strengthened by means of glass (GFRP) or carbon (CFRP) confinement systems. The experimental ultimate drifts have been compared with the ultimate chord rotations estimated by using some formulations available in the technical literature and in the international codes; the comparison between numerical and test results has allowed to individuate the most reliable models. The paper shows that the deformation capacity of FRP confined members is well estimated by using the mechanics formulation provided by both the Eurocode 8 (EC8) and the guidelines recently edited by the Italian National Research Council (CNR).
2007
9789608969100
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11386/2280956
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