The problem of upgrading buildings presenting static deficiencies or of repairing structures damaged on the occasion of seismic events, has determined in recent years a growing interest among scientific community and structural engineers towards fiber reinforced composite materials (FRPs). That is confirmed by the several practical applications on different structural types and by issuing of specific technical guidelines in many countries. Concerning the problem of repairing damaged buildings, it is known that columns belonging to RC frames are particularly sensitive to seismic actions and that they suffer more or less severe damage even for hearthquakes having a medium-low intensity. Besides, it is likely that the suffered damage is quite different at column ends, therefore the repair intervention may be executed using unequal reinforcing systems at the damaged portions of the element; in this case, if a new earthquake occurs, the repaired structure may experience an unexpected behaviour due to the asymmetry of the repair work. Based on these remarks, an experimental program has been initiated at the Department of Constructions of the University of Florence, aimed at investigating the cyclic response of RC specimens previously damaged and then repaired by carbon fiber composites (CFRPs). The whole program planned to test ten specimens, conceived according to the following key parameters: 1) level of initial damage; 2) type of repair system; 3) intensity of axial load. Amount of traditional steel reinforcement as well as mechanical properties of materials have been kept constant. In this study, preliminary results of the investigation are presented. They involved six specimens; two of them have been tested without any external reinforcement in order to represent a useful reference for response of repaired specimens.

Experimental behaviour of asymmetrically damaged RC columns repaired by CFRP / R. Nudo; F. Capani. - ELETTRONICO. - (2007), pp. 00-00. (Intervento presentato al convegno Eighth International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures FRPRCS'08 tenutosi a Patras, Greece nel July 2007).

Experimental behaviour of asymmetrically damaged RC columns repaired by CFRP

NUDO, RAFFAELE;
2007

Abstract

The problem of upgrading buildings presenting static deficiencies or of repairing structures damaged on the occasion of seismic events, has determined in recent years a growing interest among scientific community and structural engineers towards fiber reinforced composite materials (FRPs). That is confirmed by the several practical applications on different structural types and by issuing of specific technical guidelines in many countries. Concerning the problem of repairing damaged buildings, it is known that columns belonging to RC frames are particularly sensitive to seismic actions and that they suffer more or less severe damage even for hearthquakes having a medium-low intensity. Besides, it is likely that the suffered damage is quite different at column ends, therefore the repair intervention may be executed using unequal reinforcing systems at the damaged portions of the element; in this case, if a new earthquake occurs, the repaired structure may experience an unexpected behaviour due to the asymmetry of the repair work. Based on these remarks, an experimental program has been initiated at the Department of Constructions of the University of Florence, aimed at investigating the cyclic response of RC specimens previously damaged and then repaired by carbon fiber composites (CFRPs). The whole program planned to test ten specimens, conceived according to the following key parameters: 1) level of initial damage; 2) type of repair system; 3) intensity of axial load. Amount of traditional steel reinforcement as well as mechanical properties of materials have been kept constant. In this study, preliminary results of the investigation are presented. They involved six specimens; two of them have been tested without any external reinforcement in order to represent a useful reference for response of repaired specimens.
2007
Eighth International Symposium on Fiber Reinforced Polymer Reinforcement for Concrete Structures FRPRCS'08
Patras, Greece
July 2007
R. Nudo; F. Capani
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Utilizza questo identificatore per citare o creare un link a questa risorsa: https://hdl.handle.net/2158/360200
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