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Assessment of RC beams with NSM CFRP rectangular rods damaged by notches
The near surface mounted (NSM) technique using fiber reinforced polymer (FRP) rods inserted into grooves has been shown to be a suitable method in the strengthening of reinforced concrete (RC) beams. Availability of this strengthening is due to both perfect bond between concrete-resin-FRP rod, guaranteed by correct execution, and to the use of flawless FRP rods. This paper investigates the static and dynamic response of undamaged RC beams strengthened with NSM carbon-FRP rectangular rods as well as the behaviour of damaged ones, where damage was due to notches on their CFRP rods. The assessment of the beams was carried out by analyzing the free vibrations of three RC beam models: one of which was strengthened using an undamaged rectangular CFRP rod and two beams with double notches in one or two sections. Each beam was subjected to increasing bending loading at different steps of damage degree and tested dynamically in both the un-cracked concrete state, and after every step of loading. Changes of natural frequency values evaluated by frequency response functions (FRFs) envelope are related to the damage degree of RC beams with a NSM CFRP rectangular rod. Theoretical frequency values are compared with those obtained through tests and discussed.
Assessment of RC beams with NSM CFRP rectangular rods damaged by notches
The near surface mounted (NSM) technique using fiber reinforced polymer (FRP) rods inserted into grooves has been shown to be a suitable method in the strengthening of reinforced concrete (RC) beams. Availability of this strengthening is due to both perfect bond between concrete-resin-FRP rod, guaranteed by correct execution, and to the use of flawless FRP rods. This paper investigates the static and dynamic response of undamaged RC beams strengthened with NSM carbon-FRP rectangular rods as well as the behaviour of damaged ones, where damage was due to notches on their CFRP rods. The assessment of the beams was carried out by analyzing the free vibrations of three RC beam models: one of which was strengthened using an undamaged rectangular CFRP rod and two beams with double notches in one or two sections. Each beam was subjected to increasing bending loading at different steps of damage degree and tested dynamically in both the un-cracked concrete state, and after every step of loading. Changes of natural frequency values evaluated by frequency response functions (FRFs) envelope are related to the damage degree of RC beams with a NSM CFRP rectangular rod. Theoretical frequency values are compared with those obtained through tests and discussed.
Assessment of RC beams with NSM CFRP rectangular rods damaged by notches
Capozucca, R. (author) / Bossoletti, S. (author) / Montecchiani, S. (author)
Composite Structures ; 128 ; 322-341
2015
20 Seiten, 26 Quellen
Article (Journal)
English
| British Library Online Contents | 2016
| British Library Online Contents | 2016
| British Library Online Contents | 2016
Static and free vibration analysis of RC beams with NSM CFRP rectangular rods
| Tema Archive | 2014