Abstract
The near surface mounted (NSM) method of inserting fiber reinforced polymer (FRP) elements (rods or lamina) into notches has been shown to be a good way for restoring reinforced concrete (RC) elements. The knowledge about the use of Glass-FRP rod following the NSM to reinforce RC beams is limited. This paper deals with the analysis of static and dynamic behaviour of RC beams with and without strengthening. The response of RC beams was assessed at different concrete’s damage level by non-destructive vibration tests. First, a couple of beams have been analysed: one RC beam subjected to bending and under vibration tests; another one beam, damaged by bending and strengthened with NSM Carbon-FRP rods tested again under vibration. Further, one RC beam damage was analysed under bending and vibration tests without strengthening; successively, the beam model with NSM GFRP rod has been tested following the same loading path. Below experimental results are shown and commented; in particular, changes in frequency values are related to the evolution of damage level affected RC beams with NSM CFRP and GFRP rods.
Highlights
The near surface mounted (NSM) technique for the strengthening of reinforced concrete (RC) elements foresees grooves along the concrete cover where the fibre reinforced polymer (FRP) rods are glued with the use of mortar or epoxy resin.R
Experimental results are shown and commented; in particular, changes in frequency values are related to the evolution of damage level affected RC beams with NSM CFRP and GFRP rods
Few experimental researches deal with investigating the behaviour of RC beams strengthened with NSM fiber reinforced polymer (FRP) elements made by different composite materials [19,20,21,22] and the assessment of strengthened RC beams with NSM FRP rods with non-destructive free vibration tests [23,24]
Summary
The near surface mounted (NSM) technique for the strengthening of reinforced concrete (RC) elements foresees grooves along the concrete cover where the fibre reinforced polymer (FRP) rods are glued with the use of mortar or epoxy resin. Few experimental researches deal with investigating the behaviour of RC beams strengthened with NSM FRP elements made by different composite materials [19,20,21,22] and the assessment of strengthened RC beams with NSM FRP rods with non-destructive free vibration tests [23,24]. The response of RC beams has been assessed through non-destructive vibration monitoring at different level of damage due to concrete cracking or decrease of bond of FRP rods. The behaviour of RC beams with and without FRP NSM strengthening was assessed through four points bending tests, where the two supports and the two loading points were placed, respectively, at 1500 mm and 300 mm form the centerline.
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