Issue 58

R. Capozucca et alii, Frattura ed Integrità Strutturale, 58 (2021) 386-401; DOI: 10.3221/IGF-ESIS.58.28

Figure 15: Frequency value variations in percent for the first four modes (beam B2 without strengthening).

Figure 16: Frequency value variations in percent for the first four modes (beam B2 with NSM GFRP rod).

C ONCLUSION his paper describes an investigation on RC beams strengthened with NSM CFRP and GFRP rods. The investigation foresaw both static and free vibration tests. The main results of the experimental campaign are as follows:  Excellent behavior of the strengthened beams both with NSM CFRP and NSM GFRP rods in terms of maintaining adherence without exhibiting loss of bond or damage before the collapse of compressive concrete;  The presence of the NSM strengthening both with NSM CFRP and NSM GFRP rods acts by reducing the width of the cracks even for high entity of load;  The analysis of experimental frequencies is an adequate NDM to monitor RC beams with reinforcement or with strengthening by FRP rods. T

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