FRP-masonry interfacial debonding: An energy balance approach to determine the influence of the mortar joints

Experimental investigation on cyclic response of RC elements repaired by CFRP external reinforcing systems

“…The issues of upgrading buildings with structural deficiencies and repairing structures damaged by seismic events determined in recent years a growing interest among scientific community and structural engineers towards fiber reinforced polymer (FRP) composites. This is confirmed by the several practical applications on RC [7], masonry [8][9][10][11], and timber [12] structures and by issuing of specific technical guidelines in many countries [13][14][15][16]. Several researches have shown the effectiveness of FRP composites for strengthening of beam-column joints in terms of shear strength and energy dissipation capacity [17][18][19][20].…”

“…[20] by means of pseudodynamic tests. Since the debonding of composite material from the support is recognized as the typical failure mode of FRP strengthened concrete and masonry [9][10][11][21][22][23][24][25], the strengthening setup adopted by some researchers involved the adoption of bolted steel plates in an attempt to provide a mechanical anchorage of the composite material [17,18]. Two main topics have been addressed by researchers: (i) use of FRP composites for strengthening beam-column joints of RC frames with inadequate reinforcement detailing [26], and (ii) use of FRP composites for repairing beam-column joints of RC frames with inadequate reinforcement detailing and damaged by a previous seismic event [17][18][19][20].…”

Aerogami: Composite origami structures as active aerodynamic Ccontrol

“…Noting that w 1 · w 2 = (l F P ) 2 cos(θ), this angle can be determined from the scalar product between the w 1 and w 2 . This gives the following equation: θ = cos −1 (cos 2 (α)) (7) Leveraging the foregoing expression, the surface area as a function of the linear displacement, x, can be calculated as follows:…”

A review on the bond behavior of FRP composites applied on masonry substrates

“…Different approaches can be used, based on inverse analyses [52] or more simple calibration techniques [53], with a postprocessing of experimental strain recorded along the FRP reinforcement. Another example concerning the assessment of appropriate shear force-slip relationships, assuming a function for approximating experimental strain profiles, can be found in [54].…”