Different CFRP strengthening techniques for prestressed hollow core concrete slabs: Experimental study and analytical investigation

Efficient near surface mounting CFRP strengthening of pretensioned hollowcore slabs with opening – An experimental study

“…Strengthening of hollowcore slabs using CFRP fabric and strips was also studied by [25,26] several researchers in the past. Both the fabric and strips increased the capacity of the slabs by about 80% when compared with control specimens.…”

Numerical web-shear strength assessment of precast prestressed hollow core slab units

“…By contrast, the unit itself is commonly reinforced only by straight longitudinal prestressing steel strands, since the use of typical transverse reinforcement is inhibited by the production process. Because stirrups and draped strands are unfeasible for such precast members and carbon fiber polymers [10] or fiber reinforced concretes [11] are at the moment promising strengthening techniques analyzed in research applications but not so diffused in building practice, the only reserve against shear is provided by the resistance of the traditionally used medium/high-strength concrete that, anyway, presents some intrinsic criticalities [12]. Different contributions to the shear transfer mechanism with respect to traditional normal-strength concretes were observed, as well as smoother cracks, implying a significant reduction of the potential for shear transfer through the aggregate interlock action, which is not explicitly accounted in conventional design approaches against web-shear failure mechanism.…”

Numerical study to investigate the behavior of reinforced concrete slabs with CFRP sheets

“…In general, the flexural strength capacity increase due to using FRB composite and the mode of failure remained flexural mode which is better than shear or compression failure. The influence of strengthening beams with FRP on strain, deflection, failure load and mode, ductility of beam, and flexural and shear strengthening were thoroughly studied (Al-Rousan, Issa, & Shabila, 2012;Barros, Dias, & Lima, 2007;Dias & Barros, 2012;Elgabbas, El-Ghandour, Abdelrahman, & El-Dieb, 2010;Grace, Sayed, Soliman, & Saleh, 1999;Michel, Ferriera, Agbossou, & Hamelina, 2009;Rosemol, Ashokkumar, & Ananya, 2015). Scott, Shenghua, Seo, & Rudolf (2011) studied the effectiveness of FRP anchors in increasing the strength and deflection of FRP flexurally strengthened RC slab (RCS).…”