Several researches demonstrated that the addition of fibers in correct proportions can significantly increase the shear behavior of reinforced concrete elements, allowing to partially or totally replace the traditional web reinforcement. However, despite of this increase of knowledge about fiber reinforced concrete, there is still a gap in the applicability of fibers as shear reinforcement in certain precast and prestressed structural elements where the use of conventional transverse reinforcement is difficult due to their manufacturing process. In this context, the present paper presents the experimental results of full-scale tests on Hollow-Core Slabs (HCS) made with Polypropylene Fiber Reinforced Concrete (PFRC). In order to analyze the HCS end zones (critical zones in shear), several tests were performed on slabs adopting a shear-span-to-effective depth ratio equal to 3.5. Results show that macro-synthetic fibers are able to improve the shear strength of hollow-core slabs. The experimental results obtained were compared against the predictions of four international codes standards (Eurocode 2, ACI 318-11, Model Code 2010 and EN1168) as well.
Shear Behavior of Hollow-Core Slabs Reinforced by Macro-synthetic Fibers
Piemonti A.;Conforti A.;Plizzari G.;
2021-01-01
Abstract
Several researches demonstrated that the addition of fibers in correct proportions can significantly increase the shear behavior of reinforced concrete elements, allowing to partially or totally replace the traditional web reinforcement. However, despite of this increase of knowledge about fiber reinforced concrete, there is still a gap in the applicability of fibers as shear reinforcement in certain precast and prestressed structural elements where the use of conventional transverse reinforcement is difficult due to their manufacturing process. In this context, the present paper presents the experimental results of full-scale tests on Hollow-Core Slabs (HCS) made with Polypropylene Fiber Reinforced Concrete (PFRC). In order to analyze the HCS end zones (critical zones in shear), several tests were performed on slabs adopting a shear-span-to-effective depth ratio equal to 3.5. Results show that macro-synthetic fibers are able to improve the shear strength of hollow-core slabs. The experimental results obtained were compared against the predictions of four international codes standards (Eurocode 2, ACI 318-11, Model Code 2010 and EN1168) as well.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
