Punching shear strength of glass fiber-reinforced polymer reinforced concrete flat slabs

• Published in: Canadian journal of civil engineering Vol. 40; no. 10; pp. 951 - 960
• Main Authors: HASSAN, Mohamed, AHMED, Ehab A, BENMOKRANE, Brahim
• Format: Journal Article
• Language: English
• Published: Ottawa, ON NRC Research Press 01.10.2013; National Research Council of Canada; Canadian Science Publishing NRC Research Press
• Subjects: Applied sciences; bidirectionnel; Building structure; Buildings. Public works; colonne–dalle; conception; Concrete slabs; Construction (buildings and works); dalle; dalle plate; design; Exact sciences and technology; Failure; fiber-reinforced polymer; flat slab; Glass fiber reinforced plastics; Mathematical analysis; Mechanical properties; poinçonnement-cisaillement; Polymers; polymère renforcé de fibres; Punching shear; Reinforced concrete; Reinforced concrete structure; Reinforced plastics; Reinforcement; Reinforcing steels; Shear (Mechanics); Shear strength; slab; Slabs; slab–column; Steel; Strength of materials (elasticity, plasticity, buckling, etc.); Structural analysis. Stresses; thickness; two-way; épaisseur; Canada; Instruments; Stress strain relation; Cracking; Experimental study; Forecast model; Reinforced concrete; Experimental result; Failure analysis; Concrete construction; Punching shear; Reinforcement; Fibre reinforced plastics; Properties of materials; Glass fiber; Slabs
• ISSN: 0315-1468; 1208-6029
• DOI: 10.1139/cjce-2012-0177

This paper investigates the punching shear behavior of two-way flat slabs reinforced with glass fiber-reinforced polymer (GFRP) bars. A total of 17 full-scale interior slab–column specimens measuring 2500 mm × 2500 mm reinforced with GFRP and steel bars were constructed and tested under concentric loads until failure. The test parameters were: (i) reinforcement type (GFRP and steel) and ratio (0.34% to 1.66%); (ii) slab thickness (200 mm and 350 mm); (iii) column dimensions (300 mm × 300 mm; 450 mm × 450 mm); (iv) concrete strength (30 to 47 MPa); and (v) GFRP compression reinforcement crossing the column cross section. The test results were reported in terms of cracking behavior, deflection, strains in concrete and reinforcement, punching shear capacity, and mode of failure. The test results were also employed to assess the accuracy of the available punching shear capacity equations, including the new punching equation in Canadian Standards CAN/CSA S806-12.