A New Punching Shear Equation for Two-Way Concrete Slabs Reinforced with FRP Bars


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Title: A New Punching Shear Equation for Two-Way Concrete Slabs Reinforced with FRP Bars

Author(s): S. El-Gamal, E.F. El-Salakawy, and B. Benmokrane

Publication: Special Publication

Volume: 230


Appears on pages(s): 877-894

Keywords: concrete slabs; design models; FRP reinforcement; punching shear

Date: 10/1/2005

Recently, there has been a rapid increase in using the non-corrodible fiber-reinforced polymers (FRP) reinforcing bars as alternative reinforcements for concretestructures especially those in harsh environments. The elastic stiffness, ultimatestrength, and bond characteristics of FRP reinforcing bars are quite different from thoseof steel, which affect the shear capacity. The recently published FRP design codes andguidelines include equations for shear design of one-way flexural members. However,very little work was done to investigate the punching shear behavior of two-way slabsreinforced with FRP bars. The current design provisions for shear in two-way slabs arebased on testing carried out on steel reinforced slabs. This study presents a new modelto predict shear capacity of two-way concrete slabs that were developed based onextensive experimental work. The accuracy of this prediction model was evaluatedagainst the existing test data. Compared to the available design models, the proposedshear model seems to have very good agreement with test results with betterpredictions for both FRP and steel-reinforced concrete two-way slabs.