Shear Behavior of Hybrid Reinforced Concrete I-Beams Containing Steel Fiber Reinforced Concrete (SFRC)and High Strength Concrete (HSC

Abstract

This study presents experimental and theoretical investigation of shear behavior of hybrid reinforced concrete I-beams cast monolithically, but, the web is made with concrete differing from concretes of compression and tension flanges.A rational way has been used by replacing (or strengthening) a certain part(s) or layer(s) of I-shaped reinforced concrete beams by steel fiber reinforced concrete (SFRC) or high strength concrete (HSC). Three beams were tested in this investigation and only the concrete type of the web was varied. Experimental results showed that the ultimate shear strengths are increased (15 or 25%), while the reserve shear strength (after diagonal cracking) is increased (6 or 10%) for the tested beams containing SFRC or HSC in the web respectively. Crack arrest mechanism of steel fibers, and high compressive strength of concrete improved the tensile response, limited crack propagation, improved reserve strength and altered the failure mode. So, more safety was obtained.ANSYS finite Element models are used to simulate all tested beams.

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