Abstract
The effect of inclusion of steel libers on the shear behavior of High-Strength concrete (HSC) sleep beans with a characteristic compressive strength generally approaching 90 MPa is investigated. Fourteen HSC simply supported deep beams without web reinforcement were tested under two-point symmetric lop loading. The primary variables considered in this Study were the characteristic compressive strength, the amount of steel fibers and shear span-lo-depth ratios (a/d). Comparing the behavior of identical beams with and without steel fibers showed that high-Strength Fiber Reinforced Concrete (HSPRC) deep beams have higher stiffness, higher initial diagonal cracking and higher ultimate load. Reduction or old ratio increases both the diagonal cracking and ultimate shear strength of HSFRC deep beans. increasing the amount of steel fibers considerably reduces the crack width and increase the shear strengh. Depending on the results of this investigation, an empirical equation (similar to the equation used by the Egyptian code for predicting dre hear strength of deep beams without steel fibers) was proposed for predicting the shear strength of H-ISFRC deep beans.
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