Shear Behavior of Fiber-Reinforced HPC Deep Beams


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Title: Shear Behavior of Fiber-Reinforced HPC Deep Beams

Author(s): I.K. Fang and J.Y. Wu

Publication: Special Publication

Volume: 149


Appears on pages(s): 523-544

Keywords: Beams (supports); concretes; deep beams; fiber reinforced concrete; fibers (discrete fibers); high-performance concretes; high-strength concretes; reinforced concrete; shear properties; trusses

Date: 10/1/1994

An experimental investigation was conducted on the shear behavior of deep beams made with steel fiber reinforced high performance concrete (HPC). Twenty-six beam specimens with various shear span-effective depth ratios, steel fiber contents, amounts of vertical and horizontal web reinforcements were tested under static loads. In addition to the strength test, extensive instrumentations were designed for the measurements of average strains of reinforced concrete in the shear span and strains of web reinforcements. The web-shear cracking initiated as the first inclined shear crack. About 30% increase in the inclined shear strength and 25% increase in the ultimate shear strength can be achieved with addition of 1 .O% steel fiber for specimens having a/d= 1 .5. The strain of vertical web reinforcements became negative and the horizontal web reinforcements were stretched to yield state for specimens having a/d ratios approach 0.5. The measured load-deformation relationships of reinforced concrete and strains of web reinforcements were compared with the prediction of the softened truss model of steel fiber reinforced concrete proposed by other investigators. Good correlation was found from the comparisons.