Document Type : Original Article
Authors
1
International Academy for Engineering and MedAssociate Professor, Department of civil engineering, faculty of engineering (Shoubra), Benha University,108 Shoubra St., Shoubra, Cairo, Egyptia Science
2
Professor of Reinforced Concrete Structures, Department of civil engineering, faculty of engineering (Shoubra), Benha University,108 Shoubra St., Shoubra, Cairo, Egypt
3
Assistance Professor of Structural Engineering, Delta Higher Institute for Engineering and Technology, El Mansoura, Egypt
Abstract
This paper presents the results of an experimental program and a nonlinear numerical investigation on the behavior of high strength steel fiber reinforced concrete deep beams under monotonic static loads. Seventeen simply-supported deep beams were tested and analyzed. The mean compressive strength of concrete is 60 MPa. The specimens are divided into five groups with different structural parameters. The studied parameters are: (1) steel fiber volume fractions, (2) fibers aspect ratios, (3) shear span-to-depth ratios, (4) horizontal web reinforcement and (5) vertical web reinforcement ratios. The measured testing results are used to study the influence of steel fibers on the structural response such as: (1) the first diagonal cracking load, (2) ultimate shear capacity, (3) load-deflection curves, (4) load-steel strain relationships, (5) failure modes, and (6) crack propagation patterns. The testing results indicated that the load carrying capacity at different levels, and displacement ductility increased considerably with the increase of fiber volume and/or fiber aspect ratio. Also, inclusion of steel fibers delays the crack propagation process and reduces the deflection and crack width. Also, the results showed that the measured concrete strain profiles at critical sections are nonlinear. In this study, the tested beams were modeled using ANSYS nonlinear finite element program which was modified to include the fibers enhancement on the stress-strain relations and failure surface. The finite element predictions of the structural response show good agreement with the observed experimental behavior.
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