Techno Press

Computers and Concrete   Volume 9, Number 2, January 2012, pages 133-151
Prediction of deflection of high strength steel fiber reinforced concrete beams and columns
Ilker Fatih Kara and Cengiz Dundar

Abstract     [Full Text]
    This paper presents an analytical procedure for the analysis of high strength steel fiber reinforced concrete members considering the cracking effect in the serviceability loading range. Modifications to a previously proposed formula for the effective moment of inertia are presented. Shear deformation effect is also taken into account in the analysis, and the variation of shear stiffness in the cracked regions of members has been considered by reduced shear stiffness model. The effect of steel fibers on the behavior of reinforced concrete members have been investigated by the developed computer program based on the aforementioned procedure. The inclusion of steel fibers into high strength concrete beams and columns enhances the effective moment of inertia and consequently reduces the deflection reinforced concrete members. The contribution of the shear deformation to the total vertical deflection of the beams is found to be lower for beams with fibers than that of beams with no fibers. Verification of the proposed procedure has been confirmed from series of reinforced concrete beam and column tests available in the literature. The analytical procedure can provide an accurate and efficient prediction of deflections of high strength steel fiber reinforced concrete members due to cracking under service loads. This procedure also forms the basis for the three dimensional analysis of frames with steel fiber reinforced concrete members.
Key Words
    reinforced concrete; steel fibers; effective moment of inertia; effective shear modulus; cracking; deflections; high strength concrete.
Ilker Fatih Kara: Department of Civil Engineering, Nigde University, 51245, Nigde, Turkey

Cengiz Dundar: Department of Civil Engineering, Cukurova University, 01330, Adana, Turkey

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