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Structural Engineering and Mechanics
  Volume 54, Number 1, April10 2015, pages 1-17

Behavior and crack development of fiber-reinforced concrete spandrel beams under combined loading: an experimental study
Omer Farouk Ibraheem, B.H. Abu Bakar and I. Johari

Abstract     [Full Text]
    An experimental investigation is conducted to examine the behavior and cracking of steel fiberreinforced concrete spandrel L-shaped beams subjected to combined torsion, bending, and shear. The experimental program includes 12 medium-sized L-shaped spandrel beams organized into two groups, namely, specimens with longitudinal reinforcing bars, and specimens with bars and stirrups. All cases are examined with 0%, 1%, and 1.5% steel fiber volume fractions and tested under two different loading eccentricities. Test results indicate that the torque to shear ratio has a significant effect on the crack pattern developed in the beams. The strain on concrete surface follows the crack width value, and the addition of steel fibers reduces the strain. Fibrous concrete beams exhibited improved overall torsional performance compared with the corresponding non-fibrous control beams, particularly the beams tested under high eccentricity.
Key Words
    reinforced concrete; torsion; combined loading; spandrel beam; steel fiber; crack
Omer Farouk Ibraheem, B.H. Abu Bakar and I. Johari: Department of Civil Engineering, University Sains Malaysia (USM), Penang, Malaysia

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