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Earthquakes and Structures
  Volume 16, Number 5, May 2019, pages 533-546
DOI: http://dx.doi.org/10.12989/eas.2019.16.5.533
 


Cyclic performance of steel fiber-reinforced concrete exterior beam-column joints
Romanbabu M. Oinam, P.C. Ashwin Kumar and Dipti R. Sahoo

 
Abstract
    This study presents an experimental investigation on six beam-column joint specimens under the lateral cyclic loading. The aim was to explore the effectiveness of steel fiber-reinforced concrete (SFRC) in reducing the transverse shear stirrups in beam-column joints of the reinforced concrete (RC) frames with strong-columns and weak-beams. Two RC and four SFRC specimens with different types of reinforcement detailing and steel fibers of volume fraction in the range of 0.75-1.5% were tested under gradually increasing cyclic displacements. The main parameters investigated were lateral load-resisting capacity, hysteresis response, energy dissipation capacity, stiffness degradation, viscous damping variation, and mode of failure. Test results showed that the diagonally bent configuration of beam longitudinal bars in the beam-column joints resulted in the shear failure at the joint region against the flexural failure of beams having straight bar configurations. However, all SFRC specimens exhibited similar lateral strength, energy dissipation potential and mode of failure even in the absence of transverse steel in the beam-column joints. Finally, a methodology has been proposed to compute the shear strength of SFRC beam-column joints under the lateral loading condition.
 
Key Words
    beam-column joints; cyclic loading; failure; reinforcement detailing; steel fiber-reinforced concrete
 
Address
Romanbabu M. Oinam: Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Tirupati-517506, India
P.C. Ashwin Kumar: Department of Earthquake Engineering, Indian Institute of Technology Roorkee, Roorkee 247667, India
Dipti R. Sahoo: Department of Civil Engineering, Indian Institute of Technology Delhi, New Delhi-110016, India
 

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