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Earthquakes and Structures
  Volume 19, Number 5, November 2020 , pages 315-329
DOI: https://doi.org/10.12989/eas.2020.19.5.315
 


Effect of bond and bidirectional bolting on hysteretic performance of through bolt CFST connections
M.S. Ajith, K.P. Beena and S. Sheela

 
Abstract
    Through bolt connections in Concrete Filled Steel Tubes (CFSTs) has been proved to be good in terms of seismic performance and constructability. Stiffened extended end plate connection with full through type bolt helps to avoid field weld altogether, and hence to improve the quality of joints. An experimental study was conducted on the hysteretic performance of square interior beam-column connections using flat extended end plates with through bolt. The study focuses on the effect of the bond between the tie rod and the core concrete on the cyclic performance of the joint. The study also quantifies how much the interior joint is getting strengthened due to the confinement effect induced by bi-directional bolting, which is widely used in 3D moment resisting frames. For a better understanding of the mechanism and for the prediction of shear capacity of the panel zone, a mathematical model was generated. The various parameters included in the model are the influence of axial load, amount of prestress induced by bolt tightening, anchorage, and the concrete strut action. The study investigates the strength, stiffness, ductility, and energy dissipation characteristics. The results indicate that the seismic resistance is at par with American Institute of Steel Construction (AISC) seismic recommendations. The bidirectional bolting and bond effect have got remarkable influence on the performance of joints.
 
Key Words
    CFST column; through bolt connection; cyclic loading; panel zone mechanism; bidirectional bolting
 
Address
M.S. Ajith, K.P. Beena : Department of Civil Engineering, College of Engineering, Trivandrum, 695016, India
S. Sheela: Department of Civil Engineering, Mohandas College of Engineering, Trivandrum, 695544, India
 

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