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Steel and Composite Structures
  Volume 44, Number 3, August10 2022 , pages 295-307
DOI: https://doi.org/10.12989/scs.2022.44.2.295
 


Influence of loading method and stiffening on the behavior of short and long CFST columns
Fattouh M.F. Shaker, Gouda M. Ghanem, Ahmed F. Deifalla, Ibrahim S. Hussein and Mona M. Fawzy

 
Abstract
    The objective of this research is to study experimentally the behavior of stiffened steel tubes (CFSTs). Considered parameters are stiffening methods by through-bolts or shear connectors with different configurations. In addition, the effect of global (ratio between length to diameter) and local (proportion between diameter to thickness) slenderness ratios are investigated. Load application either applied on steel only or both steel and concrete is studied as well. Case of loading on steel only happens when concrete inside the column shrinks. The purpose of the research is to improve the behavior of CFSTs by load transfer between them and different stiffening methods. A parametric experimental study that incorporates thirty-three specimens is carried out to highlight the impact of those parameters. Different outputs are recorded for every specimen such as load capacities, vertical deflections, longitudinal strains, and hoop strains. Two modes of failure occur, yielding and global buckling. Shear connectors and through-bolts improve the ultimate load by up to 5% for sections loaded at steel with different studied global slenderness and local slenderness equal 63.5. Meanwhile, shear connectors or through bolts increase the ultimate load by up to 6% for global slenderness up to 15.75 for sections loaded on composite with local slenderness equals 63.50. Recommendations for future design code development are outlined.
 
Key Words
    composite columns; experimental study, shear connectors, through bolts
 
Address
Fattouh M.F. Shaker:Department of Structural Engineering, Faculty of Engineering, Helwan University Ain Helwan 11795, Cairo, Egypt

Gouda M. Ghanem:Department of Structural Engineering, Faculty of Engineering, Helwan University Ain Helwan 11795, Cairo, Egypt

Ahmed F. Deifalla:Department of Structural Engineering and construction management, Faculty of Engineering, Future University in Egypt, End of 90th St.,
Fifth Settlement, New Cairo, Cairo 11865, Egypt

Ibrahim S. Hussei:Civil Engineering Program, The Higher Institute of Engineering, El-Shorouk Academy, Nakheel district 11837, Cairo, Egypt

Mona M. Fawzy:Civil Engineering Program, The Higher Institute of Engineering, El-Shorouk Academy, Nakheel district 11837, Cairo, Egypt
 

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