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Computers and Concrete
  Volume 9, Number 6, June 2012, pages 403-426
DOI: http://dx.doi.org/10.12989/cac.2012.9.6.403
 


Structural behaviour of tapered concrete-filled steel composite (TCFSC) columns subjected to eccentric loading
Alireza Bahrami, Wan Hamidon Wan Badaruzzaman and Siti Aminah Osman

 
Abstract
    This paper deals with the structural behaviour of tapered concrete-filled steel composite (TCFSC) columns under eccentric loading. Finite element software LUSAS is used to perform the nonlinear analyses to predict the structural behaviour of the columns. Results from the finite element modelling and existing experimental test are compared to verify the accuracy of the modelling. It is demonstrated that they correlate reasonably well with each other; therefore, the proposed finite element modelling is absolutely accurate to predict the structural behaviour of the columns. Nonlinear analyses are carried out to investigate the behaviour of the columns where the main parameters are: (1) tapered angle (from 0o to 2.75o); (2) steel wall thickness (from 3 mm to 4 mm); (3) load eccentricity (15 mm and 30 mm); (4) L/H ratio (from 10.67 to 17.33); (5) concrete compressive strength (from 30 MPa to 60 MPa); (6) steel yield stress (from 250 MPa to 495 MPa). Results are depicted in the form of load versus mid-height deflection plots. Effects of various tapered angles, steel wall thicknesses, and L/H ratios on the ultimate load capacity, ductility and stiffness of the columns are studied. Effects of different load eccentricities, concrete compressive strengths and steel yield stresses on the ultimate load capacity of the columns are also examined. It is concluded from the study that the parameters considerably influence the structural behaviour of the columns.
 
Key Words
    tapered concrete-filled steel composite column; eccentric loading; finite element; nonlinear analysis; ultimate load capacity; ductility; stiffness; concrete compressive strength; steel yield stress.
 
Address
Alireza Bahrami, Wan Hamidon Wan Badaruzzaman and Siti Aminah Osman: Department of Civil and Structural Engineering, Universiti Kebangsaan Malaysia, Bangi, Selangor, Malaysia
 

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