Techno Press

Steel and Composite Structures   Volume 19, Number 5, November 2015, pages 1299-1319
Parametric study on eccentrically-loaded partially encased composite columns under major axis bending
Mahbuba Begum, Robert G. Driver and Alaa E. Elwi

Abstract     [Full Text]
    This paper presents a detailed parametric study, conducted using finite element tools to cover a range of several geometric and material parameters, on the behaviour of thin-walled partially encased composite (PEC) columns. The PEC columns studied herein are composed of thin-walled built-up H-shaped steel sections with concrete infill cast between the flanges. Transverse links are provided between the opposing flanges to improve resistance to local buckling. The parametric study is confined to eccentrically-loaded columns subjected to major axis bending only. The parameters that were varied include the overall column slenderness ratio (L/d), load eccentricity ratio (e/d), link spacing-to-depth ratio (s/d), flange plate slenderness ratio (b/t) and concrete compressive strength (fcu). The overall column slenderness ratio was chosen to be the primary variable with values of 5, 10 and 15. Other parameters were varied within each case of L/d ratio. The effects of the selected parameters on the behaviour of PEC columns were studied with respect to the failure mode, peak axial load, axial load versus average axial strain response, axial load versus lateral displacement response, moment versus lateral displacement behaviour and the axial load.moment interaction diagram. The results of the parametric study are presented in the paper and the influences of each of the parameters investigated are discussed.
Key Words
    composite; column; finite element; local buckling; partially encased; plate; slenderness ratio
(1) Mahbuba Begum:
Department of Civil Engineering, BUET, Dhaka, Bangladesh;
(2) Robert G. Driver, Alaa E. Elwi:
Department of Civil and Environmental Engineering, University of Alberta, Edmonton, AB, Canada.

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