Abstract
This paper is concerned with the investigation of concrete-filled steel composite (CFSC) stub columns with bar stiffeners. In order to study the behaviour of the columns, the finite element software LUSAS is used to conduct the non-linear analyses. Results from the non-linear finite element analysis and the corresponding experimental test are compared which reveal the reasonable accuracy of the three-dimensional finite element modelling. A special arrangement of bar stiffeners in the columns with various number, spacing and diameters of the bar stiffeners are developed and studied using the non-linear finite element method. Effects of various variables such as different number and spacing of the bar stiffeners and also steel wall thicknesses on the ultimate axial load capacity and ductility of the columns are examined. Moreover, effects of different diameters of the bar stiffeners, concrete compressive strengths and steel yield stresses on the ultimate axial load capacity of the columns are evaluated. It is concluded from the study that the variables significantly influence the behaviour of the columns. The obtained results from the finite element analyses are compared with those predicted values by the design code EC4 and suggested equations of the previous researches.
Highlights
Steel columns have the benefits of high ductility and tensile strength; on the other hand, reinforced concrete columns possess the benefits of large stiffness and compressive strength
The concrete-filled steel composite (CFSC) columns have structural benefits such as high strength, large stiffness and high ductility and possess ecological benefits over reinforced concrete columns: reinforcement and formwork are not utilised in the CFSC columns which result in a clean construction site; when the building is demolished, high-strength concrete which is without reinforcement in the CFSC columns can be crushed and reused as aggregates
This paper presents the investigation of the CFSC stub columns with bar stiffeners
Summary
Steel columns have the benefits of high ductility and tensile strength; on the other hand, reinforced concrete columns possess the benefits of large stiffness and compressive strength. Experimental investigation of stiffened thin-walled hollow steel structural stub columns filled with concrete was carried out by Tao et al (2008) to uncover strength and ductility of such columns. Bahrami et al (2011a) studied structural behaviour of CFSC slender columns to investigate and develop different shapes (V, T, L, Line & Triangular) and number (1 on side & 2 on side) of longitudinal cold-formed steel sheeting stiffeners and evaluate their effects on the behaviour of the columns. Effects of different diameters of the bar stiffeners, concrete compressive strengths and steel yield stresses on the ultimate axial load capacity of the columns are assessed. The obtained ultimate axial load capacities from the non-linear finite element analyses are compared with the predicted capacities by the design code Eurocode 4 (2004) and recommended equations by Baig et al (2006) and Bahrami et al (2011b)
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