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A platform for research: civil engineering, architecture and urbanism
Mechanical performance of stirrup-confined concrete-filled steel tubular stub columns under axial loading
Abstract This paper presents an experimental comparison between concrete-filled square steel tubular stub columns confined by internal loop or spiral stirrups, traditional square concrete-filled steel tubular stub columns (CFT), and inner stiffened square concrete-filled steel tubular stub columns. In total 11 specimens were prepared and loaded concentrically in compression to failure. From the experimental results, the superior mechanical performance of stirrup-confined CFT to stiffened CFT was first demonstrated and the effects of different configurations of confinement (such as internal stiffeners, hoops and stirrups) on the ultimate load-bearing capacity were clarified. ABAQUS was used to establish 3D finite element models for the CFT and stirrup-confined CFT stub columns under axial compression, in order to understand the contribution made by loop or spiral stirrup confinement to the improvement of overall mechanical performance. Further, a simplified approach was developed to estimate the ultimate bearing capacity of stirrup-confined CFT stub columns, with consideration of the confinement effects offered by both square steel tube and stirrups. The predicted results showed satisfactory agreement with the experimental and numerical results.
Highlights A proposal of stirrup-confined CFT columns with improved mechanical performance. Comparison between stirrup-confined CFT columns and CFT columns. Load sharing mechanism between steel tube, stirrups and concrete is clarified. Comprehensive parametric analysis on stirrup-confined CFT columns. Simplified method to predict the bearing capacity of stirrup-confined CFT columns.
Mechanical performance of stirrup-confined concrete-filled steel tubular stub columns under axial loading
Abstract This paper presents an experimental comparison between concrete-filled square steel tubular stub columns confined by internal loop or spiral stirrups, traditional square concrete-filled steel tubular stub columns (CFT), and inner stiffened square concrete-filled steel tubular stub columns. In total 11 specimens were prepared and loaded concentrically in compression to failure. From the experimental results, the superior mechanical performance of stirrup-confined CFT to stiffened CFT was first demonstrated and the effects of different configurations of confinement (such as internal stiffeners, hoops and stirrups) on the ultimate load-bearing capacity were clarified. ABAQUS was used to establish 3D finite element models for the CFT and stirrup-confined CFT stub columns under axial compression, in order to understand the contribution made by loop or spiral stirrup confinement to the improvement of overall mechanical performance. Further, a simplified approach was developed to estimate the ultimate bearing capacity of stirrup-confined CFT stub columns, with consideration of the confinement effects offered by both square steel tube and stirrups. The predicted results showed satisfactory agreement with the experimental and numerical results.
Highlights A proposal of stirrup-confined CFT columns with improved mechanical performance. Comparison between stirrup-confined CFT columns and CFT columns. Load sharing mechanism between steel tube, stirrups and concrete is clarified. Comprehensive parametric analysis on stirrup-confined CFT columns. Simplified method to predict the bearing capacity of stirrup-confined CFT columns.
Mechanical performance of stirrup-confined concrete-filled steel tubular stub columns under axial loading
Ding, Fa-xing (author) / Fang, Changjing (author) / Bai, Yu (author) / Gong, Yong-zhi (author)
Journal of Constructional Steel Research ; 98 ; 146-157
2014-03-11
12 pages
Article (Journal)
Electronic Resource
English