Mechanical behavior of stirrup-confined circular concrete-filled
steel tubular stub columns under axial loading |
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| Authors: | ZHU Jiang DING Faxing WANG Liping |
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| Affiliation: | 1. School of Civil Engineering, Central South University, Changsha 410075, China;
2. National Engineering Laboratory for High Speed Railway Construction, Central South University, Changsha 410075, China; |
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| Abstract: | This paper presents a comparative study between concrete-filled steel tubular (CFT) stub columns with bidirectional stirrups, loop stirrups and orthogonal stirrups. Axial compression tests have been carried out aiming at investigating the effects of the stirrup form and volume-stirrup ratio on the mechanical and deformed behavior of stirrup-confined circular CFT stub columns. ABAQUS was used to establish 3D finite element (FE) models for simulation of stirrup-confined circular CFT stub columns under axial loading with rational constitutive models for concrete material under triaxial stress and steel material, respectively. The numerical results were in good agreement with the test results. Furthermore, the composite action among the steel tube, stirrups and core concrete stirrup-confined circular CFT columns were investigated. The results indicate that the bearing capacity, ductility and composite action of a circular CFT stub column with orthogonal stirrups is higher than those with the other two stirrup types. Increasing the volume-stirrup ratio will increase the bearing capacity and ductility of stirrup-confined circular CFT stub column significantly. |
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| Keywords: | circular CFT stub column stirrup-confined composite action axial compression test bearing capacity |
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