Funct. Mater. 2017; 24 (3): 451-452.

doi:https://doi.org/10.15407/fm24.03.451

Nonlinear analysis of concrete-filled steel square tube strengthened by internal transverse stiffened bars under axial compression

Nan Li1,2, Lai Wang2, Yajun Xi3, Tong Guan1, Hui Wang1, Furui Dong1

1Department of Resources and Civil Engineering, Shandong University of Science & Technology, Taian, 271000, China
2School of Civil Engineering and Architecture,Shandong University of Science and Technology, Qingdao, 266590,China
3Tai’an engineering construction standard cost office, Taian, Shandong, 271000,China;

Abstract: 

A new type of concrete-filled square steel tubular(CFSST) column is proposed, which is characterized by the transverse stiffened steel bars arranged inside the pipe wall to improve confinement performance of the concrete core. This paper employs a nonlinear analysis of square CFSST stub columns under axial compression. A three-dimensional nonlinear finite element (FE) model is developed using ABAQUS, where nonlinear material behavior and enhanced strength corner properties of steel are included. Close agreement is achieved between the test and FE results in terms of load-deformation response and ultimate strength.

Keywords: 
Internal transverse stiffened bars, concrete-filled steel square tube, axial compression, finite element, strength

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