Advanced Steel Construction

Vol. 12, No. 4, pp.410-427(2016)


PERFORMANCE OF STEEL-REINFORCED SQUARE

CONCRETE-FILLED STEEL HOLLOW SECTION

(SRSCFSHS) COLUMNS UNDER UNIAXIAL COMPRESSION

 

Jing-ming Cai1, Jin-long Pan1,* and Yu-fei Wu2

1 Key laboratory of concrete and pre-stressed concrete structures of Ministry of Education,

Southeast University, Nanjing, China

2 Department of Civil and Architectural Engineering, City University of Hong Kong, Hong Kong, China

*(Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)

Received: 18 February 2015; Revised: 10 December 2015; Accepted: 5 January 2016

 

DOI:10.18057/IJASC.2016.12.4.3

 

ABSTRACT:

Due to high load carrying capacity and convenience of designing column-beam connections, steel-reinforced square concrete-filled steel hollow section (SRSCFSHS) columns have been increasingly employed in the structural engineering. In this study, the mechanical behaviors of SRSCFSHS columns were numerically investigated with the software of ABAQUS/standard solver. To verify the validity of the finite element models of the composite columns, the simulation results were compared with the existing experimental results, and good agreement was achieved. According to the simulation results of SRSCFSHS columns, the encased section steel could restrain the generation or propagation of cracks in core concrete thus the composite column can obtain a higher strength and better ductility than that of normal square concrete filled steel tube (CFST) columns. Then, a total of twenty-six SRSCFSHS columns were numerically studied to examine the effect of steel tube ratio (αt), section steel ratio (αs), concrete strength (ƒcu), yield strength of steel tube (ƒty), yield strength of section steel (ƒsy) and the slenderness ratio (λ) on the mechanical properties of the SRSCFSHS columns under uniaxial compression. A new model was then proposed since the model in Eurocode 4 comparatively underestimated the strength of SRSCFSHS column. Based on the comparison between the calculation results from the proposed approach and experimental results, the proposed model can provide reliable prediction of the strength of SRSCFSHS columns.

 

Keywords:

SRSCFSHS columns, finite element analysis, mechanical behavior, parametric study, new approach

 

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