Vol. 15, No. 4, pp. 306-315 (2019)
BENDING BEHAVIOR OF COLD-FORMED STEEL–CONCRETE COMPOSITE FLOORS
Xin-mei Yao1, Xu-hong Zhou1, 2, 3, Yu Guan1, Yu Shi2, 3, *and Zi-qi He2,3
1College of Civil Engineering, Chang'an University, Xi'an, China
2School of Civil Engineering, Chongqing University，Chongqing, China
3Key Laboratory of New Technology for Construction of Cities in Mountain Area (Ministry of Education), Chongqing University, Chongqing, China
* (Corresponding author: E-mail: This email address is being protected from spambots. You need JavaScript enabled to view it.)
Received: 10 October 2018; Revised: 28 April 2019; Accepted: 01 May 2019
DOI:10.18057/IJASC.2019.15.4.1
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ABSTRACT
In cold-formed steel framing constructions, cold-formed steel–concrete composite floors built with concrete slabs and cold-formed steel joists are a common floor system. To investigate the bending behavior of such a floor system, two floor specimens with alternative slab materials were evaluated. The test results indicated that varying the slab materials had no significant influence on the ultimate bending capacity; however, the stiffness of the composite floor with a concrete slab was much higher than that of the floor with a gypsum-based self-leveling underlayment slab. A finite element model was developed and validated with the test results to simulate the bending behavior of the floors using the ANSYS finite element software. Parametric investigations were conducted through the verified finite element models. The results showed that the web depth-to-thickness ratio, span-to-depth ratio of the joist, and steel strength significantly affected the ultimate bending capacity of the composite floors, whereas the effects of screw spacing and concrete slab thickness were negligible. Finally, a simplified method was proposed to evaluate the ultimate moment capacity of cold-formed steel–concrete composite floors. The results obtained from the proposed method were validated by both experimental and numerical investigations of two full-scale cold-formed steel–concrete composite floors built with concrete slabs and cold-formed steel joists.
KEYWORDS
Composite floor, Bending behavior, Cold-formed steel, Experimental study, Numerical analysis, Simplified method
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