Effective Steel Area of Fully Embedded Cold-Formed Steel Frame in Composite Slab System under Pure Bending


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In conjunction with the promote of Industrial Building System (IBS) in Malaysia building construction, precast units such as slab, beam and column were widely used. This paper reports on the determination of the effective cross sectional area of the proposed cold-formed sections that embedded in precast concrete slab. The cold-formed steel sections are single and double lipped channel section, with 100mm in depth, 50 mm width, 12 mm lips length and 1.55 mm thickness. In order to determine the flexural capacity of the composite slab system, it is necessary to identify the effective cross sectional area of the section contributes to load-carrying of the slab system. The calculation method was based on the effective width method concept from BS EN 1993-1-3 and BS EN 1993-1-5. Four types of cold-formed steel frame profiles that embedded in the concrete to form a new type of composite slab system were used to study in this paper. The four types of cold-formed steel section configuration are S1-SV, S2-SH, S3-DV and S4-DH. From the analytical calculation, S3-DV has the highest effective cross-sectional area, which it only consists of 2% ineffective area for load-carry capacity. Besides that, single lipped section S2-SH fully utilized the cross sectional in carrying load. It can be concluded that S3-DV is predicted to have highest bending resistance than other three types of configuration with condition that the reliability of the prediction need to verify as other factors such as shear bonding and shifted neutral axis happened due to combination of concrete and cold-formed section which, will also contribute the strength capacity of the composite slab system.



Edited by:

Wen-Hsiang Hsieh




Y. L. Lee et al., "Effective Steel Area of Fully Embedded Cold-Formed Steel Frame in Composite Slab System under Pure Bending", Applied Mechanics and Materials, Vols. 284-287, pp. 1300-1304, 2013

Online since:

January 2013




[1] AASHTO, LRFD Bridge Design Specification. 3rd ed., American Association of State Highway and Transportation Officials, Washington DC, (2005).

[2] C.E. Ekberg, R.M. Schuster, Floor System with Composite from Reinforced Concrete Slabs. IABSE Final Report, New York, 1968, pp.385-394.

[3] M.L. Porter, C.E. Ekberg, Design Recommendations for Steel Deck Floor Slabs. Journal of Structural Division 102(ST11), (1976) 21-36.

[4] B.S. Lakkavalli and Y. Liu, Experimental Study of Composite Cold-formed Steel C-Section Floor Joists. Journal of Constructional Steel Research 62 (2006) 995-1006.

DOI: https://doi.org/10.1016/j.jcsr.2006.02.003

[5] A.G.J. Way and M.D. Heywood, Design of Light Steel Sections to Eurocode 3 (ED 005). The Steel Construction Institute, UK, (2012).

[6] BSI. BS EN 1993-1-3: 2006: Design of Steel Structures. General Rules. Supplementary Rules for Cold-Formed Members and Sheeting. British Standard Institute, UK, (2006).

DOI: https://doi.org/10.3403/02338401u

[7] BSI. BS EN 1993-1-5: 2006: Design of Steel Structures. Plated Structural Elements. British Standard Institute, UK, (2006).