Abstract
This paper investigates the influence of commonly used screw connections on the integrity of built-up beams formed by connecting two lipped channel sections in a back-to-back configuration. An experimental investigation on the behaviour of 6 built-up CFS beams connected by self-drilling screws is presented in this paper. The screw spacing was varied along the length as well as the depth of the beams. The test results indicate that the screw spacing has some influence on the capacity of the built-up beams. An increase in screw spacing leads to an undesirable separation of channels and thus has a negative impact on the composite action between the members. Finite element models were developed and after successful validation, a parametric study involving 124 models was carried out, to investigate the impact of larger longitudinal screw spacings on the integral behaviour of the beams. It was observed that the flexural capacity decreased by 11%, 14%, 17% and 19% when the longitudinal distance between the screws increased from 50 to 1050 mm for beams with web depths 150 mm, 200 mm, 250 mm and 300 mm respectively. It can be concluded that flexural capacity is directly proportional to the decrease in the screw spacing and increase in the number of screw rows. The results also indicate that the percentage decrease in strength is greater for beams with larger web depths. An idealized cross section assuming complete composite action was simulated for each web depth using FE modelling and the capacities of all the screw-connected “semi-rigid” beams were compared against it. The capacity of screw connected built-up beams with web depths 150 mm, 200 mm, 250 mm and 300 mm was found to be 0.71, 0.64, 0.61 and 0.59 times that of the idealized cross-section on average, respectively. The moment capacities of screw-connected beams were also compared against the theoretical values obtained from AISI S-100. It was observed that the design guidelines provided in AISI S-100 were unable to account for the reduction in the moment capacity due to the screw connection in built-up members. AISI S-100 is conservative by as much as 34%, 42%, 46% and 48% for beams with web depths 150 mm, 200 mm, 250 mm and 300 mm respectively.
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References
ABAQUS CAE User’s Manual version 6.14 (2014) ‘Dassault Systemes Simulia Corp.’ USA.
AISI-American Iron and Steel Institute (2016) ‘North American Specification for the Design of Cold-Formed Steel Structural Members AISI S100–16’, Aisi, 8(1).
Anapayan, T., Mahendran, M., & Mahaarachchi, D. (2011). Lateral distortional buckling tests of a new hollow flange channel beam. Thin-Walled Structures, 49(1), 13–25. https://doi.org/10.1016/j.tws.2010.08.003
Chen, B., et al. (2020). Moment capacity of cold-formed channel beams with edge-stiffened web holes, un-stiffened web holes and plain webs. Thin-Walled Structures. https://doi.org/10.1016/j.tws.2020.107070
Deepak, M. S., & Shanthi, V. M. (2018). Distortional buckling-moment resistance capacity of hybrid double-i-box beams. Journal of Structural Engineering, 144(9), 04018132. https://doi.org/10.1061/(asce)st.1943-541x.0002100
Foraboschi, P. (2019). Lateral load-carrying capacity of steel columns with fixed-roller end supports. Journal of Building Engineering. https://doi.org/10.1016/j.jobe.2019.100879
Foraboschi, P. (2020). Predictive formulation for the ultimate combinations of axial force and bending moment attainable by steel members. International Journal of Steel Structures, 20(2), 705–724. https://doi.org/10.1007/s13296-020-00316-6
Georgieva, I., et al. (2012a). Experimental investigation of built-up double-Z members in bending and compression. Thin-Walled Structures, 53, 48–57. https://doi.org/10.1016/j.tws.2011.12.017
Georgieva, I., et al. (2012b). Numerical study of built-up double-Z members in bending and compression. Thin-Walled Structures, 60, 85–97. https://doi.org/10.1016/j.tws.2012b.07.005
Georgieva, I., Schueremans, L., & Pyl, L. (2012). Composed columns from cold-formed steel Z-profiles: Experiments and code-based predictions of the overall compression capacity. Engineering Structures, 37, 125–134. https://doi.org/10.1016/j.engstruct.2011.12.017
Ghannam, M. (2019). Bending moment capacity of cold-formed steel built-up beams. International Journal of Steel Structures, 19(2), 660–671. https://doi.org/10.1007/s13296-018-0155-2
Islam, S. M. Z., Cai, Y., & Young, B. (2019). Design of CFRP-strengthened stainless steel tubular sections subjected to web crippling. Journal of Constructional Steel Research, 159, 442–458. https://doi.org/10.1016/j.jcsr.2019.04.043
IS Code (2008) Cold Reduced Low Carbon Steel Sheet And Strip (Fifth Revision), Indian Standards.
Keerthan, P., & Mahendran, M. (2013). Suitable stiffening systems for LiteSteel beams with web openings subjected to shear. Journal of Constructional Steel Research, 80, 412–428. https://doi.org/10.1016/j.jcsr.2012.08.004
Laím, L., et al. (2014). Experimental analysis on cold-formed steel beams subjected to fire. Thin Walled Structures, 74, 104–117. https://doi.org/10.1016/j.tws.2013.09.006
Laím, L., Paulo, J., & Rodrigues, C. (2016). Numerical analysis on axially-and-rotationally restrained cold-formed steel beams subjected to fi re. Thin Walled Structures, 104, 1–16. https://doi.org/10.1016/j.tws.2016.03.004
Laím, L., & Rodrigues, J. P. C. (2018). Fire design methodologies for cold-formed steel beams made with open and closed cross-sections. Engineering Structures, 171, 759–778. https://doi.org/10.1016/j.engstruct.2018.06.030
Laím, L., Rodrigues, J. P. C., & da Silva, L. S. (2013). Experimental and numerical analysis on the structural behaviour of cold-formed steel beams. Thin-Walled Structures, 72, 1–13. https://doi.org/10.1016/j.tws.2013.06.008
Roy, K., et al. (2021). Flexural behaviour of back-to-back built-up cold-formed steel channel beams: Experiments and finite element modelling. Structures, 29, 235–253. https://doi.org/10.1016/j.istruc.2020.10.052
Schafer, B. W., Li, Z., & Moen, C. D. (2010). Computational modeling of cold-formed steel. Thin-Walled Structures, 48(10–11), 752–762. https://doi.org/10.1016/j.tws.2010.04.008
Selvaraj, S., & Madhavan, M. (2019). Structural design of cold-formed steel face-to-face connected built-up beams using direct strength method. Journal of Constructional Steel Research, 160, 613–628. https://doi.org/10.1016/j.jcsr.2019.05.053
Siahaan, R., Keerthan, P., & Mahendran, M. (2018). Lateral distortional buckling of rivet fastened rectangular hollow flange channel beams. Journal of Constructional Steel Research, 144, 295–309. https://doi.org/10.1016/j.jcsr.2018.01.003
ASTM Standard E8/E8M-13a (2013) Standard Test Methods for Tension Testing of Metallic Materials. ASTM International, pp. 1–27. Doi: https://doi.org/10.1520/E0008_E0008M-13A.
Suhaib, M. B., & Tantray, M. A. (2022a). ‘Behaviour of cold-formed steel tensile members strengthened with GFRP using different techniques. Innovative Infrastructure Solutions. https://doi.org/10.1007/s41062-022-00851-7
Suhaib, M. B., & Tantray, M. A. (2022b). Behaviour of GFRP stiffened cold-formed steel built-up beams. International Journal of Steel Structures, 22(4), 1042–1059. https://doi.org/10.1007/s13296-022-00621-2
Wang, L., & Young, B. (2015). Beam tests of cold-formed steel built-up sections with web perforations. Journal of Constructional Steel Research, 115, 18–33. https://doi.org/10.1016/j.jcsr.2015.08.001
Wang, L., & Young, B. (2016a). Behavior of cold-formed steel built-up sections with intermediate stiffeners under bending I: Tests and numerical validation. Journal of Structural Engineering, 142(3), 04015150. https://doi.org/10.1061/(asce)st.1943-541x.0001428
Wang, L., & Young, B. (2016b). Behavior of cold-formed steel built-up sections with intermediate stiffeners under bending. II: Parametric study and design. Journal of Structural Engineering, 142(3), 04015151.
Wang, L., & Young, B. (2017). Design of cold-formed steel built-up sections with web perforations subjected to bending. Thin-Walled Structures, 120, 458–469. https://doi.org/10.1016/j.tws.2017.06.016
Wang, L., & Young, B. (2018). Behaviour and design of cold-formed steel built-up section beams with different screw arrangements. Thin-Walled Structures, 131, 16–32. https://doi.org/10.1016/j.tws.2018.06.022
Xu, L., Sultana, P., & Zhou, X. (2009a). Flexural strength of cold-formed steel built-up box sections. Thin-Walled Structures, 47(6–7), 807–815. https://doi.org/10.1016/j.tws.2009a.01.005
Acknowledgements
This project was funded by a research grant under Technical Education Quality Improvement Programme (TEQIP-III) provided by the Government of India. Also, the authors thankfully acknowledge the National Institute of Technology Srinagar, India to provide the infrastructure to conduct the present research.
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Suhaib, M.B., Tantray, M.A. Flexural Integrity Between the Individual Channels of Built-Up Cold-Formed Steel Beams. Int J Steel Struct 23, 503–520 (2023). https://doi.org/10.1007/s13296-023-00708-4
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DOI: https://doi.org/10.1007/s13296-023-00708-4