Calculation of flexural strength of cold formed steel sections according to current design standards

Öz

In recent years, using cold-formed steel members as structural and complementary structural elements has become very popular. The fact that these elements have thin wall thicknesses (t≤6 mm) due to their manufacturing characteristics makes the buckling and torsional strengths critical in designing these elements. In this study, the flexural strength of clawed C profiles used in the construction industry in our country will be calculated with TS EN 1993-1-3, AISI S100-16, and DSM. After determining the strengths of 72 selected profiles with these design methods, a comparison was made between them, and the performance of the methods was tested. The differences between the methods are shown on the graph.

Anahtar Kelimeler

• Cold formed steel
• Bending element
• Effective width Method
• Direct strength method

Güncel tasarım standartlarına göre soğukta şekil verilmiş çelik kesitlerin eğilme dayanımlarının hesabı

Öz

Son yıllarda soğuk şekil verilmiş çelik elemanların gerek taşıyıcı gerekse tamamlayıcı yapı elemanı olarak kullanımı oldukça popüler hale gelmiştir. Bu elemanların, imalat özelliği gereği ince et kalınlıklarına (t≤6 mm) sahip olması bu elemanların tasarımında burkulma ve burulma dayanımlarını kritik hale getirmektedir. Bu çalışmada ülkemiz inşaat sektöründe kullanıma sunulan tırnaklı C profillerin eğilme dayanımı TS EN 1993-1-3, AISI S100-16 ve DSM ile hesaplanacaktır. Seçilen 72 adet profilin bu tasarım yöntemleri ile dayanımları belirlendikten sonra aralarında karşılaştırılma yapılmış ve yöntemlerin performansı test edilmiştir. Yöntemler arasında oluşan farklar grafik üzerinde gösterilmiştir.

Anahtar Kelimeler

• Soğukta şekil verilmiş çelik
• Eğilme elemanı
• Efektif genişlik Metodu
• Doğrudan dayanım metodu

Kaynakça

1. K. Piyawat, C. Ramseyer and T.H.K. Kang, Development of an axial load capacity equation for doubly symmetric built-up cold-formed sections, Journal of Structural Engineering, 139(2), 789-803, 2013. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000780
2. T. Von Karman, E.E. Sechler and L. H. Donnell, The strength of thin plates in compression. Transactions of the American Society of Mechanical Engineers, 54(2), 53-56,1932. https://doi.org/10.1115/1.4021738
3. G. Winter, Strength of thin steel compression flanges, Transactions of the American Society of Civil Engineers, 112(1), 527-554, 1947. https://doi.org/10.1061/TACEAT.0006092
4. B.W. Schafer and T. Peköz, Direct strength prediction of cold-formed steel members using numerical elastic buckling solutions. 14th International Specialty Conference on Cold-Formed Steel Structures, pp 69-76, St. Louis, Missouri U.S.A, October 15-16, 1998.
5. TS EN 1993-1-3, Çelik yapıların projelendirilmesi- Bölüm 1-3: Genel kurallar- Soğukta biçimlendirilmiş ince ölçülü elemanlar ve saçla kaplama için. Türk Standartları Enstitüsü, Ankara, 2007.
6. AISI S100-16, North American Specification for the Design of Cold-Formed Steel Structural Members. American Iron and Steel Institute, Washington, DC, 2016.
7. EN 1993-1-3 (2006) (English): Eurocode 3: Design of steel structures- Part 1-3: General rules- Supplementary rules for cold-formed members and sheeting. 2006, The European Union Per Regulation: Brussels.
8. D. Dubina, V. Ungureanu and R. Landolfo, Design of Cold‐formed Steel Structures: Eurocode 3: Design of Steel Structures, European Convention for Constructional Steelwork, 2012.

9. C.D.Moen and B. W. Schafer, Direct Strength Method for Design of Cold-Formed Steel Columns with Holes, Journal of structural engineering, 137(5), 559-570, 2011. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000310
10. B.W. Schafer, Review: The Direct Strength Method of cold-formed steel member design. Journal of Constructional Steel Research, 64(7-8), 766-778, 2008. https://doi.org/10.1016/j.jcsr.2008.01.022
11. C. Yu and B.W. Schafer, Local buckling tests on cold-formed steel beams, Journal of structural engineering, 129(12),1596-1606,2003. https://doi.org/10.1061/(ASCE)0733-9445(2003)129:12(1596)
12. C. Yu and B.W. Schafer, Distortional buckling tests on cold-formed steel beams. Journal of structural engineering,132(4),515-528,2006. https://doi.org/10.1061/(ASCE)0733-9445(2006)132:4(515)
13. E.D. Batista, Local-global buckling interaction procedures for the design of cold-formed columns: Effective width and direct method integrated approach. Thin-Walled Structures, 47(11), 1218-1231, 2009. https://doi.org/10.1016/j.tws.2009.04.004
14. E.D. Batista, Effective section method: A general direct method for the design of steel cold-formed members under local-global buckling interaction. Thin-Walled Structures, 48(4-5), 345-356, 2010. https://doi.org/10.1016/j.tws.2009.11.003
15. P.B. Dinis and D. Camotim, Local/distortional mode interaction in cold-formed steel lipped channel beams. Thin-Walled Structures, 48(10-11), 771-785, 2010. https://doi.org/10.1016/j.tws.2010.01.005
16. L. Laim, J.P.C. Rodrigues, and L.S. da Silva, Experimental and numerical analysis on the structural behaviour of cold-formed steel beams. Thin-Walled Structures,72,1-13,2013. https://doi.org/10.1016/j.tws.2013.06.008
17. M. Anbarasu, Local-distortional buckling interaction on cold-formed steel lipped channel beams. Thin-Walled Structures, 98, 351-359, 2016. https://doi.org/10.1016/j.tws.2015.10.003
18. A.D. Martins et al., Distortional failure of cold-formed steel beams under uniform bending: Behaviour, strength and DSM design. Thin-Walled Structures, 118,196-213,2017. https://doi.org/10.1016/j.tws.2017.04.009
19. S.G. Fan et al., Experimental study and numerical simulation analysis of distortional buckling capacity of stainless steel lipped C-section beams. Engineering Structures,250,2022. https://doi.org/10.1016/j.engstruct.2021.113428
20. Johns Hopkins University, CUFSM (version 5.04) Finite strip elastic buckling analysis program,〈http://www.ce.jhu.edu/bschafer/cufsm/〉, 2020.