Extension of direct strength method to two dimensional cold formed steel frame
Abstract
The use of cold-formed marco de acero (CFS) structures is increasing due to the advances in manufacturing, construction technologies and relevant standards. CFS has many advantages. However, the design of CFS structures is complex because of their thin walled open sections making them vulnerable to torsional-flexural buckling and local buckling. Direct strength method (DSM) is the method available for individual beam and column, with certain limitations. To overcome one such limitation this paper attempts to find a formula as an extension to DSM. Already experimented frame was used to validate software model and same frame with different heights was analysed by Finite Element Method and DSM and a formula is obtained as an extension to DSM.
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References
Research Papers from Journals.
Bajoria, K. M., Talikoti, R. S. (2006), “Determination of fexibility of beam-to-column connectors used in thin walled cold-formed steel pallet racking systemsâ€, Journal of Thin-Walled Structures, Vol. 44, Pages 372-380.
Bajoria, K. M. Sangle K. K., Talikoti, R. S. (2011), “Stability and Dynamic Analysis of Cold-Formed Storage Rack Structures with Semirigid Connectionsâ€, Journal of Thin-Walled Structures, Vol. 44, Pages 372-380.
Bogdan, M. Put, Yong-Lin Pi, N. S. Trahair, Member, ASCE (1999). “Lateral Buckling Tests on Cold-Formed Channel Beams†J. Struct. Eng. 1999.125:532-539.
Bogdan M. Put, Yong-Lin Pi, N. S. Trahair, Member, ASCE (1999). “Bending and Torsion of Cold-Formed Channel Beamsâ€, J. Struct. Eng.125:504-546; 1999.
Ellifrit D., Sputo T., Haynes J. (1991), Flexural strength and deflections of discretely braced cold formed steel channel and zee sections. Project report, American Iron and Steel Institute.
Ellifrit D. et al. (1992), Flexural capacity of discretely braced C’s and Z’s. In: Yu W-W, LaBoube RA, editors. Proceedings of the Eleventh International Specialty Conference on Cold-Formed Steel Structures. St Louis, MO: Department of Civil Engineering, University of Missouri — Rolla, 108–29.
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Moen, C. D. (2008), "Direct Strength Design for Cold-Formed Steel Members with Perforations". Ph.D. Thesis, Johns Hopkins University, Baltimore.
Moen, C. D., Schafer B. W. (2011), “Direct strength design method for design of cold formed column with holesâ€, Journal of Structural Engineering, Vol. 137, No. 5, May 1, 2011 ©ASCE.
Pi, Y. L., Trahair N. S. (1994), Nonlinear inelastic analysis of steel beam-columns. I: Theory. Journal of Structural Engineering, 120(7):2041–61; ASCE.
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Put B. M., Pi Y-L, Trahair N. S. (1998) Lateral buckling tests on cold-formed channel beams. Research report no. R767, Center for Advanced Structural Engineering, Department of Civil Engineering, the University of Sydney, Australia.
Schafer, B. W. (2006) "Direct Strength Method Design Guideâ€, American Iron and Steel Institute, Washington, D.C. 171 pages.
Schafer B. W., Moen C. D. (2010), “Extending Direct Design to Cold Formed Steel Beams with Holesâ€. Twentieth International Specialty Conference on Cold-Formed Steel Structures St. Louis, Missouri, USA.
Schafer B. W., (2006) "Review: The Direct Strength Method of Cold Formed Steel Member" Stability and Ductility of Steel Structures. Lisbon, Portugal.
Thombare C. N., Sangle K. K. And Mohitkar V. M. (2016) Nonlinear buckling analysis of 2D cold formed storage simple cross aisle frames. Journal of building Engineering, Vol 7(2016), 12-22.
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Books.
Yu, W.W. Cold-Formed Steel Design. John Wiley & Sons, Inc; 2000.
Standards.
American Iron and Steel Institute (1996,. AISI Specification for the Design of Cold-Formed Steel Structural Members. American Iron and Steel Institute. Washington, D.C.;
AS 4100 Australian Standard Steel Structures, (Standards Association of Australia).
RMI, Specification for the design, testing and utilization of industrial storage racks, Rack Manufacturers Institute, 2008.
North American Specification (2004), “Appendix 1: Design of Cold-Formed Steel Structural Members Using the Direct Strength Method.†Supplement to the North American Specification for the Design of Cold-Formed Steel Structures. American Iron and Steel Institute, Washington, DC; 2004.
Softwares.
Appropriate commercial software for FEM.
CUFSM version 4.05 – A general purpose cold formed steel component design software based on North American Standards
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