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عنوان فارسی مقاله:
کاربرد و دقت روش طراحی آتش تیرهای فولاد سرد باز
عنوان انگلیسی مقاله:
On the applicability and accuracy of fire design methods for open cold-formed steel beams
سال انتشار : 2016
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مقدمه انگلیسی مقاله:
1. Introduction
Cold-formed steel (CFS) members under high levels of compression may easily exhibit local (wall transverse bending only), distortional (both wall transverse bending and cross-section distortion) and global (lateral-torsional) buckling [1–4]. Local buckling is particularly prevalent and is characterised by the relatively short wavelength buckling of individual plate elements. Distortional buckling involves both translation and rotation at the compression flange/lip fold line of the member [5]. These special buckling modes are the most interesting and complex subjects within this research field. Beyond them, interactive buckling modes between or among the above ones are the most frequently in the CFS flexural members. This is why, the strength calculations of cold-formed steel members are carried out at several levels of complexity depending on the purpose of its use. For the standardised design of flexural members at ambient temperature the Effective Width Method (EWM) and the recently developed Direct Strength Method (DSM) [6] may be applied. The EWM is formally available in the EN 1993-1.3:2004 [7], EN 1993-1.5:2006 [8] and in the AISI S100-1996 [9], whereas the DSM is available in the Appendix 1 of the North American Specification [10] and the Australia/ New Zealand Standard [11]. The EWM, introduced by Von Kármán et al. in 1932 [12], performs a reduction of the plates that comprise a cross-section based on the stability of the individual plates for the prediction of the local buckling strength. It is noticed that this method is a semi-empirical calibrated formulation which takes into account the local buckling effects for thin-walled sections, but does not have sufficient procedures for predicting the distortional buckling failure. However, the EN 1993- 1.3:2004 [7] provides specific provisions for the distortional buckling strength of CFS flexural members. This method adopted in the Eurocode considers the distortional buckling by using a reduced thickness in the calculation of the effective area of the edge stiffener and the distorted part of the compression flange. The reduction factor of thickness for distortional buckling depends among other parameters on the elastic buckling stress of the edge stiffener and the material yield strength. On the other hand, the DSM was initially proposed by Schafer and Peköz in 1998 [13] and it is based on the member elastic stability in contrast to the EWM. The essential difference between these two methods is therefore the replacement of plate stability by member stability. First, all elastic instability loads (or moments) for the gross cross-section should be determined (local, distortional and global buckling mode) as well as the load (or moment) that causes the section to yield. Then the member strength can be directly determined by predicting the load (or moment) capacities separately for global,
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کلمات کلیدی:
Optimum design of cold-formed steel beams using ... - ResearchGate https://www.researchgate.net/.../295684595_Optimum_design_of_cold-formed_steel_be... Applying optimisation techniques to the design of cold-formed steel (CFS) .... Published by Elsevier Ltd. This is an open access article under the CC BY license. A STUDY ON COLD FORMED STEEL BEAMS-A REVIEW (PDF ... https://www.researchgate.net/.../280831133_A_STUDY_ON_COLD_FORMED_STEEL... A STUDY ON COLD FORMED STEEL BEAMS- A REVIEW. By. M. ADIL ... Keywords: Cold Formed Steel, Buckling, Special Design Criteria, Innovative Sectional Profiles. ... Open cold formed. steel .... and constrained finite strip methods.” Proc. [PDF]review: the direct strength method of cold-formed steel member design https://pdfs.semanticscholar.org/3d10/b43ac205dafe577807462046901b8fcf9956.pdf by BW Schafer - Cited by 315 - Related articles The development of the Direct Strength Method for beams and columns, including the ... Currently, two basic design methods for cold-formed steel members are formally ...... “Buckling mode decomposition of single-branched open cross-. Cold-Formed Steel Design - Google Books Result https://books.google.com/books?isbn=0470919760 Wei-Wen Yu, Roger A. LaBoube - 2010 - Technology & Engineering The current design methods for beams, columns, and beamcolumns are ... of open sections is proportional to t3, cold-formed steel sections consisting of thin ... [PDF]Extending Direct Strength Design to Cold-formed Steel Beams with ... scholarsmine.mst.edu/cgi/viewcontent.cgi?article=1294&context=isccss by CD Moen - 2010 - Cited by 7 - Related articles Strength Method (DSM) to cold-formed steel beams with holes is nearly in ... are manufactured by cold bending steel sheet into an open cross-section, most. Searches related to design methods for open cold-formed steel beams design of cold formed steel structures pdf download cold formed steel beam design example cold formed steel design spreadsheet what is direct strength method direct strength method design guide cold formed steel column design cufsm manual direct strength method example
