Moment modification factors for the buckling design of steel beams – new recommendations
Email:
phe.phamvan@utc.edu.vn
Từ khóa:
buckling, flexural steel member, moment modification factor, standard, numerical solution, thin walled beams
Tóm tắt
When a unbraced flexural steel beam is subjected to a ununiform moment distribution, a simplified moment modification factor (denoted as Cb) should be evaluated for the design of the buckling resistance of that member. However, typical standards for the buckling design of steel structures (e.g., American AISC A360, Australian AS-4100, Canadian CSA S16, Eurocode 3 and Japanese standards) currently recommend different design equations for the factor. Also, such equations are based on simplified expressions those are not exact solutions. Thus, the present study firstly revise the standard equations to discuss their advantages and disadvantages in application. Also, a numerical solution based on a finite element analysis package is then conducted in the present study to predict the Cb factor. The numerical solution is successfully validated against available research results. Based on the comparison of the modification factors between of the present numerical study and those based on the design standards, it is observed that the modification factors based on the current design standards maybe not safety enough to predict the buckling resistances in several loading cases. The present study finally recommends a new modification more on the safe side for the Cb factor to ensure a conservative designTài liệu tham khảo
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[2]. CSA S16, Limit states design of steel structures, Standard CAN/CSA-S16-14, Canadian Standards Association, Mississauga, Ontario, 2014. https://www.csagroup.org/store/product/S16-14/
[3]. Standards Australia. AS-4100 1998. AS-4100 Steel Structures, Sydney, Australia, 1998 https://store.standards.org.au/product/as-4100-1998
[4]. EN 1993-1-1:2005 (E): Eurocode 3: design of steel structures—part 1–1: general rules and rules for buildings, CEN, 2005. https://www.phd.eng.br/wp-content/uploads/2015/12/en.1993.1.1.2005.pdf
[5]. Japan Society of Civil Engineers (JSCE) - Standard Specifications for Steel and Composite Structures, 2009. https://www.jsce-int.org/system/files/Standard.pdf
[6]. TCVN 5575-2018, Steel structures – Design standard, Vietnam institute for Building Science and Technology (INST), 2018. https://tieuchuan.vsqi.gov.vn/tieuchuan/view?sohieu=TCVN+5575%3A2012
[7]. J. W. S. Hermanus, Comparative study of the equivalent moment factor between international steel design specifications, Master thesis, University of Stellenbosch, 2014. https://scholar.sun.ac.za/handle/10019.1/95863
[8]. D. Bresser, G. J. P. Ravenshorst, P. C. J. Hoogenboom, General formulation of equivalent moment factor for elastic lateral torsional bucklingof slender rectangular sections and I-sections, Engineering Structures, 207 (2020) 110230. https://doi.org/10.1016/j.engstruct.2020.110230
[9]. M. Manarin, R. G. Driver, Y. Li, Moment gradient factor for lateral torsional buckling of T-shaped beams, Proceeding of the Annual Stability Conference, Missouri, 2019. https://www.aisc.org/globalassets/continuing-education/ssrc proceedings/2019/manarin_et_al_ssrc_2019.pdf
[10]. M. Secer, E. T. Uzun, Elastic lateral torsional buckling of simply supported beams under the combination of concentrated load and linear moment gradient, IOP Conf. series: Materials Science and Engineering, 245, 2017.https://iopscience.iop.org/article/10.1088/1757-899X/245/3/032077
[11]. P. A. Kirby, D. A. Nethercot, Design for Structural Stability, John Wiley Sons, Australia, 1979. https://www.amazon.com/Design-Structural-Stability-P-Kirby/dp/0003830462
[12]. H. Cao, D. T. Nguyen, V. P. Pham, T. T. Bui, D. B. Nguyen, Comparison of inelastic moment resistances of rolled steel beams based on different specifications and a numerical study, Transport and Communications science journal, 73(2022) 16-30. https://doi.org/10.47869/tcsj.73.1.2
[13]. D. A. Nethercot, N. S. Trahair, Lateral Buckling Approximations for Elastic Beams, The Structural Engineer, 54 (1976) 197-204. https://trid.trb.org/view/66407
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Nhận bài
02/10/2022
Nhận bài sửa
28/11/2022
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05/01/2023
Xuất bản
15/01/2023
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Kiểu trích dẫn
Tien Nguyen, D., & Phe Van, P. (1673715600). Moment modification factors for the buckling design of steel beams – new recommendations. Tạp Chí Khoa Học Giao Thông Vận Tải, 74(1), 10-19. https://doi.org/10.47869/tcsj.74.1.2
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