Interaction of Local, Flexural-Torsional, and Flexural Buckling in CFS Lipped Angle Compression Members
Publication: Journal of Structural Engineering
Volume 149, Issue 7
Abstract
The possible failure modes of cold-formed steel (CFS) lipped angle (LA) compression members are yielding, local, flexural torsional, or flexural buckling, and any possible interaction among these buckling modes. In general, the strength estimated by current design guidelines are conservative for these members when flexural-torsional buckling (FTB) is the first global buckling mode because the postbuckling strength of this mode is not accounted for in the global buckling strength equations. The initial part of this paper reports the results of an experimental and numerical study of CFS-LA members undergoing independent FTB. Modifications are suggested to global buckling strength equations based on these results. Subsequently, the reduction in the ultimate strength from strength corresponding to independent buckling modes for LA members undergoing interaction between buckling modes such as local-flexural torsional, flexural-flexural torsional, local-flexural, and local-flexural torsional-flexural are studied systematically using finite-element analysis results. A simple and more accurate interaction equation that accounts for these interactions among buckling modes in CFS-LA compression members is proposed.
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Data Availability Statement
Data generated or analyzed during the study are available from the corresponding author by request.
Acknowledgments
The first author acknowledges the financial support provided by the Ministry of Human Resource Development (MHRD), India. This study was funded by Science Engineering and Research Board (SERB) Research Grant (CRG/2018/001969) from the Department of Science and Technology (DST), Government of India. The second author would like to acknowledge the financial assistance received from this project. The authors also thankfully acknowledge the assistance of Mr. Babu Kumar B and Ms. Siji S. Saju during the experimental program at the Indian Institute of Technology Palakkad, Kerala.
References
ABAQUS. 2020. ABAQUS standard user’s manual, ABAQUS 2020. Providence, RI: Dassault Systemes Simulia.
AISI (American Iron and Steel Institute). 2020. North American specification for the design of cold-formed steel structural members. Washington, DC: AISI.
AS/NZS (Australian/New Zealand Standard). 2018. Cold-formed steel structures. Sydney, Australia: AS/NZS.
ASTM. 2009. Standard test methods for tension testing of metallic materials. West Conshohocken, PA: ASTM.
CEN (European Committee for Standardization). 2006. Eurocode 3: Design of steel structures, part 1-5: Plated structural elements. Brussels, Belgium: CEN.
Dinis, P., D. Camotim, A. Landesmann, and A. Martins. 2021. Proposal to improve the DSM design of cold-formed steel fixed-ended columns failing in global modes. Berlin: Springer.
Dinis, P. B., and D. Camotim. 2019. “Proposal to improve the DSM design of cold-formed steel angle columns: Need, background, quality assessment, and illustration.” J. Struct. Eng. 145 (8): 04019071. https://doi.org/10.1061/(ASCE)ST.1943-541X.0002342.
Dinis, P. B., D. Camotim, A. Landesmann, and A. D. Martins. 2019. “On the direct strength method design of columns against global failures.” Thin-Walled Struct. 139 (Jun): 242–270. https://doi.org/10.1016/j.tws.2019.02.027.
Dinis, P. B., D. Camotim, A. Landesmann, and A. D. Martins. 2020a. “Improving the direct strength method prediction of column flexural-torsional failure loads.” Thin-Walled Struct. 148 (Sep): 106461. https://doi.org/10.1016/j.tws.2019.106461.
Dinis, P. B., D. Camotim, A. D. Martins, and A. Landesmann. 2020b. “Global-global interaction in cold-formed steel channel columns: Relevance, post-buckling behavior, strength and DSM design.” In Proc., SSRC 2020 Annual Stability Conf. Chicago: American Institute of Steel Construction.
Ellobody, E., and B. Young. 2005. “Behavior of cold-formed steel plain angle columns.” J. Struct. Eng. 131 (3): 457–466. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:3(457).
Gunalan, S., and M. Mahendran. 2013. “Improved design rules for fixed ended cold-formed steel columns subject to flexural–torsional buckling.” Thin-Walled Struct. 73 (Jun): 1–17. https://doi.org/10.1016/j.tws.2013.06.013.
Huang, Y., and B. Young. 2014. “The art of coupon tests.” J. Constr. Steel Res. 96 (Apr): 159–175. https://doi.org/10.1016/j.jcsr.2014.01.010.
Kumar, M. A., and V. Kalyanaraman. 2012. “Design strength of locally buckling stub-lipped channel columns.” J. Struct. Eng. 138 (11): 1291–1299. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000575.
Kumar, M. A., and V. Kalyanaraman. 2014. “Distortional buckling of CFS stiffened lipped channel compression members.” J. Struct. Eng. 140 (12): 04014099. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001027.
Kumar, M. A., and V. Kalyanaraman. 2018. “Interaction of local, distortional, and global buckling in CFS lipped channel compression members.” J. Struct. Eng. 144 (2): 04017192. https://doi.org/10.1061/(ASCE)ST.1943-541X.0001935.
Kwon, Y. B., and G. J. Hancock. 1992. “Tests of cold-formed channels with local and distortional buckling.” J. Struct. Eng. 118 (7): 1786–1803. https://doi.org/10.1061/(ASCE)0733-9445(1992)118:7(1786).
Lau, S. C., and G. J. Hancock. 1987. “Distortional buckling formulas for channel columns.” J. Struct. Eng. 113 (5): 1063–1078. https://doi.org/10.1061/(ASCE)0733-9445(1987)113:5(1063).
Maia, W. F., J. M. Neto, and M. Malite. 2008. “Stability of cold-formed steel simple and lipped angles under compression.” In Proc., 19th Int. Specialty Conf. on Cold-Formed Steel Structures, 111–125. Rolla, MO: Univ. of Missouri-Rolla.
Popovic, D., G. J. Hancock, and K. J. Rasmussen. 1999. “Axial compression tests of cold-formed angles.” J. Struct. Eng. 125 (5): 515–523. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:5(515).
Schafer, B. 2002. “Local, distortional, and Euler buckling of thin-walled columns.” J. Struct. Eng. 128 (3): 289–299. https://doi.org/10.1061/(ASCE)0733-9445(2002)128:3(289).
Schafer, B., and T. Peköz. 1998. “Computational modeling of cold-formed steel: Characterizing geometric imperfections and residual stresses.” J. Constr. Steel Res. 47 (3): 193–210. https://doi.org/10.1016/S0143-974X(98)00007-8.
Schafer, B. W., and S. Ádány. 2006. “Buckling analysis of cold-formed steel members using CUFSM: Conventional and constrained finite strip methods.” In Proc., 18th Int. Specialty Conf. on Cold-Formed Steel Structures, 39–54. Rolla, MI: Missouri Univ. of Science and Technology.
Shifferaw, Y., and B. Schafer. 2014. “Cold-formed steel lipped and plain angle columns with fixed ends.” Thin-Walled Struct. 80 (Sep): 142–152. https://doi.org/10.1016/j.tws.2014.03.001.
Young, B. 2004. “Tests and design of fixed-ended cold-formed steel plain angle columns.” J. Struct. Eng. 130 (12): 1931–1940. https://doi.org/10.1061/(ASCE)0733-9445(2004)130:12(1931).
Young, B. 2005. “Experimental investigation of cold-formed steel lipped angle concentrically loaded compression members.” J. Struct. Eng. 131 (9): 1390–1396. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:9(1390).
Young, B., and E. Ellobody. 2005. “Buckling analysis of cold-formed steel lipped angle columns.” J. Struct. Eng. 131 (10): 1570–1579. https://doi.org/10.1061/(ASCE)0733-9445(2005)131:10(1570).
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 149 • Issue 7 • July 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Jun 21, 2022
Accepted: Jan 10, 2023
Published online: Apr 18, 2023
Published in print: Jul 1, 2023
Discussion open until: Sep 18, 2023
ASCE Technical Topics:
- Analysis (by type)
- Buckling
- Cold-formed steel
- Compression members
- Continuum mechanics
- Dynamics (solid mechanics)
- Engineering fundamentals
- Engineering materials (by type)
- Engineering mechanics
- Flexural strength
- Forces (type)
- Material mechanics
- Material properties
- Materials engineering
- Metals (material)
- Numerical analysis
- Solid mechanics
- Steel
- Strength of materials
- Structural behavior
- Structural dynamics
- Structural engineering
- Structural members
- Structural strength
- Structural systems
- Tensile strength
- Torsion
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