Bolted Connections in Cold-Formed Steel: Reliability Analysis for Rupture in Net Section
Publication: Journal of Structural Engineering
Volume 139, Issue 5
Abstract
This article presents 93 unpublished experimental results for rupture in the net section of bolted connections in cold-formed steel angles and channels. The article includes a study of the strength reduction coefficient in order to account for the shear lag effect. Predictions of connection strength by Brazilian and American design codes are considered. By comparing experimental results with design code predictions, model error (professional factor) statistics are evaluated. Model errors are incorporated in reliability analyses of typical connections to investigate their effects on connection safety. It is shown in the article that model errors have a significant impact on connection safety. Consideration of model errors leads to significant reductions in reliability indices, which are found to be less than the recommended target reliability levels. The model error statistics obtained herein are used to find the resistance factors that would be required to achieve the target reliability index in the design of bolted connections for net-section rupture. These factors are smaller than the current used in the American Iron and Steel Institute code. Other suggestions for improvement of the North American code are also presented.
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Acknowledgments
The authors kindly acknowledge financial support for this research project from the National Council for Research and Development (CNPq) and São Paulo State Foundation for Research (FAPESP).
References
American Iron and Steel Institute (AISI). (2007). “North American specification for the design of cold-formed steel structures members.” AISI S100-07, Washington, DC.
ASTM. (2009). “Standard specification for structural bolts, steel, heat treated 830 MPa minimum tensile strength (metric).” A325M-09, West Conshohocken, PA.
Associaçāo Brasileira de Normas Técnicas (ABNT). (2010). “Design of cold-formed steel structural members.” NBR 14762, Rio de Janeiro, Brazil (in Portuguese).
Beck, A. T. (2007). “Computer-aided teaching of structural reliability.” Proc., 28th Iberian Latin-American Congress on Computational Methods in Engineering, Brazilian Association of Computational Methods in Engineering, Porto, Portugal.
Beck, A. T., and Dória, A. S. (2008). “Reliability analysis of I-section steel columns designed according to new Brazilian building codes.” J. Braz. Soc. Mech. Sci. Eng., 30(2), 152–159.
Beck, A. T., Oliveira, W. L. A., De Nardin, S., and El Debs, A. L. H. C. (2009). “Reliability-based evaluation of design code provisions for circular concrete-filled steel columns.” Eng. Struct., 31(10), 2299–2308.
Beck, A. T., and Souza, A. C., Jr. (2010). “A first attempt towards reliability-based calibration of Brazilian structural design codes.” J. Braz. Soc. Mech. Sci. Eng., 32(2), 119–127.
Bolandim, E. A. (2011). “Reliability analysis in bolted connections in thin sheets and cold-formed steel members.” M.S. thesis, São Carlos School of Engineering, Univ. of São Paulo, São Paulo, Brazil (in Portuguese).
Chaves, I. A., Beck, A. T., and Malite, M. (2010). “Reliability-based evaluation of design guidelines for cold-formed steel-concrete composite beams.” J. Braz. Soc. Mech. Sci. Eng., 32, 442–449.
Easyfit 5.2 [Computer software]. Mathwave.
Ellingwood, B. R., and Galambos, T. V. (1982). “Probability-based criteria for structural design.” Struct. Safety, 1(1), 15–26.
Holcomb, B. D., Laboube, R. A., and Yu, W. W. (1995). “Tensile and bearing capacities of bolted connections.” Second Summary Rep., Dept. of Civil Engineering, Center for Cold-Formed Steel Structures, Univ. of Missouri-Rolla, Rolla, MO.
Kulak, G. L., and Wu, E. Y. (1997). “Shear lag in bolted angle tension members.” J. Struct. Eng., 123(9), 1144–1152.
Maiola, C. H. (2004). “Bolted connections in thin sheets and cold-formed steel members.” Doctoral thesis, São Carlos School of Engineering, Univ. of São Paulo, São Paulo, Brazil (in Portuguese).
Melchers, R. E. (1999). Structural reliability analysis and prediction, 2nd Ed., Wiley, New York.
Munse, W. H., and Chesson, E., Jr. (1963). “Riveted and bolted joints: Net section design.” J. Struct. Div., 89(1), 107–126.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 139 • Issue 5 • May 2013
Pages: 748 - 756
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Aug 26, 2011
Accepted: Dec 29, 2011
Published online: Apr 15, 2013
Published in print: May 1, 2013
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