Seismic Performance Factors for Cold-Formed Steel Special Bolted Moment Frames
This article is a reply.
VIEW THE ORIGINAL ARTICLEThis article has a reply.
VIEW THE REPLYPublication: Journal of Structural Engineering
Volume 136, Issue 8
Abstract
The American Iron and Steel Institute (AISI) recently issued a standard on the seismic design of cold-formed steel special bolted moment frames (SBMF). It is expected that ductility is provided through bolt slippage and bearing in the moment connection region; both the beams and columns are to be designed based on the capacity design principles. This paper provides background information for the proposed seismic performance factors. Based on cyclic testing results, a value of 3.5 was proposed for the response modification coefficient, . A statistical evaluation through nonlinear time-history analysis, which considered the unique structural characteristics of this framing system, showed that the Newmark-Hall ductility reduction rule is conservative. Based on the analysis results, a revised rule was proposed, which resulted in a deflection amplification factor, , of . A design procedure in the AISI seismic standard allows the designer to directly calculate the maximum seismic force in the moment connection at the design story drift level, thereby an empirical system overstrength factor, , is unnecessary for the design of SBMFs.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
This research was sponsored by AISI. Additional funding was provided by the Japan Iron and Steel Federation to the first writer.
References
American Iron and Steel Institute (AISI). (2007). “Standard for seismic design of cold-formed steel structural systems—Special bolted moment frames.” S110-07, Washington, D.C.
ASCE. (2005). “Minimum design loads for buildings and other structures.” ASCE/SEI 7-05, American Society of Civil Engineering, Reston, Va.
Crawford, S. F., and Kulak, G. L. (1971). “Eccentrically loaded bolted connections.” J. Struct. Div., 97(ST3), 765–783.
Federal Emergency Management Agency (FEMA). (2003). “NEHRP recommended provisions for seismic regulations for new buildings and other structures.” FEMA 450, Washington, D.C.
Federal Emergency Management Agency (FEMA). (2009). “Quantification of building seismic performance factors.” FEMA P695, Washington, D.C.
Mitchell, D., Tremblay, R., Karacabeyli, E., Paultre, P., Saarcioglu, M., and Anderson, D. L. (2003). “Seismic force modification factors for the proposed 2005 edition of the National Building Code of Canada.” Can. J. Civ. Eng., 30(2), 308–327.
MLIT. (2008). The building standard law of Japan, The Ministry of Land, Infrastructure and Transport, Tokyo.
Newmark, N. M., and Hall, W. J. (1982). Earthquake spectra and design, Earthquake Engineering Research Institute, Berkeley, Calif.
OpenSees. (2006). “Open system for earthquake engineering simulation.” Pacific earthquake engineering center (PEER), University of California, Berkeley, Calif.
Sato, A., and Uang, C. M. (2008). “An ATC-63 study in support of the proposed system performance factors for AISI S110 standard for seismic design of cold-formed steel structures special bolted moment frames.” Rep. No. SSRP-08/10, Dept. of Structural Engineering, Univ. of California, San Diego.
Sato, A., and Uang, C. M. (2009). “Seismic design procedure development for cold-formed steel-special bolted moment frames.” J. Constr. Steel Res., 65, 860–868.
Uang, C. M. (1991). “Establishing (or ) and factors for building seismic provisions.” J. Struct. Eng., 117(1), 19–28.
Uang, C. M. (1993). “An evaluation of two-level seismic design procedure.” Earthquake Spectra, 9(1), 121–135.
Uang, C. M., Sato, A., Hong, J. K., and Wood, K. (2010). “Cyclic testing and modeling of cold-formed steel special bolted moment frame connections.” J. Struct. Eng., 136(8), 953–960.
Information & Authors
Information
Published In
Copyright
© 2010 ASCE.
History
Received: Feb 25, 2008
Accepted: Jan 20, 2010
Published online: Jan 22, 2010
Published in print: Aug 2010
Authors
Metrics & Citations
Metrics
Citations
Download citation
If you have the appropriate software installed, you can download article citation data to the citation manager of your choice. Simply select your manager software from the list below and click Download.