Cyclic Behavior of Steel Wide-Flange Columns Subjected to Large Drift
Publication: Journal of Structural Engineering
Volume 134, Issue 8
Abstract
During an earthquake, steel braced frame columns can be subjected to high axial forces combined with inelastic rotation demand resulting from story drift. Cyclic testing of nine full-scale W14 column specimens representing a practical range of flange and web width-to-thickness ratios were subjected to different levels of axial force demand (35, 55, and 75% of nominal axial yield strength) combined with up to 10% story drift. No global buckling was observed in all test specimens. Flange local buckling was the dominant buckling mode. Specimens achieved interstory drift capacities of 0.07– . These large deformation capacities were, in part, achieved due to the delay in flange local buckling resulting from the stabilizing effect provided by the stocky column web of the W14 section specimens. Testing indicated that the ASCE 41 predicted plastic rotation capacities are very conservative. The ASCE 41 criteria do not specify plastic rotation capacity at axial load ratios greater than 0.5; however, tested specimens exhibited significant plastic rotation capacities of approximately 15–25 times the member yield rotation.
Get full access to this article
View all available purchase options and get full access to this article.
Acknowledgments
Funding for this project was provided by the American Institute of Steel Construction; Mr. Tom Schlafly was the project manager. Materials were donated by the Nucor-Yamato Steel Company and Mittal Steel. Fabrication was donated by the Schuff Steel Company.
References
American Institute of Steel Construction (AISC). (2005a). “Seismic provisions for structural steel buildings.” ANSI/AISC 341-05, AISC, Chicago.
American Institute of Steel Construction (AISC). (2005b). “Specification for structural steel buildings.” ANSI/AISC 360-05, AISC, Chicago.
ASCE. (2007). “Seismic rehabilitation of existing buildings.” ASCE 41, ASCE, Reston, Va.
Federal Emergency Management Agency (FEMA). (2000). “Recommended seismic design criteria for new steel moment-frame buildings.” FEMA 350, FEMA, Washington, D.C.
Krawinkler, H., Gupta, A., Medina, R., and Luco, N. (2000). “Loading histories for seismic performance testing of SMRF components and assemblies.” Rep. No. SAC/BD-00/10, SAC Joint Venture, Sacramento, Calif.
Krawinkler, H., Medina, R., and Alavi, B. (2003). “Seismic drift and ductility demands and their dependence on ground motions.” Eng. Struct., 25(5), 637–653.
Lopez, W., and Sabelli, R. (2004). Seismic design of buckling-restrained braced frames, Structural Steel Education Council Technical Information & Product Services, Moraga, Calif.
Medina, R. A. (2003). “Seismic demands for nondeteriorating frame structures and their dependence on ground motions.” Ph.D. dissertation, Dept. of Civil and Environmental Engineering, Stanford Univ., Palo Alto, Calif.
Newell, J., and Uang, C. M. (2006). “Cyclic behavior of steel columns with combined high axial load and drift demand.” Rep. No. SSRP-06/22, Dept. of Structural Engineering, Univ. of California, San Diego, La Jolla, Calif.
Prakash, V., Powell, G. H., and Campbell, S. (1993). “DRAIN-2DX: Base program description and user guide.” Rep. No. UCB/SEMM-93/17, Dept. of Civil Engineering, Univ. of California, Berkeley, Calif.
Richards, P., and Uang, C. M. (2006). “Testing protocol for short links in eccentrically braced frames.” J. Struct. Eng., 132(8), 1183–1191.
Sabelli, R. (2001). “Research of improving the design and analysis of earthquake-resistant steel-braced frames.” 2000 NEHRP Professional Fellowship Rep., Earthquake Engineering Research Institute, Oakland, Calif.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 8 • August 2008
Pages: 1334 - 1342
Copyright
© 2008 ASCE.
History
Received: Oct 11, 2007
Accepted: Dec 27, 2007
Published online: Aug 1, 2008
Published in print: Aug 2008
Notes
Note. Associate Editor: Judy Liu
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.