Stability Requirements for Beams in Seismic Steel Moment Frames
Publication: Journal of Structural Engineering
Volume 132, Issue 9
Abstract
An analytical study was conducted on the cyclic loading behavior of beams in steel moment frames. Lateral–torsional buckling and local buckling were explicitly considered in the analysis. Beam cross-sectional dimensions were varied to represent a wide range of rolled wide flange shapes. The unbraced length of the beams corresponded to slenderness ratios about the weak axis ranging between 60 and 100. Based on the analyses, flange and web width-thickness limits were established that would permit the beam to achieve various target rotation capacities. These limits are presented in terms of limit curves which plot the flange width-thickness ratio against the web width-thickness ratio. The limit curves clearly show strong flange–web interaction. Different limit curves were developed for a range of target rotation angles, weak axis slenderness ratios, and residual strength levels. Postbuckling behavior and strength degradation mechanism were studied. The results of the analyses are compared against current building code requirements for beam stability in seismic steel moment frames, and the adequacy of the current code requirements are evaluated.
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Acknowledgments
The writers gratefully acknowledge funding provided by the Japanese Ministry of Education, Culture, Sports, Science, and Technology (Base Research Category S: No. UNSPECIFIED14102028). The second writer expresses gratitude for the sponsorship provided by the Twenty-First Century Center of Excellence (COE) Program awarded to the Disaster Prevention Research Institute, Kyoto University. The opinions expressed in this paper are those of the writers and do not necessarily reflect the views of the sponsors.
References
AISC. (2005a). Seismic provisions for structural steel buildings, ANSI/AISC 341-05, Chicago.
AISC. (2005b). Specification for structural steel buildings, ANSI/AISC 360-05 Chicago.
Architectural Institute of Japan (AIJ). (1995). Reconnaissance Rep. on the Damage to Steel Building Structures Observed from the 1995 Hyogoken-Nanbu Earthquake, Kinki Branch of the AIJ, Steel Committee, Osaka, Japan (in Japanese with attached abridged English version).
ASCE. (1971). Plastic design in steel: A guide and commentary, 2nd Ed., ASCE Manuals and Reports on Engineering Practice No. 41, New York.
Bertero, V. V., Anderson, J. C., and Krawinkler, H. (1994). “Performance of steel building structures during the Northridge Earthquake.” Rep. UBC/EERC-94/09, Univ. of California at Berkeley, Berkeley, Calif.
Federal Emergency Management Agency (FEMA). (2000). “Recommended seismic design criteria for new steel moment-frame buildings.” Publication No. FEMA-350, Washington, D.C.
Liu, D., Nakashima, M., and Kanao, I. (2003). “Behavior to complete failure of steel beams subjected to cyclic loading.” Eng. Struct., 25(5), 525–535.
MSC Software Japan Ltd. (2003). MSC. MARC online manual, Tokyo, Japan (in Japanese).
Nakashima, M., Kanao, I., and Liu, D. (2002). “Lateral instability and lateral bracing of steel beams subjected to cyclic loading.” J. Struct. Eng., 128(10), 1308–1316.
Nakashima, M., Liu, D., and Kanao, I. (2003). “Lateral–torsional and local instability of steel beams subjected to large cyclic loading.” Int. J. Steel Struct., 3(3), 179–189.
Nakashima, M., Roeder, C. W., and Maruoka, Y. (2000). “Steel moment frames for earthquakes in United States and Japan.” J. Struct. Eng., 126(8), 861–868.
Nakashima, M., Suita, K., Morisako, K., and Maruoka, Y. (1998). “Test of welded beam-to-column subassemblages. I: Global behavior.” J. Struct. Eng., 124(11), 1236–1244.
Uang, C.-M., and Fan, C.-C. (2001). “Cyclic instability criteria for steel moment connections with reduced beam sections.” J. Struct. Eng., 127(9), 1021–1027.
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© 2006 American Society of Civil Engineers.
History
Received: Oct 28, 2004
Accepted: Nov 29, 2005
Published online: Sep 1, 2006
Published in print: Sep 2006
Notes
Note. Associate Editor: Marc I. Hoit
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