Enhancement of Ductility of Existing Seismic Steel Moment Connections
Publication: Journal of Structural Engineering
Volume 127, Issue 5
Abstract
The fracture of beam-to-column connections of steel buildings in the Northridge and Kobe earthquakes generated concerns about the reliability of current design and construction technology for steel connections. The same type of fracturing may occur at similar beam-to-column connections of steel buildings in other seismically active areas. A simple method is proposed here to enhance the ductility of beam-to-column connections of existing buildings. By trimming the bottom flange of the beam slightly, the ductility of the connection can be greatly improved. Experimental studies of the newly designed connections under cyclic load show that the ultimate strengths are almost unaltered; however, the plastic rotational capacity can be increased significantly. When adopting the proposed method, the only work needed is to trim part of the bottom flange plate, and this can be done without removing the floor slab. The proposed connection method can be easily implemented to enhance the ductility of beam-to-column connections of existing buildings.
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References
1.
American Institute of Steel Construction (AISC). ( 1994). “Northridge steel update I.” Chicago.
2.
Applied Technology Council (ATC). ( 1992). “Guidelines for cyclic seismic testing of components of steel structures.” Rep. No. ATC-24, Redwood City, Calif.
3.
Chen, S. J., and Chen, G. K. ( 1990). “Fracture of steel beam to box column connections.” J. Chinese Inst. Engrg., Taipei, Taiwan, 16(3), 381–394.
4.
Chen, S. J., Chen, S. T., Yeh, C. H., and Chou, Z. L. ( 1996a). “Fracture of steel beam-to-column connections under severe earthquake and development of ductile connections.” Struct. Engrg., Taipei, Taiwan, 11(4), 19–37 (in Chinese).
5.
Chen, S. J., Chu, J. M., and Chou, Z. L. ( 1997). “Dynamic behavior of steel frames with beam flanges shaved around connection.” J. Constructional Steel Res., 42(1), 49–69.
6.
Chen, S. J., and Yeh, C. H. ( 1994). “Enhancement of ductility of steel beam-to-column connections for seismic resistance.” SSRC 1994 Tech. Session, Lehigh University, Bethlehem, Pa., 327–338.
7.
Chen, S. J., Yeh, C. H., and Chu, J. M. (1996b). “Ductile steel beam-to-column connections for seismic resistance.”J. Struct. Engrg., ASCE, 122(11), 1292–1299.
8.
Engelhardt, M. D., and Husain, A. S. (1993). “Cyclic-loading performance of welded flange-bolted web connections.”J. Struct. Engrg., ASCE, 119(12), 3537–3550.
9.
Plumier, A. ( 1994). “Behavior of connection.” J. Constructional Steel Res., 29, 95–119.
10.
SAC Joint Venture (SAC). ( 1995a). “Background reports: Metallurgy, fracture mechanics, welding, moment connections and frame systems behavior.” Rep. No. SAC-95-09, Federal Emergency Management Agency, Sacramento, Calif.
11.
SAC Joint Venture (SAC). ( 1995b). “Interim guidelines: Evaluation, repair, modification and design of steel moment frames.” Rep. No. SAC 95-02, Federal Emergency Management Agency, Sacramento, Calif.
12.
SAC Joint Venture (SAC). ( 1997). “Connection test summaries.” Rep. No. SAC-96-02-09, Federal Emergency Management Agency, Sacramento, Calif.
13.
Toyoda, M. ( 1995). “How steel structures failed in Japan's great earthquake.” Welding J., 74(Dec.), 31–41.
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Received: Feb 17, 1999
Published online: May 1, 2001
Published in print: May 2001
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