Slab Effects in SMRF Retrofit Connection Tests
Publication: Journal of Structural Engineering
Volume 127, Issue 3
Abstract
A series of six full-scale subassemblages were tested to investigate dogbone and haunch retrofits for pre-Northridge steel moment connections. Tests included matched pairs of specimens, one bare steel and one including composite slab. Data were collected to evaluate the influence and behavior of the concrete slab. Results that emphasize the influence of the composite slab on connection behavior and specific comments on the slab response are presented. The presence of a composite slab corresponded to higher-achieved overall plastic rotations and higher-peak attained moments. Existing estimates of composite beam capacity overestimated the specimen strengths in positive moment. Shear stud failures were observed, raising concerns about the capacity of shear studs under severe reversed cyclic loading.
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References
1.
American Institute of Steel Construction (AISC). ( 1994). Manual of steel construction load and resistance factor design, 2nd Ed., Chicago.
2.
American Welding Society (AWS). ( 1996). AWS D1.1-96: Structural welding code—steel, Miami.
3.
Applied Technology Council (ATC). ( 1992). ATC-24: Guidelines for seismic testing of components of steel structures, Redwood, Calif.
4.
Civjan, S. A., Engelhardt, M. D., and Gross, J. L. (2000). “Retrofit of pre-Northridge moment-resisting connections.”J. Struct. Engrg., ASCE, 126(4), 445–452.
5.
Du Plessis, D. P., and Daniels, J. H. ( 1972). “Strength of composite beam to column connections.” Rep. No. 374.3, Fritz Engineering Lab., Lehigh University, Bethlehem, Pa.
6.
Engelhardt, M. D., and Venti, M. ( 1999). “Unpublished preliminary test reports for SAC phase 2 tests.” University of Texas at Austin, Austin, Tex.
7.
Fry, G. ( 1999). Unpublished preliminary test reports for SAC phase 2 tests, Texas A&M University, College Station, Tex.
8.
Gross, J. L., Engelhardt, M. D., Uang, C. M., Kasai, K., and Iwankiw, N. R. ( 1999). “Modification of existing welded steel moment frame connections for seismic resistance.” Steel Design Guide Series, No. 12, American Institute of Steel Construction, Chicago.
9.
Hajjar, J. F., Leon, R. T., Gustafson, M. A., and Shield, C. K. (1998). “Seismic response of composite moment-resisting connections. II: Behavior.”J. Struct. Engrg., ASCE, 124(8), 877–885.
10.
Lee, S. J., and Lu, L. W. (1989). “Cyclic tests of full-scale composite joint subassemblages.”J. Struct. Engrg., ASCE, 115(8), 1977–1998.
11.
Leon, R. T., Hajjar, J. F., and Gustafson, M. A. (1998). “Seismic response of composite moment-resisting connections. I: Performance.”J. Struct. Engrg., ASCE, 124(8), 868–876.
12.
Strategic Air Command. (SAC) Joint Venture. ( 1995). “Interim guidelines: Evaluation, repair, modification, and design of welded steel moment frame structures.” Report No. FEMA 267, Federal Emergency Management Agency, Washington, D.C.
13.
Tagawa, Y., Kato, B., and Aoki, H. (1989). “Behavior of composite beams in steel frame under hysteretic loading.”J. Struct. Engrg., ASCE, 115(8), 2029–2045.
14.
Uang, C. M., Yu, Q. S., and Noel, S. ( 1998). “Rehabilitating preNorthridge steel moment frame connections: RBS and haunch approaches considering slab effects.” Proc., 6th U.S. Nat. Conf. Earthquake Engrg., Earthquake Engineering Research Institute, San Francisco.
15.
Youssef, N., Bonowitz, D., and Gross, J. L. ( 1995). “A survey of steel moment-resisting frame buildings affected by the 1994 Northridge earthquake.” NIST Rep. No. NISTIR 5625, National Institute of Standards and Technology, U.S. Dept. of Commerce Technology Administration, Washington, D.C.
Information & Authors
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Published In
Journal of Structural Engineering
Volume 127 • Issue 3 • March 2001
Pages: 230 - 237
History
Received: Nov 8, 1999
Published online: Mar 1, 2001
Published in print: Mar 2001
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