Evaluation of Sloped RBS Moment Connections
Publication: Journal of Structural Engineering
Volume 142, Issue 6
Abstract
AISC 358 provides steel connections that are prequalified for use in special and intermediate moment frames (SMF and IMF). Implicit in this standard is that the beam and column are orthogonal to each other in the elevation of the frame. To evaluate the effects of a sloped connection considering an angle of deviation from orthogonal of 28°, two reduced beam section (RBS) moment connections with beam and column were cyclically tested. Although both specimens met the acceptance criteria of AISC 341, brittle fracture of top flange weld soon followed, a failure mode not typical of an RBS connection. Finite-element analysis demonstrated that the strain demand was not symmetric between two flanges. The strain demand at the heel location was higher than that at the opposite flange and increased with the angle of the slope. The AISC 341 welding requirement for steel backing removal, back-gouging, and fillet reinforcing should be linked to the heel and toe locations, not the top and bottom flanges, for a sloped connection. A preferred RBS configuration where the center of the RBS is perpendicular to the longitudinal axis of the beam, not parallel to the column as was used in the test specimens, was proposed.
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Acknowledgments
This testing project was sponsored by the Los Angeles World Airports (LAWA).
References
ABAQUS version 6.5 [Computer software]. Dassault Systèmes, Waltham, MA.
AISC. (2010a). “Prequalified connections for special and intermediate steel moment frames for seismic applications.” ANSI/AISC 358-10, Chicago.
AISC. (2010b). “Seismic provisions for structural steel buildings.” ANSI/AISC 341-10, Chicago.
Engelhardt, M. D., Winneberger, T., Zekany, A. J., and Potyraj, T. J. (1998). “Experimental investigations of Dogbone moment connections.” Eng. J., 35(4), 128–139.
FEMA (Federal Emergency Management Agency). (2000). “Recommended seismic design criteria for new steel moment-frame buildings.”, Washington, DC.
Jones, S. L., Fry, G. T., and Engelhardt, M. D. (2002). “Experimental evaluation of cyclically loaded reduced beam section moment connections.” J. Struct. Eng., 441–451.
Kaufmann, E. J., Metrovich, B., and Pense, A. W. (2001). “Characterization of cyclic inelastic strain behavior on properties of A572 Gr.50 and A913 Gr.50 rolled sections.”, National Center for Engineering Research on Advanced Technology for Large Structural Systems, Lehigh Univ., Bethlehem, PA.
Ricles, J. M., Mao, C., Lu, L., and Fisher, J. W. (2003). “Ductile details for welded unreinforced moment connections subject to inelastic cyclic loading.” Eng. Struct., 25(5), 667–680.
Uang, C. M., and Fan, C. C. (2001). “Cyclic stability criteria for steel moment connections with reduced beam section.” J. Struct. Eng., 1021–1027.
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© 2016 American Society of Civil Engineers.
History
Received: Mar 9, 2015
Accepted: Oct 20, 2015
Published online: Jan 14, 2016
Published in print: Jun 1, 2016
Discussion open until: Jun 14, 2016
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