Facile Retrofit of Shear Tab Connections for Enhanced Lateral Resistance of Steel Gravity Frames
Publication: Journal of Performance of Constructed Facilities
Volume 32, Issue 5
Abstract
A facile and effective method for retrofitting simple shear tab connections in a steel gravity frame is presented to improve its overall lateral force-resisting capacity. At a target shear tab connection, the existing gap between the beam flange and column face is snugly filled with a tapered steel plate, which is then field-attached to the column face. When a steel gravity frame is subjected to lateral loads (due to, for example, earthquake and strong wind), the retrofitted shear tab connection deforms and promptly engages the beam to bind the column via the filler plate, thereby exerting a horizontal thrust to the column at the retrofitted beam flange level. Hence, the moment arm between horizontal reactions increases and so does the flexural capacity of the connection. Numerical results from detailed finite-element analysis confirm the role of beam binding action enabled by the present method in satisfactorily enhancing both the strength and stiffness of shear tab connections as a gravity frame deforms laterally.
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Acknowledgments
The material is based on work supported in part by a start-up fund awarded by the CUA School of Engineering. However, the opinions expressed herein are those of the author and do not necessarily reflect those of the sponsor.
References
AISC. 2010. Specification for structural steel buildings. ANSI/AISC 360-10. Chicago: AISC.
ANSYS. 2015. ANSYS mechanical 16.2. Canonsburg, PA: ANSYS.
ASCE. 2010. Minimum design loads for buildings and other structures. ASCE 7-10. Reston, VA: ASCE.
Astaneh-Asl, A., J. Liu, and K. M. McMullin. 2002. “Behavior and design of single plate shear connections.” J. Constr. Steel Res. 58 (5–8): 1121–1141. https://doi.org/10.1016/S0143-974X(01)00101-8.
Astaneh-Asl, A., D. Modjtahedi, K. McMullin, J. H. Shen, and E. D’Amore. 1998. “Stability of damaged steel moment frames in Los Angeles.” Eng. Struct. 20 (4–6): 433–446. https://doi.org/10.1016/S0141-0296(97)00145-4.
Bhatia, V., and S. Ghosh. 2008. “Seismic upgradation of non-seismic steel buildings using steel plate shear walls.” In Proc., 14th World Conf. on Earthquake Engineering. Rotterdam, Netherlands: A.A. Balkema.
Ding, Y., Y. Chen, and Y. Shi. 2016. “Progressive collapse analysis of a steel frame subjected to confined explosion and post-explosion fire.” Adv. Struct. Eng. 19 (11): 1780–1796. https://doi.org/10.1177/1369433216649381.
Elkady, A., and D. G. Lignos. 2015. “Effect of gravity framing on the overstrength and collapse capacity of steel frame buildings with perimeter special moment frames.” Earthquake Eng. Struct. Dyn. 44 (8): 1289–1307. https://doi.org/10.1002/eqe.2519.
FEMA. 2006. Next-generation performance-based seismic design guidelines. FEMA 445. Washington, DC: FEMA.
Flores, F. X., J. A. Jarrett, and F. A. Charney. 2012. “The influence of gravity-only framing on the performance of steel moment frames.” In Proc., 15th World Conf. on Earthquake Engineering. Rotterdam, Netherlands: A.A. Balkema.
Hossain, K., and B. Gencturk. 2014. “Life-cycle environmental impact assessment of reinforced concrete buildings subjected to natural hazards.” J. Archit. Eng. 22 (4): A4014001. https://doi.org/10.1061/(ASCE)AE.1943-5568.0000153.
Judd, J., F. Charney, and S. Pryor. 2015. “Retrofit of steel-frame buildings using enhanced gravity-frame connections.” In Improving the seismic performance of existing buildings and other structures 2015, 132–143. Reston, VA: ASCE.
Kinali, K. 2008. Fragility assessment of non-seismically designed steel frames. Saarbrücken, Germany: VDM Verlag.
Leon, R., J. F. Hajjar, and C. K. Shield. 1997. “The effect of composite floor slabs on the behavior of steel moment-resisting frames in the Northridge earthquake.” In Proc., Engineering Foundation Conf. on Composite Construction in Steel and Concrete III, 738–751. New York: ASCE.
Liu, J., and A. Astaneh-Asl. 2000. “Cyclic testing of simple connections including effects of slab.” J. Struct. Eng. 126 (1): 32–39. https://doi.org/10.1061/(ASCE)0733-9445(2000)126:1(32).
Liu, M., and S. A. Burns. 2003. “Multiple fully stressed designs of steel frame structures with semi-rigid connections.” Int. J. Numer. Methods Eng. 58 (6): 821–838. https://doi.org/10.1002/nme.807.
Liu, M., S. A. Burns, and Y. K. Wen. 2005. “Multiobjective optimization for performance-based seismic design of steel moment frame structures.” Earthquake Eng. Struct. Dyn. 34 (3): 289–306. https://doi.org/10.1002/eqe.42610.1002/eqe.426.
Liu, M., and B. Mi. 2017. “Life cycle cost analysis of energy-efficient buildings subjected to earthquakes.” Energy Build. 154: 581–589. https://doi.org/10.1016/j.enbuild.2017.08.056.
Liu, M., Y. K. Wen, and S. A. Burns. 2004. “Life cycle cost oriented seismic design optimization of steel moment frame structures with risk-taking preference.” Eng. Struct. 26 (10): 1407–1421. https://doi.org/10.1016/j.engstruct.2004.05.015.
Main, J., and F. Sadek. 2013. “Modeling and analysis of single-plate shear connections under column loss.” J. Struct. Eng. 140 (3): 04013070. https://doi.org/10.1061/(ASCE)ST.1943-541X.0000866.
Song, J., and B. Ellingwood. 1999. “Seismic reliability of special moment steel frames with welded connections: I.” J. Struct. Eng. 125 (4): 357–371. https://doi.org/10.1061/(ASCE)0733-9445(1999)125:4(357).
Weigand, J., and J. Berman. 2015. “New steel gravity connection details for enhanced integrity.” In Structures Congress 2015, 1150–1160. Reston, VA: ASCE.
Wen, R., B. Akbas, and J. Shen. 2013. “Practical moment-rotation relations of steel shear tab connections.” J. Constr. Steel Res. 88: 296–308. https://doi.org/10.1016/j.jcsr.2013.05.018.
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Published In
Journal of Performance of Constructed Facilities
Volume 32 • Issue 5 • October 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jun 15, 2017
Accepted: May 3, 2018
Published online: Jul 25, 2018
Published in print: Oct 1, 2018
Discussion open until: Dec 25, 2018
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