Experimental Evaluation of Earthquake Resistant Posttensioned Steel Connections
Publication: Journal of Structural Engineering
Volume 128, Issue 7
Abstract
Nine large-scale subassembly tests were conducted to investigate the behavior of an innovative posttensioned wide flange beam-to-column connection for steel moment resisting frames subjected to seismic loading conditions. The connection includes top and seat angles bolted to the beam and column. Strands are placed along the length of the beam, passing through the column and posttensioned to provide a precompression of the beam against the column. The parameters investigated in the study include the angle thickness, angle gage length, beam flange reinforcing plates, connection shim plates, and posttensioning force. The test results demonstrate that posttensioned connections provide excellent elastic stiffness, strength, and ductility under cyclic loading, with energy dissipation occurring primarily in the angles. The connection initial elastic stiffness is comparable to that of a fully restrained welded connection. In addition, the connection has essentially no residual deformation following several cycles of inelastic story drift. Simple design models are developed and verified by the test results for estimating the connection decompression moment and moment capacity, as well as the increase in posttensioning strand force due to connection deformation.
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References
American Institute of Steel Construction. (1993). Load and resistant factored design, 2nd Ed., Manual of Steel Construction, Chicago.
American Society for Testing and Materials. (1997a). “Standard methods for tension testing of metallic materials.” ASTM Designation No. E8-19, Philadelphia.
American Society for Testing and Materials. (1997b). “Standard specification for steel strand, uncoated seven-wired for prestressed concrete.” ASTM Designation No. A416-94, Philadelphia.
Chen, S. J., Yeh, C. H., and Chu, J. M.(1996). “Ductile steel beam-to-column connections for seismic resistance.” J. Struct. Eng., 122(11), 1292–1299.
Cheok, G., and Lew, H.(1993). “Model precast concrete beam-to-column connections subject to cyclic loading.” PCI J. 38(4), 80–92.
Cheok, G., and Stone, W. (1994). “Performance of scale model precast concrete beam–column connections subjected to cyclic inelastic loads—Report No. 4,” Rep. No. NISTIR 5436, National Institute of Standards and Technology, NIST, Gaithersburg, Md.
El-Sheikh, M., Sause, R., Pessiki, S., Lu, L. W., and Kurama, Y. (1997). “Seismic analysis, behavior, and design of unbonded post-tensioned precast concrete frames.” Rep. No. EQ-97-02, Dept. of Civil and Environmental Engineering, Lehigh Univ., Bethlehem, Pa.
Engelhardt, M. D., and Sabol, T. A.(1998). “Reinforcing of steel moment connections with cover plates: Benefits and limitations.” Eng. Struct., 20(4-6), 510–520.
Galambos, T. V. (1998). Guide to stability design criteria for metal structures, 5th Ed., Structural Stability Research Council, SSRC, Lehigh Univ., Bethlehem, Pa.
Kasai, K. K., Hodgson, I., and Bleiman, D.(1998). “Rigid-bolted repair method for damaged moment connections.” Eng. Struct., 20(4-6), 521–532.
Peng, S. W. (2001). “Seismic resistant moment connections for concrete filled tube column-to-WF beam moment resisting frames.” PhD dissertation, Dept. of Civil Engineering, Lehigh Univ., Bethlehem, Pa.
Priestley, M., and MacRae, G.(1994). “Seismic tests of precast beam-to-column joint subassemblages with unbonded tendons,” PCI J., 41(1), 64–81.
Ricles, J. M., Sause, R., Garlock, M. M., and Zhao, C.(2001). “Post-tensioned seismic-resistant connections for steel frames.” J. Struct. Eng., 127(2), 113–121.
SAC Joint Venture (SAC) (1997). “Protocol for fabrication, inspection, testing, and documentation of beam–column connection tests and other experimental specimens.” Rep. No. SAC/BD-97/02, SAC Joint Venture, Sacramento, Calif.
Shen, J., and Astaneh-Asl, A.(1999). “Hysteretic behavior of bolted angle.” J. Constr. Steel Res., 51, 201–218.
Youssef, N. F. G., 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, Gaithersburg, Md.
Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 128 • Issue 7 • July 2002
Pages: 850 - 859
Copyright
Copyright © 2002 American Society of Civil Engineers.
History
Received: May 29, 2001
Accepted: Sep 30, 2001
Published online: Jun 14, 2002
Published in print: Jul 2002
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