Steel and Composite Structures

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Investigation of major parameters affecting instablility of steel beams with RBS moment connections

  • Tabar, A.Moslehi (Department of Civil Engineering, Amirkabir University of Technology) ;
  • Deylami, A. (Department of Civil Engineering, Amirkabir University of Technology)
  • Received : 2005.01.20
  • Accepted : 2006.01.04
  • Published : 2006.06.25
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Abstract

One of the most promising ways through which a steel moment frame may attain high energy dissipating capability is to trim off a portion of the beam flanges near the column face. This type of moment connection, known as Reduced Beam Section (RBS) connection, has notable superiority in comparison with other moment connection types. As the result of the advantages of RBS moment connection, it has widely being used in practice. In spite of the good hysteretic behaviour, an RBS beam suffers from an undesirable drawback, which is local and lateral instability of the beam. The instability in the RBS beam reduces beam load-carrying capacity. This paper aims to investigate key issues influencing cyclic behaviour of RBS beams. To this end, a numerical analysis was conducted on a series of steel subassemblies with various geometric properties. The obtained results together with the existing experimental data are used to study the instability of RBS beams. A new slenderness concept is presented to control an RBS beam for combined local and lateral instability. This concept is in good agreement with the numerical and experimental results. Finally, a model is developed for the prediction of the magnitude of moment degradation owing to the instability of an RBS beam.

Keywords

References

  1. American Institute of Steel Construction (AISC) (2002), Seismic provisions for structural steel buildings, Chicago
  2. ANSYS (Revision 5.4) (1992), User s Manual, Theory, Swanson Analysis Systems, Inc, Vol. IV
  3. Calado, L. (2000) 'Cyclic behaviour of beam to column bare steel connection: Influence of column size', Moment Resistant Connections of Steel Frames in Siesmic Areas (ed. Mazzolani, F. M.), E & FN SPON, 267-290
  4. Chi, B. and Dang, C. M. (2002), 'Cyclic response and design recommendations of RBS moment connections with deep columns', J. Struct. Engrg., ASCE, 128(4),464-473 https://doi.org/10.1061/(ASCE)0733-9445(2002)128:4(464)
  5. Clark, P., Frank, K., Krawinkler, H. and Shaw, R. (1997), 'Protocol for fabrication, inspection, testing, and documentation of beam-column connection tests and other experimental specimens', Report No. SAC/BD-97/ 02, SAC Joint Venture, Sacramento, CA
  6. Deylami, A. and Moslehi Tabar, A. (2004), 'Effect of column panel zone characteristics on instability of beams with RBS moment resisting connections', Proc. 13th world Corf Earthquake Engrg., Vancouver, B.C., Canada, Paper No. 31
  7. El-Tawil, S., Vidarsson, E., Mikesell, T and Kunnath, S. (1999), 'Inelastic behavior and design of steel panel zones', J. Struct. Engrg., ASCE, 125(2), 183-193 https://doi.org/10.1061/(ASCE)0733-9445(1999)125:2(183)
  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 https://doi.org/10.1061/(ASCE)0733-9445(1993)119:12(3537)
  9. Engelhardt, M. D., Winneberger, T, Zekany, A. J. and Potyraj, T J. (1996), 'The dogbone connection: Part II' Modern Steel Construction, 46-55
  10. Engelhardt, M. D., Winneberger, T, Zekany, A. J. and Potyraj, T J. (1998), 'Experimental investigation of dogbone moment connections', Engrg. J., AISC, (Fourth Quarter), 128-138
  11. Jones, S. L., Fry, G T and Engelhardt, M. D. (2002), 'Experimental evaluation of cyclically loaded reduced beam section moment connections', J. Struct. Engrg., ASCE, 128(4),441-451 https://doi.org/10.1061/(ASCE)0733-9445(2002)128:4(441)
  12. Kemp, A. R. (1996), 'Inelastic lateral and local buckling in design coeds', J. Struct. Engrg., ASCE, 122(4), 374-382 https://doi.org/10.1061/(ASCE)0733-9445(1996)122:4(374)
  13. Krawinkler, A. (1978), 'Shear in beam-column joints in seismic design of steel frames', Engrg. J, AlSC, 3, 82-91
  14. Mahin, S. A. (1998), 'Lessons from damage to steel buildings during the Northridge earthquake' Engrg. Struct., 20(4-6), 261-270 https://doi.org/10.1016/S0141-0296(97)00032-1
  15. Miller, D. K. (1998), 'Lessons learned from the Northridge earthquake' Engrg. Struct., 20(4-6), 249-260 https://doi.org/10.1016/S0141-0296(97)00031-X
  16. Nethercot, D. A. and Trahair, N. S. (1976), 'Inelastic lateral buckling of determinate beams', J. Struct. Div., ASCE, 102(ST4),April, 701-717
  17. Plumier, A. (1997), 'The dogbone: Back to the future', Engrg. J., AISC, (Second Quarter), 61-67
  18. Popov, E. P. (1987), 'Panel zone flexibility in siesmic moment Joints', Joint Flexibility in Steel Frames (ed. W. F. Chen), Elsevier Applied Science, 91-118
  19. Popov, E. P., Yang, T. S. and Chang, S. P. (1998), 'Design of steel MRF connections before and after 1994 Northridge earthquake', Engrg. Struct., 20(12), 1030-1038 https://doi.org/10.1016/S0141-0296(97)00200-9
  20. SAC (1995), 'Interim Guidelines - Evaluation, repair, modification and design of welded steel moment frame structure', Report No. SAC-95-02, SAC Joint Venture
  21. Trahair, N. S. and Bradford, M. A. (1988), The Behaviour and Design of Steel Structures, 2nd ed., Chapman & Hall, London, UK
  22. Tsai, K. C. and Chen, W. Z. (2000), 'Seismic response of steel reduced beam section to weak panel zone moment joints', Behaviour of Steel Structures in Seismic Areas (eds. Mazzolani, F. M., and Tremblay, R.), Balkema, Rotterdam, 279-286
  23. Uang, C. M. and Fan, C. C. (1999), 'Cyclic instability of steel moment connections with reduced beam sections', Report No. SSRP 99-21, Department of Structural Engineering, University of California, San Diego, CA
  24. Uang, C. M. and Fan, C. C. (2001), 'Cyclic stability criteria for steel moment connections with reduced beam section', J. Struct. Engrg., ASCE, 127(9), 1021-1027 https://doi.org/10.1061/(ASCE)0733-9445(2001)127:9(1021)
  25. Yu, Q. S., Gilton, C. and Uang, C. M. (1999), 'Cyclic response of RBS moment connections: Loading sequence and lateral bracing effects', Report No. SSRP 99-13, Department of Structural Engineering, University of California, San Diego, CA
  26. Yu, Q. S. and Uang, C. M. (2001), 'Effects of near-fault loading and lateral bracing on the behaviour of RBS moment connections', Steel. Compos. Struct., 1(1),145-158 https://doi.org/10.1296/SCS2001.01.01.09

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