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Chord bearing capacity in long-span tubular trusses

  • Kozy, B. (Department of Civil & Environmental Engineering, University of Pittsburgh) ;
  • Boyle, R. (Department of Civil & Environmental Engineering, University of Pittsburgh) ;
  • Earls, C.J. (Department of Civil & Environmental Engineering, University of Pittsburgh)
  • Received : 2004.11.02
  • Accepted : 2005.09.15
  • Published : 2006.04.25

Abstract

The capacity of tubular truss chords subjected to concentrated reaction forces in the vicinity of the open end (i.e., the bearing region) is not directly treated by existing design specifications; although capacity equations are promulgated for related tubular joint configurations. The lack of direct treatment of bearing capacity in existing design specifications seems to represent an unsatisfactory situation given the fact that connections very often control the design of long-span tubular structures comprised of members with slender cross-sections. The case of the simple-span overhead highway sign truss is studied, in which the bearing reaction is applied near the chord end. The present research is aimed at assessing the validity of adapting existing specifications' capacity equations from related cases so as to be applicable in determining design capacity in tubular truss bearing regions. These modified capacity equations are subsequently used in comparisons with full-scale experimental results obtained from testing carried out at the University of Pittsburgh.

Keywords

References

  1. ABAQUS (2003), ABAQUS Theory Manual, Hibbitt, Karlsson & Sorensen, Inc., Pawtucket, Rhode Island, USA
  2. AASHTO (2001), Standard Specifications for Structural Supports for Highway Signs, Luminaires and Traffic Signals, 4th Edition, American Association of State Highway and Transportation Officials, Inc., Washington D.C
  3. AISC (2000), 'Load and resistance factor design specification for steel hollow structural sections', American Institute of Steel Construction, Chicago, Illinois, November 10
  4. AISC (2001), 'Manual of steel construction - load and resistance factor design 3rd edition', American Institute of Steel Construction, Chicago, Illinois, November
  5. AISC (1997a), 'Hollow structural sections connections manual', American Institute of Steel Construction, Chicago, Illinois
  6. AISC (1997b), 'Specification for the design of steel hollow structural sections', American Institute of Steel Construction, Chicago, Illinois, April 15
  7. AWS (2004), D 1.1 Structural Welding Code - Steel 19th Edition, American Welding Society, Miami, Florida, October 15
  8. Boyle, R. and Earls, C. J., (2004), 'Full-scale testing of tri-chord sign structure connections', Report No. CE/ST 28, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania
  9. Boyle, R. (2004), 'Experimental testing of hollow circular section bearing capacity', M.S. Thesis, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania. http://etd.library.pitt.edu/ETD/available/etd-07152004-103115/
  10. Li, Y. and Earls, C. J. (2002), 'Design recommendations for the proportioning and detailing of long-span trichord sign structures, Phase I', Report No. CE/ST 24, Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania
  11. Packer, J. A. and Henderson, J. E. (1997), 'Hollow structural section connections and trusses', second edition, Design Guide, Canadian Institute of Steel Construction, Willowdale, Ontario, Canada, June
  12. PENNDOT (2003a), 'Overhead sign structures - 2-Post & 4-Post Tri-chord truss spans from 18 288 to 73 152 (60' to 240') notes and design criteria', Standard Drawings for Bridge Design - BD 644-M, Commonwealth of Pennsylvania Department of Transportation, Harrisburg, Pennsylvania
  13. PENNDOT (2003b), 'Overhead sign structures - 2-Post & 4-Post tri-chord truss spans from 18288 to 73 152 (60' to 240') notes and design criteria', Standard Drawings for Bridge Construction - BC 744-M, Commonwealth of Pennsylvania Department of Transportation, Harrisburg, Pennsylvania
  14. Wardenier, J., Kurobane, Y., Packer, J. A., Dutta, D. and Yeomans, N. (1991), 'Design guide for circular hollow section (CHS) joints under predominantly static loading', CIDECT (ed.) and Verlag TUV Rheinland GmbH, Koln, Federal Republic of Germany

Cited by

  1. Bearing Capacity in Long-Span Tubular Truss Chords vol.133, pp.3, 2006, https://doi.org/10.1061/(asce)0733-9445(2007)133:3(356)
  2. Nonlinear stability of the upper chords in half-through truss bridges vol.36, pp.3, 2006, https://doi.org/10.12989/scs.2020.36.3.307