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Chord Bearing Capacity in Long-Span Tubular Trusses

Kozy, Brian (2005) Chord Bearing Capacity in Long-Span Tubular Trusses. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Existing design specifications used in North America and Europe do not directly treat the general limit state of local collapse of tubular truss chords at bearing supports; although these specifications do consider the very specific case related to chord wall resistance under concentrated loads applied through simple gusset plate or tubular branch connections. The lack of general and robust treatment of chord bearing strength represents an unsatisfactory situation given the fact that very large reaction forces are often applied locally to the ends of chord members with slender cross-sections in long-span overhead highway sign trusses. A number of these structures in the U.S. have been shown to be inadequate for this limit state; a situation precipitating costly retrofits, construction delays, and motorist safety concerns. This dissertation research is aimed at quantifying the bearing strength of circular chords in long, simple-span tubular trusses. Two (2) full-scale experimental tests were conducted at the University of Pittsburgh as part of the current research effort. In addition, a parametric study based on the finite element (FE) method is also carried out. The nonlinear FE modeling techniques are first validated against the experimental testing results and then employed in a parametric study whose results are reported on herein. The current study reveals that the bearing strength is influenced by the geometry of the bearing region including any adjacent intermediate truss member(s), the nature of loading, and the material properties. Using a semi-empirical approach, general capacity equations for predicting the ultimate bearing strength is developed. Capacity equations are developed for axial loading (P), moment (M), and interaction of both (P+M).


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairEarls, Chris
Committee MemberLin, Jeen-Shang
Committee MemberHarries, Kent
Committee MemberA.M., Morteza
Committee MemberSmolinski, Patrick
Date: 31 January 2005
Date Type: Completion
Defense Date: 3 December 2004
Approval Date: 31 January 2005
Submission Date: 29 November 2004
Access Restriction: No restriction; Release the ETD for access worldwide immediately.
Institution: University of Pittsburgh
Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: bearing capacity; hollow structural sections; HSS; tubular connections; tubular steel; tubular structures
Other ID:, etd-11292004-074454
Date Deposited: 10 Nov 2011 20:06
Last Modified: 15 Nov 2016 13:52


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