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Cross-Sectional Compactness and Bracing Requirements for Hybrid HPS Girders

Greco, Nicola (2002) Cross-Sectional Compactness and Bracing Requirements for Hybrid HPS Girders. Master's Thesis, University of Pittsburgh. (Unpublished)

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Current American steel building and bridge design specifications (AISC 1999, AASHTO 1998) simplify the flexural design of both homogeneous and hybrid I-shaped members by treating local and global inelastic stability phenomenon independently. According to both specifications, if a homogeneous or hybrid section is compact and sufficiently braced against lateral instability, the member will achieve or exceed its theoretical plastic moment capacity and maintain this capacity so as to allow sufficient rotation capacity for inelastic force redistribution to take place (Yura et al. 1978). Treating local and global buckling independently has been proven by past experience to be successful when formulating flexural design provisions for lower strength steels. However, new research (Earls 1999, 2000a, 2000b, 2001) is proving that this approach is much more difficult to apply to the design of High Performance Steel (HPS) I-shaped flexural members. The main objective of the current study is to investigate the effect HPS flanges have on hybrid girder flexural ductility. Finite element models of hybrid HPS girders, employing nonlinear shell elements, are used to study the influence of flange slenderness ratios, and bracing configuration on hybrid HPS girder response at ultimate.


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Item Type: University of Pittsburgh ETD
Status: Unpublished
CreatorsEmailPitt UsernameORCID
Greco, Nicolanigst2@pitt.eduNIGST2
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairEarls, Christopher J
Committee MemberLin, Jeen-Shang
Committee MemberOyler, John F
Date: 19 April 2002
Date Type: Completion
Defense Date: 16 April 2002
Approval Date: 19 April 2002
Submission Date: 17 April 2002
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: MSCE - Master of Science in Civil Engineering
Thesis Type: Master's Thesis
Refereed: Yes
Uncontrolled Keywords: Compactness; High Performance Steel; Hybrid Steel Girder; Local and Global Buckling; Nonlinear Finite Element Analysis; Rotation Capacity; Unbraced Length
Other ID:, etd-04172002-153353
Date Deposited: 10 Nov 2011 19:37
Last Modified: 15 Nov 2016 13:40


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