Pitt Logo LinkContact Us

Cross Sectional Compactness and Bracing Requirements for HPS70W Girders

Thomas, Steven Joseph (2002) Cross Sectional Compactness and Bracing Requirements for HPS70W Girders. Master's Thesis, University of Pittsburgh.

[img]
Preview
PDF - Primary Text
Download (2564Kb) | Preview

    Abstract

    The present study employs experimentally verified nonlinear finite elementmodeling techniques for the study of high performance steel (HPS) I-shaped bridgegirders. Evaluations as to the appropriateness of using the current AISC LRFD StructuralSteel Building Design Specificatio n (1999) and AASHTO LRFD Bridge DesignSpecification (1998) provisions for maintaining cross-sectional compactness, anappropriate lateral bracing placement, and a sufficient lateral bracing stiffness for thepurpose of plastic analysis and design are carried out within the context of applicationsinvolving A709 HPS483W high performance steel.It appears that the current AISC and AASHTO provisions are not applicable tobridge girders made from A709 HPS483W steel. That is, all criteria relating to flangeand web compactness, unbraced length, and bracing stiffness, when considering A709HPS483W steel, are unconservative. New lateral bracing requirements are proposed,altering both the position of the bracing as well as the required bracing stiffness. Inaddition, new flange and web compactness criteria are developed for use with A709HPS483W steel.


    Share

    Citation/Export:
    Social Networking:

    Details

    Item Type: University of Pittsburgh ETD
    Creators/Authors:
    CreatorsEmailORCID
    Thomas, Steven Josephsjt1@pitt.edu
    ETD Committee:
    ETD Committee TypeCommittee MemberEmailORCID
    Committee ChairEarls, Christopher J
    Committee MemberLin, Jeen-Shang
    Committee MemberOyler, John F
    Committee MemberTorkamani, Morteza A M
    Title: Cross Sectional Compactness and Bracing Requirements for HPS70W Girders
    Status: Unpublished
    Abstract: The present study employs experimentally verified nonlinear finite elementmodeling techniques for the study of high performance steel (HPS) I-shaped bridgegirders. Evaluations as to the appropriateness of using the current AISC LRFD StructuralSteel Building Design Specificatio n (1999) and AASHTO LRFD Bridge DesignSpecification (1998) provisions for maintaining cross-sectional compactness, anappropriate lateral bracing placement, and a sufficient lateral bracing stiffness for thepurpose of plastic analysis and design are carried out within the context of applicationsinvolving A709 HPS483W high performance steel.It appears that the current AISC and AASHTO provisions are not applicable tobridge girders made from A709 HPS483W steel. That is, all criteria relating to flangeand web compactness, unbraced length, and bracing stiffness, when considering A709HPS483W steel, are unconservative. New lateral bracing requirements are proposed,altering both the position of the bracing as well as the required bracing stiffness. Inaddition, new flange and web compactness criteria are developed for use with A709HPS483W steel.
    Date: 26 April 2002
    Date Type: Completion
    Defense Date: 18 April 2002
    Approval Date: 26 April 2002
    Submission Date: 22 April 2002
    Access Restriction: No restriction; The work is available for access worldwide immediately.
    Patent pending: No
    Institution: University of Pittsburgh
    Thesis Type: Master's Thesis
    Refereed: Yes
    Degree: MSCE - Master of Science in Civil Engineering
    URN: etd-04222002-145423
    Uncontrolled Keywords: Compactness; Ductility; High Performance Steel (HPS); HPS bridge girder design; Lateral bracing; Nonlinear finite element analysis; Plastic analysis and design; Rotation capacity
    Schools and Programs: Swanson School of Engineering > Civil and Environmental Engineering
    Date Deposited: 10 Nov 2011 14:40
    Last Modified: 29 May 2012 16:26
    Other ID: http://etd.library.pitt.edu:80/ETD/available/etd-04222002-145423/, etd-04222002-145423

    Actions (login required)

    View Item

    Document Downloads