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Development and Evaluation of a New Beam Element for Modeling the Partially Yielded Regions of Steel W-Shapes

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Date Issued:
2022
Abstract/Description:
This research investigates the development and performance of a new closed-form stiffness matrix for a beam element that assumes a second-order stiffness variation over the regions of beam-columns with partial yielding. Stiffness reduction occurs due to yielding of the cross-section of W-Shapes under certain conditions of residual stress, moment, and axial load. Currently, inelastic material models assume a linear stiffness variation over the beam element length, even though it is well known they vary nonlinearly over the partially yielded regions. To evaluate the performance of the new stiffness matrix, two beams and four frames were analyzed using MASTAN2 considering five load increment and nine element conditions. Discussion and recommendations are provided regarding the parameters that influence the modeling results and the ability of the new stiffness matrix to consistently provide better results than the original stiffness matrix with an assumed linear stiffness variation.
Title: Development and Evaluation of a New Beam Element for Modeling the Partially Yielded Regions of Steel W-Shapes.
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Name(s): Silva, Naomi , author
Rosson, Barry T. , Thesis advisor
Florida Atlantic University, Degree grantor
Department of Civil, Environmental and Geomatics Engineering
College of Engineering and Computer Science
Type of Resource: text
Genre: Electronic Thesis Or Dissertation
Date Created: 2022
Date Issued: 2022
Publisher: Florida Atlantic University
Place of Publication: Boca Raton, Fla.
Physical Form: application/pdf
Extent: 73 p.
Language(s): English
Abstract/Description: This research investigates the development and performance of a new closed-form stiffness matrix for a beam element that assumes a second-order stiffness variation over the regions of beam-columns with partial yielding. Stiffness reduction occurs due to yielding of the cross-section of W-Shapes under certain conditions of residual stress, moment, and axial load. Currently, inelastic material models assume a linear stiffness variation over the beam element length, even though it is well known they vary nonlinearly over the partially yielded regions. To evaluate the performance of the new stiffness matrix, two beams and four frames were analyzed using MASTAN2 considering five load increment and nine element conditions. Discussion and recommendations are provided regarding the parameters that influence the modeling results and the ability of the new stiffness matrix to consistently provide better results than the original stiffness matrix with an assumed linear stiffness variation.
Identifier: FA00014065 (IID)
Degree granted: Thesis (MS)--Florida Atlantic University, 2022.
Collection: FAU Electronic Theses and Dissertations Collection
Note(s): Includes bibliography.
Subject(s): Steel
Civil engineering
Persistent Link to This Record: http://purl.flvc.org/fau/fd/FA00014065
Use and Reproduction: Copyright © is held by the author with permission granted to Florida Atlantic University to digitize, archive and distribute this item for non-profit research and educational purposes. Any reuse of this item in excess of fair use or other copyright exemptions requires permission of the copyright holder.
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Host Institution: FAU
Is Part of Series: Florida Atlantic University Digital Library Collections.