Improving the Behavior of Special Concentrically Brace Frames with Cast Steel Inserts

Persistent Link:
http://hdl.handle.net/10150/265376
Title:
Improving the Behavior of Special Concentrically Brace Frames with Cast Steel Inserts
Author:
Ward, Kristen
Issue Date:
2012
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
A Cast Modular Ductile Bracing System (CMDB) has been developed as an alternative to special concentrically braced frames. The CMDB system introduces cast components at the ends and center of the brace in an attempt to produce a system with reliable strength, stiffness, and deformation capacity. A cruciform cross-section has been chosen for the cast component geometry, which is specially detailed to enhance energy dissipation and increase low cycle fatigue life thereby reducing the likelihood of fracture. In this dissertation, capacity design parameters are established that describe the axial strength and flexural strength of the cast components relative to the main hollow structural section member. These parameters are varied in 2D finite element models to understand the nature of the system and identify the best performing designs. The cruciform shape of the casting is varied to produce better performance and self-centering enhancements are introduced. 3D FE models of the CMDB system and a typical special concentrically braced frame, in combination with fracture indices, are used to compare the expected low cycle fatigue life of the two systems. The dynamic performance of the system is assessed through nonlinear finite element anaylses and conclusions are drawn. The performance of the system is proved experimentally.
Type:
text; Electronic Dissertation
Keywords:
Civil Engineering
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Civil Engineering
Degree Grantor:
University of Arizona
Advisor:
Fleischman, Robert B.

Full metadata record

DC FieldValue Language
dc.language.isoenen_US
dc.titleImproving the Behavior of Special Concentrically Brace Frames with Cast Steel Insertsen_US
dc.creatorWard, Kristenen_US
dc.contributor.authorWard, Kristenen_US
dc.date.issued2012-
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractA Cast Modular Ductile Bracing System (CMDB) has been developed as an alternative to special concentrically braced frames. The CMDB system introduces cast components at the ends and center of the brace in an attempt to produce a system with reliable strength, stiffness, and deformation capacity. A cruciform cross-section has been chosen for the cast component geometry, which is specially detailed to enhance energy dissipation and increase low cycle fatigue life thereby reducing the likelihood of fracture. In this dissertation, capacity design parameters are established that describe the axial strength and flexural strength of the cast components relative to the main hollow structural section member. These parameters are varied in 2D finite element models to understand the nature of the system and identify the best performing designs. The cruciform shape of the casting is varied to produce better performance and self-centering enhancements are introduced. 3D FE models of the CMDB system and a typical special concentrically braced frame, in combination with fracture indices, are used to compare the expected low cycle fatigue life of the two systems. The dynamic performance of the system is assessed through nonlinear finite element anaylses and conclusions are drawn. The performance of the system is proved experimentally.en_US
dc.typetexten_US
dc.typeElectronic Dissertationen_US
dc.subjectCivil Engineeringen_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineCivil Engineeringen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorFleischman, Robert B.en_US
dc.contributor.committeememberRichard, Ralph M.en_US
dc.contributor.committeememberKundu, Tribikramen_US
dc.contributor.committeememberHaldar, Achintyaen_US
dc.contributor.committeememberFleischman, Robert B.en_US
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