Seismic performance of steel frames with a post-Northridge connection

Persistent Link:
http://hdl.handle.net/10150/280104
Title:
Seismic performance of steel frames with a post-Northridge connection
Author:
Mehrabian, Ali
Issue Date:
2002
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:
Seismic performance of steel frames with "post-Northridge" bolted web, welded flange, beam-column connection with adequate ductility (BWWF-AD) and "pre-Northridge" bolted web, welded flange, beam-column connection (BWWF) is comprehensively evaluated using a nonlinear finite element method (FEM). The material and geometric nonlinearities, major sources of energy dissipation, and the flexibility of the connections are considered. The Richard Model is employed to analytically describe the moment-relative rotation (M-theta) curves of BWWF-AD connections using limited available data of full-scale, ATC-24 laboratory experiments. From the limited experimental data, an analytical method is developed to predict and to extrapolate the M-theta curves of BWWF-AD connection with any sizes of beams and columns. This method is used to extend the test results of an individual BWWF-AD connection to a frame with several or more BWWF-AD connections. The inelastic seismic response of two SAC Steel Project benchmark steel moment-resisting frames (SMRF) with BWWF and BWWF-AD connections modeled as partially restrained (PR) and as fully restrained (FR) are calculated and compared. Furthermore, the effects of BWWF and BWWF-AD connections on the frames' maximum top lateral and interstory displacement, maximum connection rotation, drift, and the frames' base shear forces are evaluated and compared. Moreover, the calculated drift and base shear forces of the frames are compared with the 2000 Edition of International Building Code (IBC 2000). This study suggests that the Richard Model captures the experimental M-theta curves of BWWF-AD connections accurately. BWWF-AD connections have significantly larger elastic stiffness than other types of PR connections. Their elastic stiffness is similar to that of bolted, double web angle with top and seat connection, but their ductility is much larger. In most cases, the presence of BWWF-AD connections improved the seismic performance of the steel frames. The proposed method analytically confirmed the beneficial effects of BWWF-AD connections observed in full-scale testing.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Engineering, Civil.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Civil Engineering and Engineering Mechanics
Degree Grantor:
University of Arizona
Advisor:
Haldar, Achintya

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleSeismic performance of steel frames with a post-Northridge connectionen_US
dc.creatorMehrabian, Alien_US
dc.contributor.authorMehrabian, Alien_US
dc.date.issued2002en_US
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.abstractSeismic performance of steel frames with "post-Northridge" bolted web, welded flange, beam-column connection with adequate ductility (BWWF-AD) and "pre-Northridge" bolted web, welded flange, beam-column connection (BWWF) is comprehensively evaluated using a nonlinear finite element method (FEM). The material and geometric nonlinearities, major sources of energy dissipation, and the flexibility of the connections are considered. The Richard Model is employed to analytically describe the moment-relative rotation (M-theta) curves of BWWF-AD connections using limited available data of full-scale, ATC-24 laboratory experiments. From the limited experimental data, an analytical method is developed to predict and to extrapolate the M-theta curves of BWWF-AD connection with any sizes of beams and columns. This method is used to extend the test results of an individual BWWF-AD connection to a frame with several or more BWWF-AD connections. The inelastic seismic response of two SAC Steel Project benchmark steel moment-resisting frames (SMRF) with BWWF and BWWF-AD connections modeled as partially restrained (PR) and as fully restrained (FR) are calculated and compared. Furthermore, the effects of BWWF and BWWF-AD connections on the frames' maximum top lateral and interstory displacement, maximum connection rotation, drift, and the frames' base shear forces are evaluated and compared. Moreover, the calculated drift and base shear forces of the frames are compared with the 2000 Edition of International Building Code (IBC 2000). This study suggests that the Richard Model captures the experimental M-theta curves of BWWF-AD connections accurately. BWWF-AD connections have significantly larger elastic stiffness than other types of PR connections. Their elastic stiffness is similar to that of bolted, double web angle with top and seat connection, but their ductility is much larger. In most cases, the presence of BWWF-AD connections improved the seismic performance of the steel frames. The proposed method analytically confirmed the beneficial effects of BWWF-AD connections observed in full-scale testing.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectEngineering, Civil.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineCivil Engineering and Engineering Mechanicsen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorHaldar, Achintyaen_US
dc.identifier.proquest3060978en_US
dc.identifier.bibrecord.b43041735en_US
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