Standoff screws functioning as mechanical shear connectors in composite joists

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dc.contributor.authorHankins, Steven C.en
dc.contributor.committeechairEasterling, William Samuelen
dc.contributor.committeememberBarker, Richard M.en
dc.contributor.committeememberMurray, Thomas M.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2014-03-14T21:27:43Zen
dc.date.adate2009-01-24en
dc.date.available2014-03-14T21:27:43Zen
dc.date.issued1994-08-15en
dc.date.rdate2009-01-24en
dc.date.sdate2009-01-24en
dc.description.abstractThe results of sixty-five double-sided pushout tests utilizing the Elco grade 8, 5/16 in. diameter, standoff screw functioning as a mechanical shear connector are presented. In all tests, the base material, through which the screw was fastened, was fabricated out of back to back angle to simulate the top chord of an open web steel joist. Varied test parameters include: steel deck profile, base angle thickness, screw embedment depth, slab thickness, and slab width. The objectives of the testing were (1) to provide an understanding of the strength of the standoff screw in various test geometries and (2) to provide an understanding of the slip characteristics, or ductility, of the connector. A review of literature presents several applicable existing welded stud strength models based on post-test observations of failure mechanisms. Modeled failure mechanisms include: concrete splitting, concrete pullout, rib shear, and stud shear. After applying the existing models to the pushout test data, the following conclusions are drawn: (1) the concrete splitting model developed by Oehlers (1989) can be used to predict the strength of the standoff screw in flat slab geometries and (2) no existing model adequately predicts the strength of the standoff screw in geometries utilizing profiled steel deck. An equation, based on a rederivation of a wedged shaped shear-cone pullout model (Lloyd & Wright 1990), is presented which predicts the strength of the standoff screw in geometries with steel deck with acceptable accuracy.en
dc.description.degreeMaster of Scienceen
dc.format.extentxii, 325 leavesen
dc.format.mediumBTDen
dc.format.mimetypeapplication/pdfen
dc.identifier.otheretd-01242009-063249en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-01242009-063249/en
dc.identifier.urihttp://hdl.handle.net/10919/40748en
dc.language.isoenen
dc.publisherVirginia Techen
dc.relation.haspartLD5655.V855_1994.H366.pdfen
dc.relation.isformatofOCLC# 31459276en
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subject.lccLD5655.V855 1994.H366en
dc.subject.lcshComposite constructionen
dc.subject.lcshScrewsen
dc.subject.lcshSteel joistsen
dc.titleStandoff screws functioning as mechanical shear connectors in composite joistsen
dc.typeThesisen
dc.type.dcmitypeTexten
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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