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Multi-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands

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dc.contributor.authorRodriguez Lopez, Santiago, author
dc.contributor.authorMahmoud, Hussam, advisor
dc.contributor.authorAtadero, Rebecca, committee member
dc.contributor.authorRiveros, Guillermo, committee member
dc.contributor.authorSenior, Bolivar, committee member
dc.date.accessioned2018-09-10T20:04:07Z
dc.date.available2018-09-10T20:04:07Z
dc.date.issued2018
dc.description.abstractHigh-Strength bolts are used extensively in structures and are regarded as the better option for connections subjected to fatigue as compared to welds and rivets. Studies have shown the superior resistance to fatigue and conclude that it should not be an issue when a bolt is properly pre-tensioned. Nevertheless, a recent application of properly pre-tensioned bolts subjected to shear stress reversals shows extensive fatigue cracking and total severing of up to 50% of the bolts in the connections. Sufficient evidence, based on experimental testing and field observations, exist to suggest the possibility of fully pre-tensioned bolts coming loose due to shear stress reversals. The problem of transverse vibrational loosening of bolts has been extensively researched as well as the issue of bolt fatigue. Only recently have they been considered together although no studies of this interaction have been done on high-strength bolts. Certain mechanisms mark the onset of bolt loosening and fatigue when bolts are subjected to cyclic shear or shear combined with tension. In this study, causes of bolt loosening and fatigue failure of bolted connections are explored. Especially the study pertains to structural bolts that are subjected to cyclic loads in multiple directions with shear reversals, which are typical of mitre gate to pintle socket connections. Certain mechanisms mark the onset of bolt loosening and fatigue when bolts are subjected to cyclic shear or shear combined with tension. The actual mechanisms and limits at which this occurs are explored in the literature and experimentally and recommendations are provided.
dc.format.mediumborn digital
dc.format.mediummasters theses
dc.identifierRodriguezLopez_colostate_0053N_14831.pdf
dc.identifier.urihttps://hdl.handle.net/10217/191254
dc.languageEnglish
dc.language.isoeng
dc.publisherColorado State University. Libraries
dc.relation.ispartof2000-2019
dc.rightsCopyright and other restrictions may apply. User is responsible for compliance with all applicable laws. For information about copyright law, please see https://libguides.colostate.edu/copyright.
dc.subjecthigh strength bolts
dc.subjectmultiaxial fatigue
dc.subjectslip-critical
dc.subjectmitre gate
dc.subjectconnection reliability
dc.subjectpintle bolts
dc.titleMulti-axial fatigue strength of structural bolts in slip-critical connections under combined cyclic axial and shear demands
dc.typeText
dcterms.rights.dplaThis Item is protected by copyright and/or related rights (https://rightsstatements.org/vocab/InC/1.0/). You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
thesis.degree.disciplineCivil and Environmental Engineering
thesis.degree.grantorColorado State University
thesis.degree.levelMasters
thesis.degree.nameMaster of Science (M.S.)

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