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dc.contributor.authorGutknecht, Manoahen
dc.date.accessioned2017-03-15T20:31:24Z
dc.date.available2017-03-15T20:31:24Z
dc.identifier.urihttp://hdl.handle.net/1974/15438
dc.description.abstractThis thesis investigates the withdrawal capacity of self-tapping screws (STS) inserted parallel-to-grain. An experimental study was conducted with 100 screws tested in total. The experimental program includes two main test series. First, withdrawal testing was conducted on screws with a diameter of 10 mm with varying embedment depths, timber density and moisture content. Strains in the screws were monitored to detect if yielding was occurring. The withdrawal resistance increase as the embedment depth increased until the screws began yielding and eventually reaching their ultimate tension capacity. The ultimate tensile capacity was consistently reached at an embedment depth of 240 mm in dry Douglas Fir, 280 mm in wet Douglas Fir and 320 mm in dry Eastern White Pine. Second, withdrawal tests were conducted on screws with a diameter of 12mm and a constant embedment depth of 280 mm with varying timber density and moisture content. Increases in moisture decreased the withdrawal resistance. The average withdrawal resistance of screws in Douglas Fir showed to more susceptible to changes in moisture content when compared to Eastern White Pine. For both screw diameters, control specimens were tested to determine the tensile capacity of the screws on their own. The data from all the withdrawal tests was compared to three withdrawal equations: the CSA O86 equation for lag screws, the CCMC 13677-R Report equation for STSs, and the ETA-11/0196 equation for STS. In its un-factored form, the CSA O86 equation for lag screws was the best at predicting withdrawal resistance of the STSs inserted parallel-to-grain.en
dc.language.isoengen
dc.relation.ispartofseriesCanadian thesesen
dc.rightsQueen's University's Thesis/Dissertation Non-Exclusive License for Deposit to QSpace and Library and Archives Canadaen
dc.rightsProQuest PhD and Master's Theses International Dissemination Agreementen
dc.rightsIntellectual Property Guidelines at Queen's Universityen
dc.rightsCopying and Preserving Your Thesisen
dc.rightsThis publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.en
dc.subjectSelf-Tapping Screwsen
dc.subjectParallel-to-Grainen
dc.subjectWithdrawalen
dc.subjectWithdrawal Resistanceen
dc.titleParallel-to-Grain Withdrawal Resistance of Structural Self-Tapping Screws in Canadian Timberen
dc.typethesisen
dc.description.degreeM.A.Sc.en
dc.contributor.supervisorMacDougall, Colinen
dc.contributor.departmentCivil Engineeringen
dc.degree.grantorQueen's University at Kingstonen


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