应用钢结构设计外文翻译

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1、AppliedStructuralSteelDesign(4thEdition)byGeorgeF.SpiegelandGeorgeF.Limbrunner9-2OpenWebSteelJoists,K-SeriesThedesignoftheK-Seriesjoistchordisbasedonasteelminimumyieldstrengthof50,000psi.Thedesignofthewebmembersmaybebasedonasteelminimumyieldstrengthof36,000psior50,00

2、0psi.AnexampleofthestandarddesignationforK-Seriesjoistsis22K7.Thedepthofthisjoistis22in.Krepresentstheseries,andthenumber7denotestherelativesizeofthechordsofthejoist.Chordsizesaredesignatedbythenumbers3through12,thesizeincreasingwithincreasingnumber.Thechordandwebmem

3、bersmayvaryinshapeandmakeupfrommanufacturertomanufacturer,butthedesignandthecapacityofthejoistsmustconformtotheSJIspecificationsandtothestandardizedloadtables.TheK-Seriesstandardloadtableandtheeconomytable(whichisusedforselection)areapplicablewherethejoistsareinstall

4、eduptoamaximumslopeof2in.perfoot.TheuseofopenwebsteeljoistsinanygivenapplicationmustbebasedonSJIrequirementsasfurnishedinitsstandardspecifications.TheserequirementsfortheK-Seriesjoistsaresummarizedasfollows:Inconstructionthatusesjoists,bridgingandbridginganchorsarere

5、quiredfortheprimarypurposeoffurnishinglateralstabilityforthejoists,particularlyduringtheconstructionphase.Thebridgingspansbetweenandperpendiculartothesteeljoists.Itisrequiredthatoneendofalljoistsbeattachedtotheirsupportsbeforeallowingtheweightofanerectoronthejoists.W

6、henboltedconnectionsareused,theboltsmustbesnugtightened.Allbridgingmustbecompletelyinstalledandthejoistspermanentlyfastenedintoplacebeforetheapplicationofanyconstructionloads.Evenundertheweightofanerector,thejoistsmayexhibitsomedegreeoflateralinstabilityuntilthebridg

7、ingisinstalled.Thebridgingalsoservesthepurposeofholdingthesteeljoistsinpositionasshownontheplans.Theminimumnumberofrowsofbridgingisafunctionofthejoistchordsizeandspanlength.Atableisfurnishedinthestandardspecificationsthatestablishestherequirednumberofrowsofbridging.S

8、pacingofbridgingrowsshouldbeapproximatelyequal.TwopermissibletypesofbridgingmaybeobservedinFigure9-2.Horizontalbridging(Figure9-2a)