Apre-schemedesignguide 2ndedition
Structuraltimber elements
Apre-schemedesignguide
Structuraltimberelements
Apre-schemedesignguide
questions.Whatshouldthebuildingbemadefrom?Whereshouldcolumns orwallsbelocated?Isitaframedbuildingordoesithaveloadbearing fordetaildevelopment.
Structuraltimberelements:apre-schemedesignguidehasbeendevelopedfor useasanat-a-glancecomparativereferenceforstructuraltimberoptionsto assistwiththepre-schemedesignprocess.
Structuralengineerswhomayhavedesignedbuildingsoutofsteeland
structuraluseoftimberintheUK.JamesNormanofBristolUniversitywas timberexperts.
Anoteonthesecondedition
Anewchapteronrobustnesshasbeenaddedtothesecondeditionofthis
stabilityoptions,anddisproportionatecollapse.Additionaldetailhasbeen addedonmoisturemovement,typicalmomentconnectioncapacities,and
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JamesNorman
7 Contents 1Pre-schemedesign9 2Howtousethisbook11 2.4Governingdesigncriteria 14 2.6Acousticperformance 17 2.7Moistureandmovement 19 3Robustness 21 4Productselection37 4.4Roofoptions 48 4.5Walloptions 50 4.6Beamoptions 52 4.8Typesoftimberconnections 55 5Initialsizing 61 5.2Roofs 84 5.4Beams 128 5.6Momentconnectioncapacity 157 5.7Estimatingmoisturemovement 166
8 6Nextstage 171 6.1Sawntimberandglulam 171 6.2I-joists 172 6.7Robustnessanddisproportionatecollapse 175 6.8Moisturemovement 175 References 181
1Pre-schemedesign
Whereshouldcolumnsorwallsbelocated?Isitaframedbuildingordoesit ofthatprocessisthe‘scheme’thatthearchitectandstructuralengineerwill
Theprimaryreadershipisstructuralengineerswhomayhavedesigned buildingsofsteelandconcretebuthavenotacquiredsignificantexperience intimber.Itwillalsobeusefultoarchitects,buildingdesigners,lecturersand students.
ofthestructure;thereareotherresourcesthatprovidethisinformationas
1Pre-schemedesign 9
Figure1.1
Figure1.1:Whentousethisbook
2.2Howtousethedesigncharts
Figure2.2showshowproductsareselectedforvariousapplicationsin Chapter4andtheninitiallysizedinChapter5.
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Figure2.2:Visualcontents
pre-schemedesignspantablesprovidedcanbeused,butthiswilloverestimatedeflectionsandthereforejoistcentrescanbeincreasedasthedesign develops.
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portation.Insulationcanbeinstalledintopanelsduringfabrication,further speedingupconstructiononsite.
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andconnected.Avarietyofdifferentconnections areavailable,includingglue(effectivelyinthis asBrettstapelandavoidstheuseofgluesandmetal).
formofconstructionquitevariableatpresentintheUK.Thebondingofthe asingledirection.Thereforeanyholes(includingwindows)requireframing asthematerialisunabletospanintheminoraxis.
CLT
asglulam,exceptthatthetimberisbuiltupin layerswithdifferentlayershavingtimberslaidin perpendiculardirections.Theresultingpanelisa solidtimberpanelthathassignificantstrengthin bothdirections.Theratioofthesestrengthscanbe
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theearlystagesofdesign