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TimberFrameDesign
TheArtofEngineeringanExposedStructure
Disclaimer:ThispresentationwasdevelopedbyathirdpartyandisnotfundedbyWoodWorks ortheSoftwoodLumberBoard.
JimDeStefano,P.E.AIA.F.SEI
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“TheWoodProductsCouncil” isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.
Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACES forAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.
ThiscourseisregisteredwithAIACESforcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealinginanymaterialorproduct.
______________________________Questionsrelatedtospecificmaterials,methods,andserviceswillbeaddressedattheconclusionofthispresentation.
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Timberengineeringisjustasmuchanartasscience,onethatisrarelytaughtincollegeorpartofayoungengineer’sprofessionaleducation.Withthispresentation,attendeeshaveanopportunitytolearnfromatimberspecialistinvolvedinawardwinningtimber-frameprojectsthroughoutthenortheast.Topicswillincludethedesignofheavytimbertrusses,glulamelements,joineryandconnections,aswellasexteriorwallsystemsanddesigningforfireprotection.
CourseDescription
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LearningObjectives
• Apply the principles of timber truss design.
• Recognize options for timber-frame exterior wall systems.
• Consider basic joinery and connection methods and when to use them.
• Determine how to design timber frames for fire resistance.
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Structural EngineeringThe art of molding materials we do not wholly understand into shapes we cannot precisely analyze so as to withstand forces we cannot really assess in such a way that the community at large has no reason to suspect the extent of our ignorance
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NewCanaanLibrarycirca1977
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SaintJosephChurchcirca1987
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SaintPatrickChurchcirca2007
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HammerBeamTrussJoinery
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HoweTruss
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FinkTruss
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ScissorTruss
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HammerBeamTruss
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HammerBeamTrussWestminsterHall
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CruckFrame
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TheLodgeatCrookedLakeSiren,WI
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TheDepotKent,CT
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3 Simple Rules for engineering of timber joints
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Rule #1
The geometry of the joint should have mating surfaces that allow all structural loads to be transferred in bearing of one member against the other.
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TrussHeelJoint
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TrussKingPostJoint
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Rule #2
The wood removed to create the joint should not unduly weaken the member.
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GlulamLayup
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Rule #3
Allow for dimension changes due to seasoning of timber. The geometry of the joint should not be altered by shrinkage of the wood and bearing surfaces should remain in tight contact.
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TimberRivets
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NDS
• TimberSizing• BoltedConnections• TimberRivets
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www.timberframeengineeringcouncil.org
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Double Shear in Peg
778.0926.01365 BASEPEGV GGF =
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MysticSeaportWelcomeCenter
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StructuralInsulatedPanels(SIPs)
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DesignGuideforSIPsww.sips.org
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Structural Behavior
• Deflections often control• Shear deflection is significant• Shear often controls strength• Creep deflection is significant
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FireResistanceofMassTimber
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AWC-TechnicalReport10
www.awc.org
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EffectiveCharLayerThickness
1hour 1.8”1½hour 2.5”2hour 3.2”
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MassTimberFirePerformance
• Collapseproceededbyloudcrackingandhissingnoise
• Collapseproceededbylargedeflections
• Steelplateandboltconnectionsfailsuddenly
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ProtectSteelHardware
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DesignforDurability
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KeepYourFeetDry
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3DBIM
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ThisconcludesTheAmericanInstituteofArchitectsContinuingEducationSystemsCourse
QUESTIONS?
JimDeStefano,P.E.,AIA,[email protected]