TIMBER-CONCRETE COMPOSITE FLOOR SYSTEMS · 2018-12-17 · TIMBER-CONCRETE COMPOSITE FLOOR SYSTEMS...

13SEPTEMBER2017

TIMBER-CONCRETECOMPOSITEFLOORSYSTEMS

Disclaimer:ThispresentationwasdevelopedbyathirdpartyandisnotfundedbyWoodWorksortheSoftwoodLumberBoard.

“TheWoodProductsCouncil”isaRegisteredProviderwithTheAmericanInstituteofArchitectsContinuingEducationSystems(AIA/CES),Provider#G516.

Credit(s)earnedoncompletionofthiscoursewillbereportedtoAIACES forAIAmembers.CertificatesofCompletionforbothAIAmembersandnon-AIAmembersareavailableuponrequest.

ThiscourseisregisteredwithAIACESforcontinuingprofessionaleducation.Assuch,itdoesnotincludecontentthatmaybedeemedorconstruedtobeanapprovalorendorsementbytheAIAofanymaterialofconstructionoranymethodormannerofhandling,using,distributing,ordealing inanymaterialorproduct.

______________________________

Questions relatedtospecificmaterials,methods,andserviceswillbeaddressed attheconclusionofthispresentation.

TIMBER-CONCRETE COMPOSITE FLOOR SYSTEMSSKIDMORE, OWINGS & MERRILL LLP

WOODWORKS WEBINAR13 SEPTEMBER 2017

Manycommercial,mixed-useandmulti-familybuildingsutilizelong-spanfloorsystemsthatallowforopenandflexibleinteriorfloorplans.Competitivelong-spanfloorsystemsmadewithmasstimber-concretecompositepanelsareanopportunity toexpandtheuseofwoodframinginavarietyofoccupancyandbuildingtypes, includinghigh-rises.

Skidmore,Owings&Merrillhasbeenresearchingtimber-concretecompositefloorsystemsthatcansatisfythestructural,serviceability,acousticandfirerequirementsofhigh-risebuildingsandhasrecentlycompletedaphysicaltestingprogramwithOregonStateUniversity.

Thispresentationwillshowcasetheresults,includingtheeffectofshearconnectortypeoncompositeaction,two-wayspanningbehaviorofcompositetimberpanels,long-termbehaviors,andfull-scaleverificationofatypicallong-spanbay.

CourseDescription



1. Describetimber-concretecompositefloorsystemsandtheiruseinmodernmasstimberbuildings.

2. Reviewthestructuraldesignprinciplesandprocessesassociatedwithtimber-concretecompositefloorsystems.

3. Demonstratehowtimber-concretecompositefloorsystemscansatisfythestructural,serviceability,acousticandfirerequirementsofmid-riseandhigh-risebuildings.

4. Highlightresultsfromrecenttimber-concretecompositetesting,includingshearconnectortypes,two-wayspanningbehaviorandfullscaleverification.

LearningObjectives



CompositeStructures

STEEL CONCRETE

TIMBER



CompositeElements



CompositeBuildings



WhyComposite?

Strength Stiffness Mass Acoustics Fire



CompositeStructures

STEEL CONCRETE

TIMBER



Composite-Timber Systems

MadisonHouseTPP/SOM

WoodWorks Case Study of Bullitt CenterHSK / HBV PlatesSFS VB Screws



SOMTimberResearch



Composite-Timber Advantage



Cross-Laminated Timber(CLT)MadisonHouse

TPP/SOMMaterialAdvantages

•Prefabricated-Reducedon-sitelabor-Speedofconstruction-Non-structuralsystems

•Lightweight-ReducedSeismicLoads-Foundationsavings

•Thermalinsulator-FireResistant-Energysavings

•Marketingadvantages-Aesthetics-SustainabilityStructurlam Crosslam



SpanLimits (Strength &Stiffness) – Structurlam Crosslam



Acoustics– FloorAssemblies – USCLTHandbook



FireResistance – FailureModes– USCLTHandbook



FireResistance – Integrity Failures – USCLTHandbook



CombinedAcoustic/Fire/Structural Solution

Reinforced concrete toppingslabforseismicdiaphragm,increasedspans,acoustic, andfireresistance.



WhyComposite-Timber?

Strength Stiffness Mass Acoustics Fire



CompositeConcreteToppingSlabs

AcousticsFireResistanceSpan LengthSeismic DiaphragmDurability

SOMTestSpecimensatOregonStateUniversity



CreatingHigh-Quality Space



DesignMethodology forCompositeCLTFloors

1. CalculatesectionalpropertiesofCLT(EIeff,EAeff)perUSCLTHandbook,NDS,other

2. Selectcompositefastenertype,determineslipstiffness(Ks)perManufacturer

3. CalculateeffectivecompositestiffnessperAnnexBofEurocode5(EN,2004)

4. Calculateapparentstiffnessormodelrollingshearstiffnesslosses

5. Calculateserviceabilityandultimatelimitstatesandevaluate,redesign

Note:FloorSystemsMostLikelyGovernedbyStiffness



1.CLTProperties – USCLTHandbook



2.CompositeConnectorProperties - Manufacturer



3.CompositeProperties - Eurocode5,AnnexB



4.ApparentStiffnessorModel– USCLTHandbook



5.CalculateLimitStates&EvaluateDesign

1. Stiffness– Deflection&Vibrations

2. CompositeConnectorCapacity

3. Maximumwood,concrete,andrebarstresses



DesignMethodology forCompositeCLTFloors - Recap

1. CalculatesectionalpropertiesofCLT(EIeff,EAeff)perUSCLTHandbook,NDS,other

2. Selectcompositefastenertype,determineslipstiffness(Ks)perManufacturer

3. CalculateeffectivecompositestiffnessperAnnexBofEurocode5(EN,2004)

4. Calculateapparentstiffnessormodelrollingshearstiffnesslosses

5. Calculateserviceabilityandultimatelimitstatesandevaluate,redesign



Testing atOregonStateUniversity



• ConnectorTypes• 7testsofshearconnectors• 2bareCLTcontroltests

• Bi-DirectionalStiffness• 3testsoftwo-way&positive-negativebending

• LongTermCreep• 2testsofpositiveandnegativecreep(4monthlongeach)

• FullScaleTest,8ftWidex36ftLong

OSUTestingProgram



ConnectorTests



ConnectorTest– SimpleSpan,PositiveBending



ConnectorTestResults



Orthotropic Stiffness Testing




West

12 in.

88 in.

4 in.2.25 in. Concrete slab

2 in. roller

5 ply CLT

W30x311

W14x176

W14x145

Strong Floor

Servo-hydraulic Actuator



Orthotropic Stiffness Results



Orthotropic Stiffness Results

Ks,strongaxis=16kN/mmKs,weakaxis=2kN/mm



LongTermCreep&ShrinkageTest



LongTermCreep&ShrinkageResults



FullScaleTest



FullScaleTest

• Failureat82,000lbs• Failureload~8xthedesign load• Equivalentbendingmoment to600psfuniform load.



Analysis ofFullScaleTest



FullScaleTest



FullScaleTest Results




Maximumserviceload




Maximumserviceload

Continuous beamcompositestiffness




Maximumserviceload


Simplebeamcompositestiffness




Maximumserviceload


Simplebeamcompositestiffness

Simplebeamnon-compstiffness

1. Thecompetitivenessofstructuralsystemsisaffectedgreatlybythecharacteristicsofthefloor framingsystem.

2. Compositeconcretetoppingslabsareaneffectivewaytoimprove thestrength, stiffness,acousticinsulation, andfireresistanceofCLTfloorplanks.

3. Thecompositebehaviorisaffectedgreatlybythecompositeconnectorselected.Adhesiveconnectorsperformed betterthanmechanical.

4. Compositebehaviorcanbeachievedfornegativebending andcompositeconcreteconnections.

5. Compositebehaviorcanenhancetwo-waybendingbehavior, furtherimproving thespanning capabilitiesofthefloor system.

Conclusions

13SEPTEMBER2017

TIMBER-CONCRETECOMPOSITEFLOORSYSTEMS

ThankYou

QUESTIONS?

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TIMBER-CONCRETE COMPOSITE FLOOR SYSTEMS · 2018-12-17 · TIMBER-CONCRETE COMPOSITE FLOOR SYSTEMS...

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