Clt mtb seminar_presentation_one


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Clt mtb seminar_presentation_one

  1. 1. Designing CLT BuildingsPresented By – Robert De Brincat
  2. 2. INTRODUCTIONCLT Design Considerations• Optimum CLT Design & Building Applications• Strength / Serviceability / Vibration / Fire / Acoustics• Floor, Wall & Lateral DesignCLT Supply & Design Resources• CLT Material Properties & Supplier Involvement• Design Resources Available• Design, Construction & Importation Process• SmartStruct & Tilling Timber
  3. 3. CROSS LAMINATED TIMBER PROJECTS• Optimum Slab Span – 4.5m to 5.5m• Simple Compartment & Wall Layouts• Minimal Load Transfer Between Floors• Optimum Building Height – 5 to 8 Levels• Residential & Commercial Developments• Lightweight Construction & Poor Foundations• Speed of ConstructionSuitable Applications & Benefits
  4. 4. Affordable Housing - Austria
  5. 5. Das Post Hotel - Austria
  6. 6. Lee Valley Athletics Village
  7. 7. Lee Valley Athletics Village
  8. 8. Lee Valley Athletics Village
  9. 9. Lee Valley Athletics Village
  10. 10. Woodlands Trust
  11. 11. Woodlands Trust
  12. 12. Woodlands Trust
  13. 13. Woodlands Trust
  14. 14. Woodlands Trust
  15. 15. Woodlands Trust
  16. 16. CROSS LAMINATED TIMBERAvailable Finishes• Architectural Visual Finish– Smoothly Edge Glued– Individual Boards Planned• Industrial Visual Finish– Individual boards Sanded or Brushed• Non-Visual Finish– Unexposed Panels
  17. 17. CROSS LAMINATED TIMBERAvailable Finishes
  18. 18. CROSS LAMINATED TIMBERAvailable Finishes
  19. 19. CROSS LAMINATED TIMBERFloors – Walls – ShaftsDesign Considerations
  20. 20. CLT FLOOR DESIGNTwo Way Slab Performance
  21. 21. CLT FLOOR DESIGNTwo Way Slab PerformanceWall Below CLT
  22. 22. CLT FLOOR DESIGNMoment Capacity• Moment Capacity Relative to Member Size• Increased with Laminated Area• Increased with Material Area• Increase with Effective Area & Lever Arm
  23. 23. CLT FLOOR DESIGNMoment Capacity• Moment Capacities Vary between CLT Products• Moment Capacity Provided by CLT Supplier• Importance of Understanding Moment Capacity– Longitudinal Shear Due to Bending– Rolling Shear Between Timber Layers– Effective Bending Stiffness
  24. 24. CLT FLOOR DESIGNLongitudinal Shear Due to BendingLongitudinal ShearSolid Section Non Laminated Section
  25. 25. CLT FLOOR DESIGNRolling Shear is Dependent on Many FactorsTimber Species; Cross Layer Density; Lamination Thickness; MoistureContent; Sawing Pattern; Cross Sectional Size and GeometryRolling Shear
  26. 26. CLT FLOOR DESIGNRolling Shear• Effective Bending Stiffness Dependent on Rolling Shear• Transverse Layers Modeled as Theoretical ConnectorsBetween Longitudinal Layers• ϒ Factor → Effective Moment of Inertia → EffectiveBending Stiffness. ϒ = 0 (No Connection) ϒ = 1 (Fully Rigid)• Rolling Shear Modulus (GR) Predetermined by Supplier
  27. 27. CLT FLOOR DESIGNDesign Capacities• Rolling Shear Modulus used to Calculate EffectiveBending Stiffness• Effective Bending Stiffness used to Calculate;– Moment Capacity– Shear Capacity– DeflectionDesign Capacities Provided by CLT Manufacturer
  28. 28. CLT WALL DESIGNTwo Way Wall & Beam PerformanceBeam Configuration Wall Configuration
  29. 29. CLT WALL DESIGNCompression MembersApplicable to both Wall & Column ApplicationsPparallel ≤ F’c AparallelPparallel = Load Applied Parallel to the FibresF’c = Adjusted Compression StrengthAparallel = Area of Layers with Fibres Running Parallel to theDirection of the Load
  30. 30. CLT WALL DESIGNTension MembersTension Loads can only be Resisted by the Layerswhere the Grain Runs Parallel to the Applied LoadTparallel ≤ F’t AparallelTparallel = Load Applied Parallel to the FibresF’t = Adjusted Tensile StrengthAparallel = Area of Layers with Fibres Running Parallel to theDirection of the Load
  31. 31. CLT LATERAL DESIGNShear Walls & Diaphragms• Resistance to Wind & Seismic Loadings• Wall & Floor Panels Designed as Shear Walls & Diaphragms• Panel Shear Strength will vary based on Fastener Size,Fastener Spacing, Fastener Location, & CLT Shear Strength• Deflection Determined by Engineering Principles & TestingCLT is a Suitable Substitute for Concrete in LiftShaft & Building Core Design
  32. 32. CLT LATERAL DESIGNSeismic Design• CLT Panel Connectors Provide Primary Source ofYielding while CLT Panel Remains Elastic• Special Seismic Detailing Required for CLT– Fasteners Loaded in Shear– CLT Member Design at Connections– Nominal Connection Capacity– Fastener Withdrawal
  33. 33. CLT CONNECTIONSFloor DetailsSingle Surface SplineInternal SplineHalf LappedDouble Surface Spline
  34. 34. CLT CONNECTIONSWall/Concrete Floor DetailsMetal Bracket Metal Plate Metal Shoe
  35. 35. CLT CONNECTIONSWall/Floor DetailsStraight ScrewStraight ScrewAngled ScrewSteel BracketSteel Bracket
  36. 36. CLT CONNECTIONSWall/Floor Roof DetailsDouble BracketBracket & ScrewBearing AngleBlock & Screw
  37. 37. CLT VIBRATION DESIGNMaterial Characteristics• Damping is Approx. 1%• Area Mass is 50 – 150kg/m2• Fundamental Natural Frequency > 9Hz• Footstep Force causes Transient Vibrations whichcan be controlled by the Stiffness & Mass of theCLT Floor Panel• Span & Slab Depth Dependent
  38. 38. CROSS LAMINATED TIMBERFire DesignCLT Charring Rate~ 0.82mm/min• CLT is NOT Timber Framed Construction• Fire Plasterboard Solutions Available
  39. 39. CROSS LAMINATED TIMBERFire & Acoustic PerformanceFRL – 90/90/90Rw – 57Thickness – 284mmFRL – 90/90/90Rw – 60Thickness – 290mm
  40. 40. CROSS LAMINATED TIMBERFire & Acoustic Construction
  41. 41. CROSS LAMINATED TIMBERFire & Acoustic ConstructionAcoustic LayerPlasterboard CeilingCeiling Insulation5 Layer CLT2 x Layers Fire Check70mm Concrete ToppingWooden Floor Covering
  42. 42. CROSS LAMINATED TIMBERTermite ControlTermite Managementis dealt with inaccordance withAS3660.1 – 2000
  43. 43. CLT PROPERTIES & PERFORMANCEVariation Between Manufacturers• CLT Design & Material Properties Predeterminedand Provided by CLT Manufactures• CLT Products Differ in Material Properties andDesign Performance• Importance of Obtaining Specific CLT Informationfrom Local Australian Suppliers• Importance of Early Involvement from Suppliers
  44. 44. CLT DESIGN RESOURCES• Supplier Specific Material Properties• Spanning & Pre-dimensioning Tables• Preliminary Design Software (EURO & AUS Codes)• CADE Systems Engineering Design Software– New CLT Modeling Component– Based on the AUS Standards– Flexible CLT Sectional Analysis– Design Coordination with other Construction Materials
  45. 45. BALANCING ACTStrength & Serviceability Vs. Fire & AcousticsConstruction Depth Vs. Floor to Ceiling HeightWall Height Vs. Importation CostPanel Optimisation Vs. Construction TimeEARLY CLT SUPPLIER INVOLVEMENT IS VERY IMPORTANTCLT DESIGN & CONSTRUCTIONWhat Governs the Design?
  46. 46. CROSS LAMINATED TIMBERImportation Professionals• Importation Capacity for Manufacture, Storage & Delivery• Importation Distance & Lead Time Management• Risk Management & Contingency Plans
  47. 47. What is SMARTSTRUCT?Design – Fabrication – Supply – ConstructionCOLLABORATION COLLABORATION COLLABORATION
  48. 48. SMARTSTRUCT CLT PROPOSAL SERVICEConceptDesignPreliminaryCLT DesignCLT PanelOptimisationCLT SupplyCostCLTConstructionCostCLIENT– Architectural Layout– Material Wastage– Transport Cost– Construction Cost
  49. 49. CLT DESIGN & CONSTRUCTION PROCESSCLT Deliveryto SmartStrucCLT ManufactureShop DrawingApprovalCLT ShopDrawingsCLT Delivery toSite & InstallPROJECTDESIGNFINISHCONSTRUCTIONPROJECTTENDERSTARTCONSTRUCTIONFire Engineered SolutionPCAAcoustic ConsultantOCCUPATIONCERTIFICATEBuildingInspectionsSmartStruct EngineerArchitect ServicesCLIENT