Clt mtb seminar_presentation_one
Transcript of Clt mtb seminar_presentation_one
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Designing CLT BuildingsPresented By – Robert De Brincat
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INTRODUCTION CLT Design Considerations• Optimum CLT Design & Building Applications• Strength / Serviceability / Vibration / Fire / Acoustics• Floor, Wall & Lateral Design
CLT Supply & Design Resources• CLT Material Properties & Supplier Involvement• Design Resources Available• Design, Construction & Importation Process• SmartStruct & Tilling Timber
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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 Construction
Suitable Applications & Benefits
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Affordable Housing - Austria
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Das Post Hotel - Austria
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Lee Valley Athletics Village
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Lee Valley Athletics Village
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Lee Valley Athletics Village
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Lee Valley Athletics Village
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Woodlands Trust
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Woodlands Trust
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Woodlands Trust
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Woodlands Trust
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Woodlands Trust
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Woodlands Trust
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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
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CROSS LAMINATED TIMBERAvailable Finishes
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CROSS LAMINATED TIMBERAvailable Finishes
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CROSS LAMINATED TIMBER
Floors – Walls – Shafts
Design Considerations
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CLT FLOOR DESIGNTwo Way Slab Performance
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CLT FLOOR DESIGNTwo Way Slab Performance
Wall Below CLT
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CLT FLOOR DESIGNMoment Capacity
• Moment Capacity Relative to Member Size• Increased with Laminated Area• Increased with Material Area• Increase with Effective Area & Lever Arm
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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
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CLT FLOOR DESIGNLongitudinal Shear Due to Bending
Longitudinal Shear
Solid Section Non Laminated Section
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CLT FLOOR DESIGN
Rolling Shear is Dependent on Many FactorsTimber Species; Cross Layer Density; Lamination Thickness; Moisture
Content; Sawing Pattern; Cross Sectional Size and Geometry
Rolling Shear
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CLT FLOOR DESIGNRolling Shear
• Effective Bending Stiffness Dependent on Rolling Shear• Transverse Layers Modeled as Theoretical Connectors
Between Longitudinal Layers• ϒ Factor → Effective Moment of Inertia → Effective
Bending Stiffness. ϒ = 0 (No Connection) ϒ = 1 (Fully Rigid)
• Rolling Shear Modulus (GR) Predetermined by Supplier
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CLT FLOOR DESIGNDesign Capacities
• Rolling Shear Modulus used to Calculate Effective Bending Stiffness
• Effective Bending Stiffness used to Calculate;– Moment Capacity– Shear Capacity– Deflection
Design Capacities Provided by CLT Manufacturer
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CLT WALL DESIGNTwo Way Wall & Beam Performance
Beam Configuration Wall Configuration
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CLT WALL DESIGNCompression Members
Applicable to both Wall & Column Applications
Pparallel ≤ F’c Aparallel
Pparallel = Load Applied Parallel to the Fibres
F’c = Adjusted Compression Strength
Aparallel = Area of Layers with Fibres Running Parallel to the Direction of the Load
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CLT WALL DESIGNTension Members
Tension Loads can only be Resisted by the Layers where the Grain Runs Parallel to the Applied Load
Tparallel ≤ F’t Aparallel
Tparallel = Load Applied Parallel to the Fibres
F’t = Adjusted Tensile Strength
Aparallel = Area of Layers with Fibres Running Parallel to the Direction of the Load
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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 & Testing
CLT is a Suitable Substitute for Concrete in Lift Shaft & Building Core Design
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CLT LATERAL DESIGNSeismic Design
• CLT Panel Connectors Provide Primary Source of Yielding 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
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CLT CONNECTIONSFloor Details
Single Surface Spline
Internal Spline
Half Lapped
Double Surface Spline
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CLT CONNECTIONSWall/Concrete Floor Details
Metal Bracket Metal Plate Metal Shoe
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CLT CONNECTIONSWall/Floor Details
Straight Screw
Straight Screw
Angled Screw
Steel Bracket
Steel Bracket
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CLT CONNECTIONSWall/Floor Roof Details
Double Bracket
Bracket & Screw Bearing Angle
Block & Screw
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CLT VIBRATION DESIGNMaterial Characteristics
• Damping is Approx. 1%• Area Mass is 50 – 150kg/m2• Fundamental Natural Frequency > 9Hz• Footstep Force causes Transient Vibrations which
can be controlled by the Stiffness & Mass of the CLT Floor Panel
• Span & Slab Depth Dependent
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CROSS LAMINATED TIMBERFire Design
CLT Charring Rate~ 0.82mm/min
• CLT is NOT Timber Framed Construction• Fire Plasterboard Solutions Available
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CROSS LAMINATED TIMBERFire & Acoustic Performance
FRL – 90/90/90Rw – 57Thickness – 284mm
FRL – 90/90/90Rw – 60Thickness – 290mm
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CROSS LAMINATED TIMBERFire & Acoustic Construction
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CROSS LAMINATED TIMBERFire & Acoustic Construction
Acoustic Layer
Plasterboard Ceiling
Ceiling Insulation
5 Layer CLT
2 x Layers Fire Check
70mm Concrete Topping
Wooden Floor Covering
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CROSS LAMINATED TIMBERTermite Control
Termite Management is dealt with in accordance with AS3660.1 – 2000
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CLT PROPERTIES & PERFORMANCEVariation Between Manufacturers
• CLT Design & Material Properties Predetermined and Provided by CLT Manufactures
• CLT Products Differ in Material Properties and Design Performance
• Importance of Obtaining Specific CLT Information from Local Australian Suppliers
• Importance of Early Involvement from Suppliers
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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
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BALANCING ACT
Strength & Serviceability Vs. Fire & Acoustics Construction Depth Vs. Floor to Ceiling Height
Wall Height Vs. Importation CostPanel Optimisation Vs. Construction Time
EARLY CLT SUPPLIER INVOLVEMENT IS VERY IMPORTANT
CLT DESIGN & CONSTRUCTIONWhat Governs the Design?
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CROSS LAMINATED TIMBERImportation Professionals
• Importation Capacity for Manufacture, Storage & Delivery• Importation Distance & Lead Time Management• Risk Management & Contingency Plans
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What is SMARTSTRUCT?
Design – Fabrication – Supply – Construction
Design Tender Construct
COLLABORATION COLLABORATION COLLABORATION
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SMARTSTRUCT CLT PROPOSAL SERVICE
Concept Design
Preliminary CLT Design
CLT Panel Optimisation
CLT Supply Cost
CLT Construction Cost
CLIENT
– Architectural Layout
– Material Wastage
– Transport Cost
– Construction Cost
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CLT DESIGN & CONSTRUCTION PROCESS
CLT Delivery to SmartStruc
CLT Manufacture
Shop Drawing Approval
CLT Shop Drawings
CLT Delivery to Site & Install
PROJECT DESIGN
FINISH CONSTRUCTION
PROJECT TENDER
START CONSTRUCTION
Fire Engineered Solution
PCA
Acoustic Consultant
OCCUPATION CERTIFICATE
Building Inspections
SmartStruct Engineer
Architect Services
CLIENT
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