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Timber Houses and Buildings in New Zealand
 

Timber Houses and Buildings in New Zealand

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Timber Houses and Buildings in New Zealand

Timber Houses and Buildings in New Zealand
Presentation at CTT CORMA 14 May 2010
Graeme Beattie, Principal Structural Engineer, BRANZ

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    Timber Houses and Buildings in New Zealand Timber Houses and Buildings in New Zealand Presentation Transcript

    • Timber Houses and Buildings in New Zealand Graeme Beattie, Principal Structural Engineer, BRANZ (graeme.beattie@branz.co.nz) Presentation at CTT CORMA 14 May 2010
    • Timber Buildings
      • Content of presentation
        • Typical Timber Framed Houses
        • Materials and sizes
        • Building Standards/Regulations
        • House Design
        • Earthquake bracing
        • Large Timber Buildings
    • Timber Framed Houses Older houses – before 1980
    • Timber Framed Houses New houses – since 1980
    • Timber Framed Houses
    • Timber Framed Houses Pressed metal roof tiles Brick as a cladding – not structural
      • Radiata pine or Douglas Fir
      • 90mm x 45mm plates and studs at 400mm or 600mm centres
      • 45mm thick joists up to 300mm deep or manufactured joists (I beams, LVL)
      • 45mm thick trusses
      Typical Framing
    • Typical Timber Framing Truss Wall frame Timber floor
      • Building Act (of Parliament) – the Law
      • New Zealand Building Code Compliance
      • Building Standards
      • Specific design Non-specific design
      • (NZS3603 – Multistorey (NZS3604 - Houses)
      • Buildings)
      Regulations
      • Recipe book
      • Tells how to build a timber house
        • Sizes, Spans, Bracing requirements, Fixings
      • No engineer required
      • Maximum 2 storeys
      • www.standards.co.nz
      NZS 3604:1999
      • Bracing requirements determined by:
        • Wind load
        • Earthquake load
        • Number of storeys (maximum 2)
        • Weight of roof
        • Weight of cladding
        • Soil must be “good” – min. 300kPa ULS bearing
        • Wall bracing usually by sheet/panel products on internal walls (and inside exterior wall)
          • Tested to find bracing capacity (P21 test)
      NZS 3604:1999
    • Wall Bracing Test (BRANZ P21) Jack and loadcell Test Specimen (Drywall) Load Load is cyclic to increasing Displacements www.branz.co.nz
    • Example Hysteresis Loops
    • Wall Bracing Hold down Concrete Floor on ground 25mm x 1mm strap wrapped under plate and nailed to stud 12mm bolt and 50mm square washer
      • Proprietary hold down (Handibrac)
      Wall Bracing Hold down alternative Sheet Lining
      • Specific design (engineer involved)
      • Light timber framing (LTF)
        • Apartments (many walls for bracing)
        • Must solve noise and fire issues
      • Heavy sections
        • Laminated Veneer Lumber (LVL)
      Multistorey Timber Buildings
    • Multistorey LTF
    • Joints Between Tenancies Important to maintain continuity of floor diaphragm Floor Topping Plasterboard
      • Box sections built with LVL flat sections
      • Steel post-tensioning of beams to columns
      • Building returns to original shape after earthquake
      Multistorey - Heavy Sections LVL Box Beam LVL Box Column Post tensioning cable
    • Multistorey - Heavy Sections University of Canterbury STIC Project www.stic.co.nz for other information/videos
      • Timber framed houses have been constructed for more than 100 years in New Zealand
      • They have been engineered for 30 years
      • They have good earthquake resistance
      • Multistorey timber design options are being developed
      Conclusions
      • Thank you
      • Questions?