STRUCTURAL TIMBER DESIGN

STRUCTURAL TIMBER DESIGN

1. Can be used for

   • beams
   • truss
   • girders
   • piles
   • formwork

2. Types of timber

   • softwood
     • quick growth rate
     • poor durability qualities
     • cheaper
     • low density and strength
   • hardwood
     • slow growth rate
     • high density and strength
     • good durability
     • more expensive

3. Defects in timber

   • Natural defects
     • cracks and fissures
     • knots
     • grain defects
     • fungal decay
     • annual ring width
   • Chemical defects
     • tannic acid
     • gums
     • resin
   • Conversion defects
     • wane
   • Seasoning defects
     • cupping
     • end splitting
     • honeycombing
     • bowing

4. Properties of timber

   • Moisture content
   • Density
   • Slope grain
   • Timber defects
   • Timber grading
   • Position in tree
   • Condition of grwoth