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Wood constructional

Wood constructional

Wood as a structural material (the bulk of the tree trunk) is used in many industries.

The main advantages of wood are:

  • small proportion
  • high specific strength
  • ability to absorb shocks due to elasticity
  • ease of processing
  • вhigh heat, sound - and electrical properties
  • good chemical resistance to certain acid gases
  • capacity for bonding
  • the ability to quickly connect with nails, screws.

Often used as construction materials such woods as pine, spruce, ash, beech, hornbeam, maple, birch, linden. Drying wet wood along the grain is 1 ... 0.2%, and across - 3 ... 5%.

The greater the density of the wood, so it is stronger. The density is 760 kg/m3 oak, linden - 530 kg/m3. Limit of tensile strength along the fiber is 130 MPa oak, linden - 115 MPa, and in compression - under 52 MPa and 36 MPa. In addition to the advantages of wood has a drawback, which is to limit its application. In the most serious deficiencies include: the ability to fast decay, low heat resistance, low modulus, heterogeneous structure.

To increase the resistance to decay of wood impregnated imprehnatamy in an autoclave under pressure, and applied to the surface (paint) paint and varnishes.

Depending on the processing method and form of the cross section of wood materials are divided into the following types: round building material, lumber, veneer, plywood and pressed wood.

Terraces - purpose and form

Roofs - rafter system