Question

1. Based on your understanding of timber, elaborate with examples the following topic:

i) strength and durability of timber

ii) sustainability concept of timber

iii) advantages and disadvantages of timber compared to concrete

(b)       Sketch a single storey house and indicate with reasoning the possible and suitable application of timber as structural and non-structural components of the house.

Answer 1

Strength of timber : Best quality timber has highest strength. It means capable of bear loads. Anisotropic material like timber has different structure at different portion. So strength of timber is different at different points.Grain strength determines the strength of timber. Example: 1. compressive strength: 500kg/cm2 to 700kg/cm2 load is enough to test strength of timber.

2. Tensile strength: when timber is enough strong to the tensile force.

Durability : A good quality timber has a property to resist the attack of infection of fungus or other insects.this resistance quality makes timber better.

Sustainability of timber : Sustainable timber has been refers that harvested responsibly. One tree is cut down to use , another tree is palanted for its replace. Sustainable timber can be softwood or hardwood and it is available on huge range of species. Bamboo is classified as sustainable hardwood since it grows very fast.

Advantages of timber as compared to concrete:- 1. Thermal property . wood doesn't practically expand against heat and its dries and gain more strength.

acoustic properties. Wood prevents echo and noise by absorbing sounds. So it is extensively used in concert halls.

Disadvantages of timber compared to concrete :-

1. Shrinkage and swelling of woods.

2. Deterioration of woods. The main agents is biotic (biological) and a biotic ( non biological).

3. Insects , carpenter ants etc .