Conventional design process is normally based on the ‘local’ structural elements (column, beam, floor slabs, wall, etc.) But theoretical and experimental studies have shown that structural systems cannot be considered to be a simple collection of individual elements. The responses of the structure is often more than the ‘sum’ of the responses of individual elements since
There are 3 main classes of preservatives
Oily substances insoluble in water
Water-soluble salts
Salts carried in volatile solvent other than water.
A) Oily Preservatives
Coal-tar is the best known ►most widely used preservative
Obtained from bituminous coal
Available in many grades ► gives satisfactory results