Disadvantages of steel in certain cases.

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Advantages of steel.

· Steel structures can be erected quite rapidly.

· Steel structures in general can be repaired quickly and easily.

· Steel is highly suitable for prefabrication and mass production.

· Steel can be reused after a structure is disassembled.

· Steel buildings can be easily expanded by adding new bays or wings. Steel bridges may be widened.

· Steel structures have relatively good fatigue (усталость) strength.

Disadvantages of steel in certain cases.

Steel structures may be more costly than other types of structures.

· The strength of steel is reduced when heated at temperatures commonly observed in building fires. Also, steel conducts and transmits heat from a burning part of the building quite fast. Consequently, steel frames in buildings must have adequate fireproofing.

· Steel structures are subjected to air, water and corrosion and should be painted regularly. Application of weathering and corrosion-resistant steel may eliminate this problem.

· Steel members are in general more subjected to deformation than reinforced concrete compression members.

TIMBER

The building industry is increasingly recognising the potential results available from working with environmentally focused products i.e. timber, that combine clean aesthetics and structural properties.

Advantages of timber.

· Timber is an excellent insulator: brick-built houses are also known to have outstanding insulating properties, but timber surpasses them.

· Timber is an elastic material: in comparison with brick or concrete walls, timber walls don’t have to be very thick. A 20 cm wall, for example, is strong enough to protect against the winter cold, if it has a proper treatment.

· Timber houses are very attractive; they don’t need special decorative finishes.

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