The use of steel tubular sections provides for strong, light and profitable structures and as a result offer a host of possibilities in terms of application (expressive capacity). The use of these products also facilitates designs with a greater aesthetic appeal.
Their main advantages are as follows :
Protecting steel tubular sections by means of surface coating is easier and more economical than open sections due to the absence of cavities and the lower surface area to be covered.
Structures made from Tubular Sections offer higher fire resistance than open sections due to a lower surface area exposed to fire in relation to mass(lower form factor/mass). Mixed structures based on tubular sections filled with concrete, show excellent behaviour in the presence of fire because of a delay due to the higher thermal inertia.
Filled with water, or when water flows through them due to the thermalsiphon effect, irrigated structures provide almost unlimited fire resistance. Maintenance of water circulation, with the replacement of any losses that might occur due to vaporisation, ensures that the structure is cooled in such a way that gradually the temperature stabilizes at values not very much higher than the water status change temperature and very much lower, therefore, than the critical temperature of steel. In addition to:
Dimensions & Properties of Square Hollow Sections