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Future Steel Buildings, Business, Page 18

Future Steel Buildings

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Framed tubes allow fewer interior columns therefore more floor
space is available.

The tube structural system is a three dimensional structure
composed of 3, 4 or more braced frames or shear walls joined to
form a vertical tube system. This system can be constructed using
steel, concrete or composite material. This type of construction is
used for both office and residential buildings.

Tall buildings due to their height are affected by lateral forces of
strong winds and earthquakes. Structural design should be such
that it resists these forces.

Design requirements of a building can be divided in to 3 classes:

1. Serviceability
2. Resistance to damage
3. Prevention of collapse

Ancient tall buildings used wood, concrete and bricks. Drawbacks
associated with these materials led to the use of wrought iron and
subsequently steel.

Steel frames are faster to erect compared to other materials. This
gives economic advantages. In addition to cost savings, steel
frames if used in tall buildings are lighter and result in
considerably reduced loads on the foundation. Multiple storey
buildings occupy less floor area.

Framed tube structures consist of closely spaced columns joined
by deep girders. Resistance to lateral forces is provided by stiff
frames that form a tube around the perimeter of the building.