283757893275

320 Barry’s Advanced Construction of Buildings
Bolt welded to
inside of channel
fits to steel stud
welded to column
Two box channels form
hollow square column
Castella beam bolted to
T-section cleat fillet
welded to column
Stud
Box channel
as tie
Figure 5.46 Cold roll-formed sections – connections.
the hollow section to align exactly the holes to be drilled. Flowdrill jointing is the preferred
method of making site connections to hollow sections for the benefit of economy in materials
and site labour, and the security of the bolted connection.
Cold strip sections
Beam to column connections
These connections are made by means of protruding studs or T’s welded to the columns
and bolted to the beams. Studs welded to columns are bolted to small section beams and
ties, and larger section beams to T-section cleats welded to columns, as illustrated in Figure
5.46. The T-section cleat is required for larger beams to spread the bearing area over a
sufficient area of thin column wall to resist buckling.
5.6 Fire protection of structural steelwork
To limit the growth and spread of fires in buildings, the Regulations classify materials in
accordance with the tendency of the materials to support spread of flame over their surface,
which is also an indication of the combustibility of the materials. Regulations also impose
conditions to contain fires inside compartments to limit the spread of flame. To provide
safe means of escape, the Regulations set standards for the containment of fires and the
associated smoke and fumes from escape routes for notional periods of time deemed
adequate for escape from buildings.
One aspect of fire regulations is to specify notional periods of fire resistance for the
loadbearing elements of a building so that they will maintain their strength and stability