Open Web Beams † these are particularly suited to long spans with
light to moderate loading. The relative increase in depth will help
resist deflection and voids in the web will reduce structural dead
load.
Perforated Beam † a standard beam section with circular voids cut
about the neutral axis.
Castellated Beam † a standard beam section web is profile cut into
two by oxy-acetylene torch. The projections on each section are
welded together to create a new beam 50% deeper than the
original.
Litzka Beam † a standard beam cut as the castellated beam, but
with overall depth increased further by using spacer plates welded
to the projections. Minimal increase in weight.
Note: Voids at the end of open web beams should be filled with a
welded steel plate, as this is the area of maximum shear stress in a
beam.
Structural Steelwork---Open Web Beams