Practice of castellated beams (CBs) or perforated beams
for several structures speedily gaining petition. This is because of
the increased depth in the segment, high strength to weight ratio,
light in weight, easy to erect, economical, and stronger. The
principal advantages of the castellated beam are an attractive
provision, an increase in vertical bending stiffness, & ease of
service provision. The CBs is prepared from its virgin sections i.e.
I beam by cutting it in a zigzag or any suitable cutting pattern and
again rejoined it by welding therefore depth of the resulting
section increases. The load-carrying capacity of the parent I
section is increased with the same quantity of material and weight,
due to an increase in depth of beams. Web post-buckling and
lateral-torsional buckling failure occur when these beams are
subjected to loading, this is the effect of an increase in depth of the
castellated beams. There are five basic failure modes associated
with castellated steel beams that need to be taken care of 1)
Development of flexure mechanism. 2) Lateral-torsional buckling
3) Vierendeel mechanism 4) rupture of the welded joint in a web
post 5) shear buckling of a web post. Therefore, in this research
paper, an effort has been made to estimate the torsional moment
capacity castellated beam for hexagonal or honeycomb opening
with 300, 450, 600 & sinusoidal opening with different fillet radii.