*Department of Civil Engineering, Arasu Engineering College, Kumbakonam, India
**Department of Civil Engineering, Sona College of Technology, Salem, India
***School of Civil Engineering, SASTRA University, Thanjore
Online published on 9 December, 2016.
A beam with a number of regular openings in its web is called a castellated beam. Castellated beam gain its advantage due to its increased depth of section without any additional weight. Castellated beam has some limitations also; the occurrence of the holes in the web will change the structural performance of the beam from that of plain webbed beams. Stress concentration occurs near the perforations which reduces the shear carrying capacity and stability of the beam.
The shear carrying capacity can be increased by stiffening the web at points of concentrated loads and reactions. Hence, to increase the shear strength of the castellated beam and also to reduce the deflection, diagonal and vertical stiffeners are introduced along the web opening and also on the solid portion of the web along the shear zone.
Steel I sections of ISMB 200 is selected and castellated beams are fabricated, such that depth of the castellated beam is 1.5 times more than the original depth. Experiments are carried out by applying two point loads and deflection of beam is studied and different failure modes are analyzed.
Castellated Beam, Shear Strength, Stiffeners, Diagonal stiffeners, Vertical Stiffener
