A 'castellated beam' is fabricated by:
Choose the correct answer
Adding plates to existing I-section
Cutting web in zigzag pattern, offsetting halves, rewelding — increases depth by 50–60% with same weight; web openings for services
Compressing solid rectangular billets at high pressure
Using two channels connected back-to-back
Correct Answer
B. Cutting web in zigzag pattern, offsetting halves, rewelding — increases depth by 50–60% with same weight; web openings for services
Why is this the answer?
Castellated beam: I-section beam with web cut in a zigzag pattern and the two halves welded back together after offsetting — creates hexagonal/cellular openings in web. Result: increased section depth (50–60% taller than original) → higher moment of inertia, higher bending stiffness → reduced deflection. Web openings: allow services (ducts, pipes) to pass through — reduces floor-to-floor height in buildings. Weight same as original I-section. Used for: long span roofs, floors where services integration needed.
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