Question

The new rolled section of castellated beam will have depth

(a) 50% more than original section

(b) 50% less than original section

(c) 25% less than original section

(d) depth does not change

I got this question by my college director while I was bunking the class.

My question is from Castellated Beams & Lintels topic in portion Design of Beams of Design of Steel Structures

Answer 1

Correct answer is (a) 50% more than original section

To explain: The new rolled section of castellated beam will have depth at least  50% more and its section modulus increases by 2.25 times the original section. This allows the beam to span further than parent rolled section.