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What is castellated beam?

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What is castellated beam?

(a) beam with no openings in web

(b) beam with number of regular openings in web and flange

(c) beam with number of regular openings in web

(d) beam with number of regular openings in flange

This question was posed to me in an internship interview.

Question is taken from Castellated Beams & Lintels topic in division Design of Beams of Design of Steel Structures

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Correct answer is (c) beam with number of regular openings in web

Easy explanation: A beam with number of regular openings in its web is called castellated beam. A castellated beam is formed by flame cutting a single rolled wide flange beam in a definite predetermined pattern and then rejoining the segments by welding to form a regular pattern of holes in the web.

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