Question

Which of the following are not correct regarding design of beams with openings?

(a) diameter of circular opening should be restricted to 0.5D

(b) for rectangular stiffened openings depth should be less than 0.7D and length less 2D

(c) for rectangular unstiffened openings, depth should be less than 0.5D and length less than 1.5D

(d) point load should be applied within a distance d from adjacent opening

This question was addressed to me in an interview for internship.

My question is taken from Deflection & Holes in Beams in portion Design of Beams of Design of Steel Structures

Answer 1

The correct choice is (d) point load should be applied within a distance d from adjacent opening

Explanation: General guidelines for design of beams with openings are as follows : (i) The diameter of circular opening should be restricted to 0.5D, where D is depth of beam, (ii) For rectangular unstiffened openings, depth should be less than 0.5D and length less than 1.5D, where D is depth of beam (iii) For rectangular stiffened openings, depth should be less than 0.7D and length less 2D, where D is depth of beam (iv) Point loads should not be applied within a distance d from the adjacent opening.