1.

Which of the following relation is correct for design of channel/I-section purlin?(a) (Mz/Mdz) + (My/Mdy) ≥ 1(b) (Mz/Mdz) + (My/Mdy) ≤ 1(c) (Mdz/Mz) + (My/Mdy) ≤ 1(d) (Mdz/Mz) + (Mdy/My) ≥ 1The question was posed to me during a job interview.The question is from Purlins topic in portion Design of Beams of Design of Steel Structures

Answer»

Correct option is (b) (Mz/Mdz) + (My/Mdy) ≤ 1

To EXPLAIN I WOULD say: The local capacity of the SECTION is checked by interaction equation. It is given by (Mz/Mdz) + (My/Mdy) ≤ 1 , where Mdz and Mdy are design moment capacity about Z and Y AXES, respectively, and Mz and My are factored bending moments about Z and Y axes, respectively.



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