Which of following statement(s) is / are true regarding calculating the effective cross-sections of a member while designing a Steel Structure? i. The properties of effective cross-section shall be calculated by deducting the sectional area in excess of effective plate width from the area of the gross cross section. ii. The properties of effective cross-section shall be calculated by deducting the sectional area of all the holes in the section except for parts in compression, from the area of the gross cross section. iii. While deriving the effective cross-sectional area for a section with punched holes, hole size 2 mm in excess of the actual diameter may be deducted.
- AOnly (i)
- B(i) and (ii)
- C(ii) and (iii)
- D(i), (ii) and (iii)Correct
Solution
Concept
Effective cross-section (IS 800 cl. 3.6)
Step-by-step solution
1. Effective width limits and shear lag reduce the gross area (i). 2. Holes are deducted except in compression parts (ii). 3. For punched holes, the hole size taken is 2 mm more than the nominal (iii).
Explanation
All three statements are in line with the effective-section provisions of IS 800.
Why the other options are wrong
Other options leave out a correct statement.
Shortcut
All three statements are code provisions.
Correct answer: D) (i), (ii) and (iii)