The lap length, for a reinforcement with diameter 'd', in direct tension should be,
- ALd or 30d whichever is greater
- B2Ld or 30d whichever is greaterCorrect
- C30d
- D24d
Solution
Concept
Lap splice length (IS 456 cl. 26.2.5)
Formula
Flexural tension: Ld or 30d; direct tension: 2Ld or 30d
Step-by-step solution
1. IS 456: lap in flexural tension is the greater of Ld or 30d. 2. In direct tension it is the greater of 2Ld or 30d.
Explanation
Direct tension is more critical, so the lap is doubled.
Why the other options are wrong
A is for flexural tension; C and D are not the code rules.
Shortcut
Direct tension → 2Ld.
Correct answer: B) 2Ld or 30d whichever is greater