The minimum edge distance in member with rolled edge is approximately
- A1.5 × hole diameterCorrect
- B1.7 × hole diameter
- C2 × bolt diameter
- D1.7 × bolt diameter
Solution
Concept
Minimum edge distance for rolled edges
Formula
NONE
Step-by-step solution
1. According to IS 800, minimum edge distance depends on whether the edge is hand-flame cut or rolled/machine-cut. 2. For rolled, machine-flame cut, sawn and planed edges, the minimum edge distance is 1.5 times the nominal hole diameter. 3. For hand flame cut edges, the minimum edge distance is 1.7 times the nominal hole diameter. Answer: A
Explanation
Minimum edge distance is calculated based on the hole diameter to prevent shear failure of the plate near the fastener. For members with rolled, machine flame cut, or planed edges, the minimum edge distance is specified as 1.5 times the hole diameter. For hand flame cut edges, this requirement increases to 1.7 times the hole diameter.
Why the other options are wrong
B) 1.7 × hole diameter applies to hand flame cut edges. C) Edge distance is specified in terms of hole diameter rather than bolt diameter. D) Edge distance depends on hole diameter, not bolt diameter.
Shortcut
Rolled edge is smooth so it requires less distance (1.5 × hole diameter) than hand-cut (1.7 × hole diameter).
Common mistake
Confusing the rolled edge requirement of 1.5 times the hole diameter with hand flame cut edges requiring 1.7 times the hole diameter.
Correct answer: A) 1.5 × hole diameter