In the case of stiffened seated connection, to avoid local buckling, typically the ratio of outstanding leg length to its thickness should be :
- Agreater than 8
- Bless than 8
- Cless than 16Correct
- Dgreater than 16
Solution
Concept
Local buckling limit for the outstand of a stiffener
Formula
b/t ≤ 16
Step-by-step solution
1. In a stiffened seat the stiffening angle or plate acts as a column-like outstand under the beam reaction. 2. To avoid local buckling, the ratio of the outstanding leg length to its thickness is kept below about 16.
Explanation
The outstanding leg of the stiffener is prone to local buckling, so the outstand/thickness ratio is limited. A value less than 16 is used for the leg of the stiffening angle.
Why the other options are wrong
"Greater than" ratios (8 or 16) make the leg slenderer and more prone to buckling.
Shortcut
Outstand / thickness < 16.
Common mistake
Choosing less than 8.
Correct answer: C) less than 16