Question

If $d$ is the distance between the flange angles, the vertical stiffeners in plate girders are spaced not greater than

• A. $d$
• B. $1.25d$
• C. $1.5d$
• D. $1.75d$

Hint:

Vertical stiffeners help increase the shear buckling resistance of the web in plate girders.

Answer 1

The Correct Option is B

Step 1: Purpose of vertical stiffeners.
Vertical stiffeners in plate girders are provided to prevent buckling of the web due to shear forces.
Step 2: Code-based spacing rule.
Design recommendations specify that the spacing of vertical stiffeners should be limited relative to the depth of the web (distance between flange angles).
Step 3: Standard spacing criterion.
As per standard design practice, the maximum spacing of vertical stiffeners should not exceed:
\[ 1.25d \]
Step 4: Conclusion.
Therefore, the correct answer is (B) $1.25d$.