Discussion
Assertion (A): Shear lag makes the measured stress in a wide flange lower than simple theory predicts.
Reason (R): Load reaches the outer flange material by shear, and that transfer takes distance.
Select the correct answer from the options below.
Answer: B
Both statements are true and the second is the reason for the first. Material far from a web is never fully stressed, so counting the whole flange as working overstates the section's capability. Designers use an effective width instead.
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