Discussion
Assertion (A): A transverse load applied at the web of a channel section twists it.
Reason (R): The shear centre of a channel lies outside the section.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. The flange shear flows form a couple whose resultant falls outside the material, so a load anywhere on the web leaves a residual torque. Channels are rarely used alone as beams for this reason.
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