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For a channel section loaded parallel to the web, the shear centre lies

  • A.At the tip of one flange
  • B.Outside the section, beyond the web
  • C.At the centroid
  • D.On the web centreline

Answer: B

The flange shear flows form a couple that the web flow alone cannot balance about any point inside the section, so the resultant falls outside it. A load applied at the web will therefore twist a channel, which is why channels are rarely used alone as beams.

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