Discussion
For a channel section, with its axis of symmetry horizontal, the shear centre lies at :
Answer: B
The shear centre lies outside the section.
The shear centre is the point through which a transverse load must act for the beam to bend without twisting. For a channel with its axis of symmetry horizontal, it lies on that axis but beyond the web, on the side away from the flanges, because the shear flows in the two flanges form a couple that has to be balanced by moving the load line back past the web.
It does not coincide with the centroid, which is inside the section between the web and the flange tips. It is also not at the junction of the axis and the web centre line; it is a definite distance behind the web.
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