Question

locate the shear centre for a channel section

Answer 1

if a beam is subjected to bending moments and shear force in a plane, other than the plane of geometry, which passes through the centroid of the section, then bending moment will be accompanied by twisting. In order to avoid twisting and cause bending only, the transverse forces must act through a point which may not coincide with the centroid, but will depend upon the shape of the section and such a point is termed as shear centre.