Consider the following statements:
I. If a beam has two axis of symmetry, even then shear -centre does not coincide with
the centroid.
II. For a section having one axis of symmetry, the shear-centre does not coincide with the centroid but lies on the axis of
symmetry.
III. If a load passes through the shear-centre, then there will be only bending in the cross-section and no twisting.
Which of these statements are correct?
Shear Centre
The shear centre is the point on the cross-section of a beam through which the resultant shear force must pass so that
the beam bends without twisting.
· The shear centre is also known as the centre of twist.
· For sections symmetric about both axes, the shear centre coincides with the centroid.
· For sections symmetric about one axis only, the shear centre lies on the axis of symmetry.
· When the external load passes through the shear centre, the beam undergoes pure bending only, and no twistingPreparing students for success in a changing World.
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