The GATE Grind

GATE 2019 AE – Question 23

Structures · Flight vehicle structures: torsion, bending and shear of thin-walled sections, loads on aircraft · 1 mark · Multiple choice

When a transverse load on a beam acts through its shear centre,

  1. Twist per unit length is zero.
  2. Shear stress is uniform.
  3. Bending stress is zero.
  4. Shear strain at the shear centre is zero.

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Show answer and explanation

Correct answer: (A) Twist per unit length is zero.

Explanation

The shear centre is the point through which a transverse force must act to produce bending without torsional twist. Consequently twist per unit length is zero, A. This does not eliminate transverse shear stresses or bending stresses, nor does it require uniform shear stress.

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