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The shear centre of a section is the point through which a transverse load must act if

  • A.The shear flow is to vanish
  • B.The section is to buckle symmetrically
  • C.The section is to bend without twisting
  • D.The section is to carry no bending stress

Answer: C

Applying the load anywhere else leaves a residual torque equal to the load times its offset from the shear centre, and the section twists as well as bends. Locating the shear centre is therefore essential before any pure-bending analysis can be trusted.

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