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Question

Which of the following constant factors relates stress in the steel linearly with stress in adjoining concrete?

A.

Poisson's ratio

B.

 Young's modulus 

C.

Shear modulus 

D.

Modular ratio

Answer ( Option D)

Modular ratio

Solution

  • Working stress method does not considered the mode of failure of the structure that whether it is ductile or brittle.
  • Also the reserve strength of the material beyond yield point is not considered in this method of Design.
  • Reinforced concrete is a composite material.
  • The WSM assumes the strain compatibility, whereby the strain reinforcing steel is assumed to be equal to that in the adjoining concrete to which it is bonded.
  • Consequently the stress in concrete by a constant factor, called the modular ratio, defined as the ratio of modulus of elasticity of steel to that of concrete.
  • The WSM therefore also known as modular ratio method.
  • Modular ratio is given by


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