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Strength of Materials

Shear Stress in I Section

A simply supp...

Question

A simply supported I beam with its web horizontal is shown in the given figure. It is subjected to a vertical load

The shape of the shear stress distribution in the cross-section of the beam under the load would be

A

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B

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C

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D

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Solution

The correct option is D

Shear stress varies in parabolic shape across a rectangular cross section. Value at top and bottom is zero and maximum at neutral axis. Shear stress will be zero at A and will increase upto B parabolically. As the width in figure increase suddenly near B shear stress will decreases suddenly. Diagram will be symmetric about NA.

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