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Question

A reinforced square footing of size 2m and uniform effective depth 200mm is provided for a 350mm×350mm column. The line of action of ultimate vertical compression load of 360kN passes through the centroid of the footing as well as the column. The nominal transverse one way shear stress (in MPa, round off to two decimal places) in the footing is ______.
  1. 0.27

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Solution

The correct option is A 0.27
Net upward pressure, q=PuAf=3602×2=90kN/m2

Factored vertical shear force at critical section
Vu=90kNm2×(10.3520.2)×2
=112.5kN

Nominal shear stress (τv)=Vubd
=112.5×10002000×200=0.28N/mm2

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