Multiple choice

An R.C. square footing of side length 2 m and uniform effective depth 200 mm is provided for a 300 mm x 300 mm column. The line of action of the vertical compressive load passes through the centroid of the footing as well as of the column. If the magnitude of the load is 320 kN, the nominal transverse (one way) shear stress in the footing is

  1. 0.26 N/mm2

  2. 0.30 N/mm2

  3. 0.34 N/mm2

  4. 0.75 N/mm2

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A Correct answer
Explanation

One-way shear is checked at a distance 'd' from the face of the column. The shear force is the load on the footing area outside this critical section. Dividing this force by the perimeter (b * d) gives the nominal shear stress.