Question

The ratio of deflection at the centre for a rigid plate to that of flexible plate of same diameter placed on similar subgrade and subjected to same loading is ____________.

• A. 0.79

Answer 1

The correct option is A 0.79
Deflection at centre of rigid plate
$={\Delta }_1=1.18\frac{pa}{E}$

Deflection at centre of flexible plate
$={\Delta }_2=1.5\frac{pa}{E}$

For constant pressure, radius and E,
Deflection Ratio
$=\frac{1.18}{1.5}=0.787=0.79$