Problem $2$

Refer to the figure below which shows a flexible rectangular footing on the ground surface. Given: $B_{(1)}=4$

$ft,B_{(2)}=6ft,L_{(1)}=8ft,$ and $L_{(2)}=10ft.$ If the area is subjected to a uniform load of $3000l\frac{b}{f}{t}^2,$ determine

the stress increase at a depth of $10ft$ located immediately below point $O.$