Solution to Problem 110 Normal Stress

$P_w = 1800 \, [ \, \frac{1}{4} \pi (8^2) \,]$

$P_w = 90\,477.9 \, \text{lb}$
 

From FBD of Wood:
 

$P = P_w = 90\,477.9 \, \text{lb}$
 

For concrete:
$P_c = \sigma_c \, A_c$

$P_c = 650(12^2)$

$P_c = 93\,600 \, \text{lb}$
 

From FBD of Concrete:
 

$P = P_c = 93\,600 \, \text{lb}$
 

For safe load P,
$P = 90\,478 \, \text{lb}$           answer