Design pad type foundation for tower with the following data : (1) De…

Previous year question for Essentials of Civil Engineering.

Question

Design pad type foundation for tower with the following data :

(1) Design forces on tower leg :

(a) ultimate compression = 88500 kg

(b) ultimate uplift = 68330 kg

(2) Tower Data :

(a) Height = 48 m

(b) base width = 7 m

(3) Soil data :

(a) S.P.T = 13

(b) in-situ density $\gamma = 1.4\text{ t/m}^3$, $\gamma_{\text{sat}} = 1.0\text{ t/m}^3$, $\theta = 30^{\circ}$

Water table at 1.8 m below ground level

$N_{\text{corrected}}$ for over burden upto 4.5 m depth = 17, $N_q = 22$, $N_{\gamma} = 29.5$. [20]