QUESTION $3(5$ MARKS$)$

A precast concrete pile of $19m$ length having a cross section of $350mm350mm$

is fully embedded in a soil profile as shown in Figure $2.$ The pile carries a

permanent axial load of $450kN($including the self$-$weight of the pile$)$ and an

applied variables axial load of $50kN.$

Figure z sou prome witn embeadea precast concrete pue

Examine the depth of the pile embedded is sufficient to the applied load based

on the followings:

$($i$)$ An allowable stress design $($ASD$)$ with Global FS $=1\mathrm{.}5$ and

$($ii$)$ A limit state design using load and resistance factor design $($LRFD$).$

Comment your finding.

Assume: $N_c=9$ and Model Factor $=1\mathrm{.}4$

Given: Base Resistance: $Q_{Rb}=N_c{c}_u{A}_p$ and Shaft Resistance: $Q_{Rs}={\displaystyle \underset{?}{\overset{?}{}}}{c}_{u}pL$