Question $2$:

$(30$ Marks$)$

$1-$ Using the tributary area method, find the service and ultimate loads at the foundation level of column D$-2($The column located at the intersection of axis D & axis $2).(5$ Marks$)$

$2-$ If column D$-2$ was subjected to a pure axial load of $4000$ kN $,$ is it safe? If not, what can be done to make it safe? $(5$ Marks$)$

$3-$ If column D$-2$ was subjected to an axial load of $3000$ kN in addition to a bending moment of $1200kN.m,$ is it safe? If not, what can be done to make it safe? $(10$ Marks$)$

$4-$ Calculate and draw the rectilinear $($internal$)$ ties of Col D$-2$ as required by ACI $318-14(5$Marks$).$

$5-$ As per the ACI $318-14,$ determine the required vertical spacing between the ties of Col D$-2?(5$Marks$)$

Notes:

Ignore the column self$-$weight and the partition$/$wall loads.

Use Concrete cover equals to $30\mathrm{.}0mm.$

Refer to the figure for the application direction of the moment.

Do not interpolate when using the interaction diagrams, use only the nearest chart.

Illustrate the required calculations to obtain the needed rectilinear ties.