QUESTION $5$

a$)$

The column shown in Fig. P$11-1$ is made of $4000$ psi concrete and Grade$-60$ steel.

$($a$)$ Compute the theoretical capacity of the column for pure axial load.

$($b$)$ Compute the maximum permissible $P_n$ for the column.

Why does a spiral improve the behavior of a column?

Why are tension splices required in some columns?

$(15$ marks$)$

QUESTION $5$

$($b$)$

Compute the balanced axial load and moment capacity of the column shown in Fig. P$11-1.$ Use $f_c^{\text{'}}=4000$ and $f_y=60,000.$