For Problems $9\mathrm{.}16$ to $9\mathrm{.}18,$ design columns for axial load only

for the conditions described. Include the design of ties or spi$-$

rals and a sketch of the cross sections selected, including bar

arrangements. All columns are assumed to be short and not

exposed to the weather. Form sizes are in $50-$mm increments.

$9\mathrm{.}16$: Use number $22$ longitudinal bars. Use concrete cover to center of longitudinal $=70$ mm after verifying it is suitable.

Problem $9\mathrm{.}16$ Square tied column: $P_D=600kN,$

$P_L=800kN,f_c^{\text{'}}=24$MPa, and $f_y=420$MPa. Initially

assume ${}_g=0\mathrm{.}02.$