SITUATION $06$:

A square tied column $450$ mm on each side is reinforced with $8-$D$25$ bars with fy $=415$ MPa $.$ Use $f{c}^{\text{'}}=21$MPa.

Man

$16.$ What is the nominal axial capacity of the section in $KN?$

$($a$.)6088$

b$.4140$

c$.2897$

d$.2691$

$17.$ What is the ultimate axial capacity of the section in KN using $0\mathrm{.}75$ as strength reduction factor?

a$.2897$

$($b$.)2691$

c$.4262$

d$.3957$

$18.$ What is the safe service axial live load in KN if the axial dead load on the column is $820$ KN according to NSCP $2015?$

a$.1029$

$($b$.)1067$

c$.1196$

d$.908$

SITUATION $7$:

$2691=18(820)+1642=1067$

A $300mm300mm$ concrete column which is pin$-$connected at both ends has an unsupported length of $4\mathrm{.}6$ m $.$ The column carries an axial compressive load of $670$ KN and a lateral concentrated load of $90$ KN acting at the mid$-$height of the column. Assuming $Ec=21,840$MPa.

$19.$ What is the Euler buckling load?

a$.6876$ KN

$($b$.)8676$ KN

c$.6786$ KN

d$.6767$ KN

$20.$ What is the magnification factor?

a$.1\mathrm{.}108$

b$.0\mathrm{.}923$

$($c$.)1\mathrm{.}08$

d$.0\mathrm{.}903$

$21.$ What is the total moment including the secondary moment due to lateral deflection?

a$.103\mathrm{.}5KN-r$

b$.114\mathrm{.}68kN-m$

c$.95\mathrm{.}53KN-m$

d$.112\mathrm{.}19kN-m$