A symmetrical framework consisting of three pin$-$connected bars is loaded by a force P $($see figure$).$ The

angle between the inclined bars and the horizontal is $=60.$ The axial strain in the middle bar is measured

as $0\mathrm{.}0361.$

The frame is constructed of a copper alloy having the following stress$-$strain relationship:

$=\frac{18000}{1+300},00\mathrm{.}03,(in$ ksi$)$

Determine:

a$.$ The axial strain of the outer bars in the loaded condition.

b$.$ The tensile stress in the outer bars

c$.$ The yield strength of the copper alloy.

Answer:

a$.lo{n}_{CD}=$

$0\mathrm{.}0271$

$b*{}_{CD}(ksi)=$

$53\mathrm{.}43$

c$.{}_Y(ksi)=$