$,$ Problem $3(15$ pts$)$

Consider the $3$D frame shown in Figure $3.$ The point load $P=25kN$ is acting at the middle of element $2.$

i$.$ Use SAP$2000$ to find the unknown displacements and the reaction forces at all nodes.

For all elements it holds:

$E=1{10}^{7}k\frac{N}{m^2}$

$G=0\mathrm{.}5{10}^{7}k\frac{N}{m^2}$

$I=0\mathrm{.}025m^4$

$J=0\mathrm{.}01m^4$

Figure $33$D Frame for Problem $3$