Needs to be done with SAP$2000$ and Excel

P$4\mathrm{.}47$ Compuler asalysis of a traes. The purpose of this

suady is to show that the mapnirade of sbe jover

dilplucementr as well as the mapnitude of the

forces in members may cortrol the proponions

of structural menber. For eumple, building

codes typically specify maximan permitind dirplace$-$

ments to ensure that excessine cracking of artached cen$-$

struction, sech as exierior walls and sindoes$.$ does nos

occur $($see Plowo $1\mathrm{.}1$ in Sec. $13)$

A preliminary design of the trass in Figure P$4\mathrm{.}47$

produces the following bur arcas: member $1,25i{n}^2.$

nember $2\mathrm{.}3i{n}^2,$ and member $3\mathrm{.}2$ in $,$ Also $E=29\mathrm{.}000$

kipsin ${?}^2.$

Case It Determine all bar forces. joiet reactions, and

jsist displacements, assuming pin joins. Use the com$-$

puler program to plot the dellected thape.

Case $2$: If the mavimum horizonal displocement of

joint $2$ is not to exceed $0\mathrm{.}25$ in devemnine the minimum

required arra of the truss bars. For this case aswme that

ell truss members have the same cross$-$sectional ave

Round the area to the nearast whole aamber.

P$4\mathrm{.}47$

Case $1$