needs to be done with SAP$2000$ and Excel

P$4\mathrm{.}47$ CQNTINUED

Deflected Shape $($horizontal deflection at inint $2=0\mathrm{.}402$ in $)$

Case $2$

From the computer analysis, the horizontal deflection at joint $2$ is $1\mathrm{.}303$ in if the area of all truss members is set equal to $1i{n}^2.$ To limit the deflection to $0\mathrm{.}25$ in$,$ the minimum required area is $(1\mathrm{.}0i{n}^2)(\frac{1\mathrm{.}303}{0\mathrm{.}25})=5\mathrm{.}212i{n}^2.$ Round this area to $6i{n}^2.$

Page $4-47$b$.$