$608$ Optimum Structural Design

HW # $3$ Minimum weight of truss graphically

Consider the objective function and the stress, displacement, buckling and vibration constraints of the $3-$bar truss discussed in class, determine graphically the optimal weight $W.$

$L=9m,=45,P=175kN,$

$=+-35$MPa,$=2770k\frac{g}{m^3},E=6\mathrm{.}7{10}^4$MPa,$A_{\text{m}\text{i}\text{n}}=62\mathrm{.}5m{m}^2,$

$A_{\text{m}\text{a}\text{x}}=6\mathrm{.}25{10}^{4}m{m}^2,{}_0=2500Hz,{}_u={}_V=0\mathrm{.}15mm$ and $=1\mathrm{.}0.$ I want the solution from chegg written by hand. Thank you