Problem $1$: For the structure shown below $($the same one worked in class$),$ determine the fundamental period $T_1$ assuming ${}_1=0\mathrm{.}6153,{}_2=0\mathrm{.}8658,$ and ${}_3=1\mathrm{.}000.$ How does this estimated fundamental period compare to those calculated in class in term of being realistic?

W$24\backslash$times $104$

PLAN