For the bar assemblages shown in Figures P$3-2$ and P$3-7,$ determine the nodal

displacements, the forces in each element, and the reactions. Use the direct

stiffness method for these problems.

$r=210$GPa

$=4{10}^{-4}{m}^2$

$E=15{10}^6$

$A=3i{n}^2$

$k=20,000l\frac{b}{i}n.(20pts$ For the bar assemblages shown in Figures P$3-2$ and P$3-7,$ determine the nodal

displacements, the forces in each element, and the reactions. Use the direct

stiffness method for these problems.

$r=210$GPa

$=4{10}^{-4}{m}^2$

$E=15{10}^6$

$A=3i{n}^2$

$k=20,000l\frac{b}{i}n.$