고체역학 (Gere) — Tension, Compression, and Shear: Problem 1.3-7

1.3-7 A plane truss has a pin support at $A$ and a roller support at $E$ (see figure). (a) Find reactions at all supports. (b) Find the axial force in truss member $FE$. [Given values from the figure: horizontal spacing between joints $A, B, C, D$ is $3\text{ m}$ each. Vertical height at the left end $AG$ is $4.5\text{ m}$. At the right end, joint $D$ is $3\text{ m}$ above the horizontal level of joints $G$ and $F$, and joint $E$ is $1\text{ m}$ below that same horizontal level. Vertical loads: $13.5\text{ kN}$ at $B$, $9.0\text{ kN}$ at $C$, $4.5\text{ kN}$ at $D$.]