고체역학 (Gere) — Tension, Compression, and Shear: Problem 1.3-20

1.3-20 A plane frame is restrained at joints $A$ and $D$, as shown in the figure. Members $AB$ and $BCD$ are pin connected at $B$. A triangularly distributed lateral load with peak intensity of $80 \text{ N/m}$ acts on $CD$. An inclined concentrated force of $200 \text{ N}$ acts at the mid-span of $BC$. (a) Find reactions at supports $A$ and $D$. (b) Find resultant forces in the pins at $B$ and $C$.