Topic: Strength of Materials
A beam is fixed at one end and is vertically supported at the other end. What is the degree of statical indeterminacy?
- A. 1
- B. 2
- C. 3
- D. 4
Answer: A. 1
Explanation: For a propped cantilever beam, there are four reactions: $R_{H}$, $R_{A}$, $M_{A}$ at the fixed end, and $R_{B}$ at the vertical support. There are three independent equations of static equilibrium ($\sum H=0$, $\sum V=0$, and $\sum M=0$). Therefore, the degree of static indeterminacy = No. of Reactions - No. of equilibrium equations = $4 - 3 = 1$.