Question

A sudden increase or decrease in shear force diagram between any two points indicates that there is

• A. no loading between the two points
• B. concentrated load between the two points
• C. uniformly distributed load between the two points
• D. uniformly varying load between the two points.

Hint:

Visual rules for SFDs:
- Vertical Jump $\rightarrow$ Point Load.
- Sloped Straight Line $\rightarrow$ Uniformly Distributed Load (UDL).
- Horizontal Line $\rightarrow$ No Load.
- Curve $\rightarrow$ Varying Load.

Answer 1

The Correct Option is B

Step 1: Understanding the Question:
What causes sudden vertical jump in shear force diagram?

Step 2: Key Relationship (Alternate):
dV/dx=-w. Concentrated load acts as infinite intensity over zero distance → instantaneous change in V.

Step 3: Detailed Explanation:
No load → SF constant (horizontal line). UDL → SF linear (sloped line). UVL → SF parabolic. Point load → SF jumps by magnitude of load at that point. Upward load = upward jump, downward load = downward jump.

Step 4: Final Answer:
A concentrated load causes a sudden increase or decrease in SFD.