Question:
A sudden increase or decrease in shear force diagram between any two points indicates that there is
A sudden increase or decrease in shear force diagram between any two points indicates that there is
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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.
- Vertical Jump $\rightarrow$ Point Load.
- Sloped Straight Line $\rightarrow$ Uniformly Distributed Load (UDL).
- Horizontal Line $\rightarrow$ No Load.
- Curve $\rightarrow$ Varying Load.
Updated On: Jul 1, 2026
- no loading between the two points
- concentrated load between the two points
- uniformly distributed load between the two points
- uniformly varying load between the two points.
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The Correct Option is B
Solution and Explanation
Step 1: Understanding the Question:
The question asks what type of loading causes a sudden vertical jump (an instantaneous increase or decrease) in a shear force diagram (SFD).
Step 2: Detailed Explanation:
Let's review the relationship between the loading diagram and the shear force diagram for a beam:
• (A) No loading: If there is no load between two points, the shear force remains constant. The SFD is a horizontal line.
• (C) Uniformly distributed load (UDL): A UDL causes the shear force to change linearly. The SFD is a straight line with a constant, non-zero slope.
• (D) Uniformly varying load (UVL): A UVL (triangular load) causes the shear force to change parabolically. The SFD is a parabolic curve.
• (B) Concentrated load (Point load): A point load is a force applied at a single point. As we move across this point from left to right, the shear force diagram shows a sudden, vertical jump. The magnitude of the jump is equal to the magnitude of the concentrated load. An upward force causes an upward jump, and a downward force causes a downward jump.
Step 3: Final Answer:
A sudden increase or decrease in the shear force diagram indicates the presence of a concentrated load at that point.
The question asks what type of loading causes a sudden vertical jump (an instantaneous increase or decrease) in a shear force diagram (SFD).
Step 2: Detailed Explanation:
Let's review the relationship between the loading diagram and the shear force diagram for a beam:
• (A) No loading: If there is no load between two points, the shear force remains constant. The SFD is a horizontal line.
• (C) Uniformly distributed load (UDL): A UDL causes the shear force to change linearly. The SFD is a straight line with a constant, non-zero slope.
• (D) Uniformly varying load (UVL): A UVL (triangular load) causes the shear force to change parabolically. The SFD is a parabolic curve.
• (B) Concentrated load (Point load): A point load is a force applied at a single point. As we move across this point from left to right, the shear force diagram shows a sudden, vertical jump. The magnitude of the jump is equal to the magnitude of the concentrated load. An upward force causes an upward jump, and a downward force causes a downward jump.
Step 3: Final Answer:
A sudden increase or decrease in the shear force diagram indicates the presence of a concentrated load at that point.
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