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What is the primary cause of positive bending moment in a simply supported beam?
13. What is the primary cause of positive bending moment in a simply supported beam?
- Internally shear forces
- Externally applied loads
- Distributed axial loads
- Torsional moments
Answer
The correct answer is: B) Externally applied loads
Explanation
When the beam bends concavely upward due to externally applied stresses, there is a positive bending moment. The distribution of forces throughout the beam's length results in this bending moment.