The bending moment diagram of a simply supported beam carrying uniformly distributed load
over the entire span is-
-
A.
Rectangle
-
B.
Square
-
C.
Right angle triangle
-
D.
Parabola
Correct Answer:
D. Parabola
Explanation:
For a simply supported beam subjected to a uniformly distributed load (UDL) across its entire length, the bending moment at any section is a quadratic function of the distance from the support. Because the mathematical expression for the moment follows a second-degree polynomial equation, the resulting graphical representation in a bending moment diagram is a parabola. The maximum bending moment occurs at the center of the span, where the curve reaches its peak.
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