The Moment of Resistance (MR) in a beam is defined as:
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A.
the internal moment developed due to bending stresses
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B.
the product of shear force and bending moment
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C.
the sum of shear forces in the beam
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D.
the external moment applied to the beam
Correct Answer:
A. the internal moment developed due to bending stresses
Explanation:
The correct answer is the internal moment developed due to bending stresses.
The Moment of Resistance (MR) represents the capacity of a beam's cross-section to withstand bending. When external loads cause a beam to bend, internal longitudinal stresses are generated—compression in one part and tension in another. These internal forces create a coupled moment that balances the externally applied bending moment. Specifically, it is the maximum internal torque a section can provide based on its material properties and geometry before reaching its structural limit. Therefore, the MR is fundamentally the internal response of the beam's fibers to counter external bending effects.
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