Identify the incorrect statement: The intensity of horizontal shear stress across an elemental strip of a beam section is directly proportional to__________________?
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Answer: D. Moment of the beam section about its neutral axis
Explanation
Horizontal shear stress across an elemental strip depends on the first moment of area. Total section moment is not a proportional factor for elemental shear stress calculations. Shear force and static moment govern the shear stress distribution across beam depths. Shear stress distribution in elastic beams follows a parabolic curve. First moment of area about the neutral axis is represented by the variable Q. Vertical shear force and section width scale the magnitude of the shear stress.
Engineers check shear stress distributions to design web reinforcement in concrete beams. Understanding shear flow prevents horizontal shear failure along glued or cast interfaces. Calculations require accurate geometric properties of the cross-section. Shear force is directly proportional to horizontal shear stress intensity. Area of the section influences the average shear stress across the member. Distance of the centroid from the neutral axis affects the static moment calculation.
- Subject
- Engineering
- Category
- Civil Engineering
- Topic
- —
- Difficulty
- medium
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