What phenomenon occurs due to shear strains modifying the bending stresses in the flange and causes sections to warp?
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A.
Local buckling
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B.
Web Scraping
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C.
Torsional instability
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D.
Shear lag
Correct Answer:
D. Shear lag
Explanation:
The correct answer is Shear lag.
Shear lag is a structural phenomenon where shear strains cause the longitudinal stresses in the flange of a beam to be distributed non-uniformly. In wide-flange beams or box girders, the parts of the flange further away from the web do not carry the full bending stress, causing the cross-section to warp. This effect modifies the standard bending stress calculations and is particularly significant in thin-walled structures and wide flanges where the assumption that plane sections remain plane no longer holds true. Overlooking shear lag can lead to an underestimation of stresses near the web-flange junction.
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