As per IS 800: 2007, which type of beam does NOT need a lateral torsional buckling check?
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A.
Plate girders
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B.
Beams bending about their major axis with λLT more than 0.4
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C.
Hollow rectangular or tubular sections
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D.
I-section beams with a long span
Correct Answer:
C. Hollow rectangular or tubular sections
Explanation:
The correct answer is Hollow rectangular or tubular sections.
According to IS 800: 2007, certain structural shapes are naturally resistant to lateral torsional buckling due to their high torsional stiffness. Hollow rectangular and tubular sections possess significant lateral and torsional rigidity, meaning they typically do not require a lateral torsional buckling check. In contrast, sections like I-beams bending about their major axis or plate girders often necessitate such checks unless they are sufficiently braced, because they are more prone to twisting and lateral displacement under load. Therefore, closed hollow sections are excluded from this requirement under standard design conditions.
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