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← TechnologyWhich outcome occurs when torsional load on long I-beams supporting a heavy bridge deck exceeds the critical threshold?
A)Lateral torsional buckling initiates rapidly✓
B)Web crippling causes concentrated stress
C)Shear stress evenly distributes locally
D)Flange deformation is completely inhibited
💡 Explanation
Lateral torsional buckling arises because exceeding the beam's torsional capacity introduces instability, causing sudden sideways displacement. Therefore, buckling happens rapidly rather than exhibiting even shear stress or fully inhibited flange deformation as the load concentrates at weak points.
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