Which failure mode is accelerated when inadequately supported steel beams experience prolonged vibration near resonant frequency?

💡 Explanation

When steel beams vibrate near resonant frequency without proper support, enhanced cyclic stress and strain induce cumulative microscopic damage via fatigue crack propagation, leading to eventual catastrophic failure. Therefore fatigue crack growth accelerates, rather than plastic deformation, oxidation or fracture that demand higher stress thresholds/unique environmental factors.

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