Which consequence results when sustained high-frequency vibration excites a steel I-beam near a resonant frequency?

💡 Explanation

Fatigue cracking occurs because dynamic stresses amplify near resonance, exceeding the material's fatigue limit through cyclic fatigue crack propagation, therefore accelerating failure, rather than stabilizing through stress redistribution or increased damping, which would require additional design elements.

• In welded steel bridges, which risk dramatically increases when residual stresses aren't relieved via annealing?
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