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← ScienceWhich consequence results when a bridge oscillates excessively?
A)Resonant amplification increases load fatigue✓
B)Material density decreases abruptly
C)Shear stress spontaneously reverses direction
D)Cable tension stabilizes structural nodes
💡 Explanation
Resonant frequency induces constructive interference, amplifying vibrations beyond material yield stress, because mechanical resonance causes the vibrational amplitude rise with each excitation cycle, therefore leading to resonance amplification and fatigue, rather than the structure density decreasing.
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