The 1940 Tacoma Narrows Bridge, the first Tacoma Narrows Bridge, was a suspension bridge in the U.S. the Tacoma Narrows Bridge that broke apart during normal wind conditions ....
In general, resonance is a condition in which an object or system is subjected to an oscillating force having a frequency close to its own natural frequency. This cause the vibration in the structures (bridge) to grow progressively larger than the ground vibration, rather than dying away due to the natural damping in the structure. Thus, even low velocity components of a vibration which occur repeatedly or continuously at the resonant frequency, are potentially dangerous to the structure.
I suggest you to watch this short clip:
https://www.youtube.com/watch?v=b7MFWf3tdso
It explains it by physics concepts
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