BISOPE series 77- Bridges and Vibration ------------------------------

If you have taken a basic class on vibration, you may have seen the video of the collapse of the ‘Tacoma Bridge’ as an example of an accident related to the damage. It may be the biggest example of an accident, and since fatigue failure accounts for a large proportion of vibration, we want to hide it, but the collapse of Seongsu Bridge can be said to be a similar example. Bridges are huge structures, and they clearly have their own natural frequencies, so they can definitely collapse. If only the excitation source that causes resonance is properly given…

 Beginning related to bridges and vibration

 

The natural vibration frequency of a typical bridge is around 1~3Hz, and this characteristic varies depending on the overall length of the bridge, the type (cable-stayed bridge, suspension bridge, general bridge), the length of the pier, the cross-section or material of the deck, etc., but if this characteristic is touched, such as the Tacoma Bridge, it shows a large reaction (resonance). Damage refers to the loss of girders, destruction of piers, and subsidence of foundations.

 In these loads, if we look at the vibration caused by wind loads in more detail, it takes the form of torsional, vortex shedding, buffeting, galloping, and flutter.

Key! Bridge, Tacoma Bridge, vibration, TMD, base isolation, earthquake

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