BISOPE series 93- Is an earthquake a vibration?----------------------------------------------------------------------------------------------------

When the ground shakes, most people feel very anxious. You can cover your ears for loud noises, but it’s very scary to see a ride with a moving floor. If you think of that anxiety as a thrill, it’s okay… But this is also an experience~ You get used to it after a while. I experienced an earthquake in Japan once, and I didn’t know what to do, but I remember them being more calm than I thought. Is an earthquake a vibration?

As you said, people who walk upright feel very threatened when the ground is unstable. Since Japan, where earthquakes occur frequently, is nearby, there was some radio wave learning, but since there are relatively few earthquakes, we let our guard down. If only the ground in the playground were to move, there would be no problem, but if the ground were to crack, a tsunami would hit, or a building would collapse, causing more casualties, that would be the threat of an earthquake..

 

Keywords: #Earthquake, #Hz, #Scale, #Intensity, #BuildingVibration, #VibrationConsulting, #ProductVibration, #VibrationEvaluation, #VibrationMonitoring

#vibration education, #frequency analysis, #resonance measurement#vibration measuring instrument, #frequency setting, #Fmax, #maximum frequency, #sampling frequency, #sampling rate, #FFT, #3-axis vibration sensor, #acceleration sensor, #vibration education, #building vibration, #vibration measurement, #resonance analysis, #resonance measurement, #vibration monitoring, #vibration noise consulting  www.kCBM.kr,   https://blog.naver.com/vs72 , https://contents.premium.naver.com/bisope/visope

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

#vibration measuring instrument, #frequency setting, #Fmax, #maximum frequency, #sampling frequency, #sampling rate, #FFT, #3-axis vibration sensor, #acceleration sensor, #vibration education, #building vibration, #vibration measurement, #resonance analysis, #resonance measurement, #vibration monitoring, #vibration noise consulting  www.kCBM.kr,   https://blog.naver.com/vs72 , https://contents.premium.naver.com/bisope/visope