Buildings in Earthquakes: Why do some fall and others don't? (educational)
Ғылым және технология
www.iris.edu/earthquake for more animations
All buildings have a natural, period, or resonance, which is the number of seconds it takes for the building to naturally vibrate back and forth. The ground also has a specific resonant frequency. Hard bedrock has higher frequencies softer sediments. If the period of ground motion matches the natural resonance of a building, it will undergo the largest oscillations possible and suffer the greatest damage.
Dr. Robert Butler (Univ.Portland) gives demonstration of resonance.
Animation & graphics by Jenda Johnson, Earth Sciences Animated
Video demonstration by Dr. Robert Butler, University of Portland
Narrated by NappyT
Guitar solo by Dennis P. McNamara
Science editing by Dr. Robert Lillie (Oregon State University) and John Taber
Пікірлер: 38
Great video! Explanation, graphics, and demo were all very clear. Shared with my family (3 generations) and everyone found it interesting. I love being able to better understand why some types of building are devastated by an earthquake while others remained standing.
@kytddjj
2 жыл бұрын
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Very well made video. Thanks to it, I learned that structures have a natural resonance frequency and how big of a difference it can make.
This video deserves more views.
The explanation has clarified all my doubts...Thanks a ton!!!!
Awesome video - thanks! Bringing this to my commercial construction drawing class.
On the Tacoma's Narrow bridge something called 'Vortex Shedding' added to the problem. I love this video though, so thank you for providing it.
Very clear demonstrations. Thx
I've learned a lot thanks
phenomenal, informative video
God bless you ! Thank you so much the video has been incredibly helpful.
Great video.
Great video & thx.
Very helpful video
Thank you
Super clear thnkss a lot
Very nice video
Excellent
Superb
SUPERB SIR
great great great one.
wow amazing
Who is here watching this video after the earthquakes in Turkey?
GREAT
Thank you!!!!
The most earthquake-resistant house in Japan is a wall-type RC house.
But not much help if it boils down to luck on which building you’re in and what type of earthquake occurs.
Doesn't the frequency & its amplitude change according to the size of the earthquake? Surely that ground & building structure plays a key role in general durability against collapses, but what about the shockwaves? Surely a magnitude & destruction power of say 5.5 and 7.4 earthquakes can't be the same, also depth is another factor.
@mariannamakari9593
Жыл бұрын
They also change according to the types of soil that the wave meets on its way from the epicenter to the structure.
Amazing video, well explained and graphics.. very important to know this, since with all the damages Human Race it's been doing to mother earth 🌍 Earthquakes like those in Turkish it will happening more frequently in the whole word.
Thanks
what would be the equation of resonance?
@danielsmb2635
Жыл бұрын
It is the eigen value of the system; in this case the building system consisting of mass and stiffness…
crest to crest ..period ≤1 sec
ex. Japan 2011 capital e
one wave cycle equals twenty one Hertz
who's here after the Ny Earthquake
I wanna be civil engineer