I can’t sit still….I got the hippy hippy shakes!.
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Transcript of I can’t sit still….I got the hippy hippy shakes!.
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Earthquake Engineering
I can’t sit still….I got the hippy hippy shakes!
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Earthquake Engineering
Earthquakes are damaging!
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Earthquake engineering
Engineers have been designing materials and structures that can better withstand earthquakes!
They put their designs to the test on shake tables.
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What we know so far!
There are several rules that we use when building our cities and homes to withstand earthquakes.
A lot of this research is done where earthquakes are common. Japan California
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Rule #1 = Lower the Center of Gravity!
Putting weight near the bottom of a tall object makes it harder to push over!
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Lots of things need to not tip over.
BUOYS!!!
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Gotta have that Super-Base!
Mass at the bottom is the best way to ensure a strong foundation!
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Lock it down with Anchors
Deep foundations and pilings anchor the buildings to the ground!
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Rule #2 – Motion is a good thing!
…maybe a little too much
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Let em’ swing!
If a building cannot sway slightly, it may snap like a brittle twig.
Swaying allows the building to ABSORB energy!
Concrete crumbles…
Steel is the best thing for this!
Swaying buildings in Japan!
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Braces – Make it strong
http://www.youtube.com/watch?v=o1mPXOi5thk&noredirect=1
What is the strongest structural shape??
TRIANGLES
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Dampers!
It works in a bridge too!?
Model without damper
Model with damper!
Taipei 101 (the tallest building in the world)
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Taipei 101 – Tuned Mass Damper (TMD)
Action during an earthquake!
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Base Isolation - Put something between the building and the ground!
Museum shake table http://www.youtube.com/watch?feature=player_detailpage&v=FTb9Mbx0DwQ
Elastic Bearing http://www.youtube.com/watch?v=p
hgdkqn9aTI (1 min)