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NEES
2012 Earthquake Engineering Workshop
WELCOME!
Stanford
University
State University of
New York, Buffalo
University of New
Hampshire
California State University, Sacramento
NEES
NEES
INTRODUCTIONS
Vandalist Kith Undergraduate Research Assistant
Sacramento StateNelson Tejada Undergraduate Research Assistant
Sacramento StateNathan Canney PhD Student
University of Colorado, Boulder
NEES
Workshop Format
Morning:
Learn earthquake engineering conceptsBuild structures
Afternoon:
Test structuresLearn advanced earthquake engineering concepts
•Interactive group work for most of the activities•Stay involved! Ask lots of questions if you don’t understand!•Be prepared to be asked questions (all engineers are asked tough questions)
2012 Earthquake Engineering Workshop
XXXXXXXXXXXXXXXX
Stanford
University
State University of
New York, Buffalo
University of New
Hampshire
California State University, Sacramento
NEES
Group 1
2012 Earthquake Engineering Workshop
XXXXXXXXXXXXXXXX
Stanford
University
State University of
New York, Buffalo
University of New
Hampshire
California State University, Sacramento
NEES
Group 2
2012 Earthquake Engineering Workshop
XXXXXXXXXXXXXXXX
Stanford
University
State University of
New York, Buffalo
University of New
Hampshire
California State University, Sacramento
NEES
Group 3
2012 Earthquake Engineering Workshop
XXXXXXXXXXXXXXXX
Stanford
University
State University of
New York, Buffalo
University of New
Hampshire
California State University, Sacramento
NEES
Group 4
2012 Earthquake Engineering Workshop
XXXXXXXXXXXXXXXX
Stanford
University
State University of
New York, Buffalo
University of New
Hampshire
California State University, Sacramento
NEES
Group 5
NEESIn your groups:
Find one thing everybody has in common in the group…
Report back in 5 minutes
Group Activity!!
NEESBefore we start shaking our buildings, let’s make sure they can stand up under a load:
Group Activity!!
15 minutes
•Using paper and masking tape, build the strongest structure you can. •The paper structure must be at least 6 inches tall and it will be loaded with books
•Be creative!!
NEESWhy is it important?
We seek to understand what happens to structures during earthquakes
(so we can better design them for the next earthquake)
Earthquake Engineering
Example 1
Example 2
NEESCivil
Geotechnical
Environmental
Structural
Transportation
Water Resources
Earthquake Engineering
Mechanical
Chemical
Electrical
Computer
NEESWe first need to understand the EARTH:Why does the crust move?
25 miles deep
COLD!!!
HOT!!!
Understanding Earthquakes
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Earthquake Locations
???Plate
???Plate
???Plate
???Plate
???Plate
???Plate
Tectonic Plates = “Pieces of the Crust”
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Activity #2:
Name the continental plates on the map
5 minutes!!
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PacificPlate
AntarcticPlate
AmericaPlate
AfricaPlate
EurasiaPlate
AustraliaPlate
6 Continental Plates (14 sub-continental plates)
Tectonic Plates = “Pieces of the Crust”
Earthquake Locations
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1906 San Francisco Earthquake (M=7.9)
Just 1 Magnitude 7.1Earthquake
Earthquakes Can Be Devastating
NEES…Understanding exactly what happens during earthquakes
…Using principles of math and physics to figure out how the shaking affects buildings and bridges
…Using intuition, reasoning, math, and physics skills to design better, earthquake resistant buildings
We try to reduce earthquake damage by…
NEESHow can we protect a building from an earthquake?
Protecting Structures
1. Make it STRONGER2. Make it DEFORMABLE (DUCTILE)3. ISOLATE the building
NEESMake it STRONGER
Protecting Structures
Which structure is stronger? Why?
WoodSmaller members
SteelLarger members
OR
NEESMake it DEFORMABLE (DUCTILE)
Protecting Structures
Which material is more ductile? More brittle?
OR
OR
OR
NEESISOLATE the building
Protecting Structures
Which building would shake less?
Rubberbearings
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Individual Activity
Earthquake engineering concepts1.) STABILITY:Which structure is the worst design (least stable)?
columns
weight
2.) PERIOD OF VIBRATIONWhich structure will shake the fastest?
columns
weight
WHY?Large
weightMost
flexible
WHY?Small
weightLeast
flexible
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Designing K’Nex buildings•1-bay structure•Minimum height: 15”•The base of the structure has to be constructed with either a red or gray rod•Hold specified weight (steel plates) •Fill out the material pricing sheet and calculate how much your structure cost•The base connector must include a free connection point straight down (see figure below)
