quake-proof power point
TRANSCRIPT
QUAKE-PROOFAPPLYING LAWS OF MOTION TO EARTHQUAKE-PROOF BUILDING DESIGN
DeEtta AndersenScience Teacher and student for lifeCenter Point Urbana High School
OVERVIEW•Build and design structures that withstand horizontal
movements on a shake table•Determine a way to measure the stress on the
building•Re-design and re-test• Present summary of findings and recommendations
THE STANDARDSPICK WHAT FITS YOUR NEEDS• HS PS2-3 Apply scientific and engineering ideas to design, evaluate, ad
refine a device that minimizes the force on a macroscopic object during a collision.• HS-ETS1-3 Evaluate a solution to a complex real-world problem based on
prioritized criteria, and trade-offs that account for a range of constraints, including cost, safety, reliability, and aesthetics, as well as possible social, cultural, and environmental impacts.
INTEGRATION INTO YOUR CURRICULUM
• Introduction activity: Inertia, engineering practices, how to measure forces and motion•Application activity: Laws of motion, Predict acceleration given F and m, momentum.
• I will use the 5E learning cycle for this activity...
ENGAGE•Why do some parts of buildings fall and others stay
standing?
ENGAGE, PART 2• Where is this a concern? • Could this happen to you?!• USGS earthquake map
EXPLORE• Design a 4 story building that withstands the horizontal forces it receives in a seismic event• All structures must have a floor (no spires)•Minimum height: 24 cm•Minimum mass: 45 grams • All floors must have added weight. Can use tape to secure the weight, but not the joints of the building. • Constrain number of toothpicks (25-50) and marshmallows. Styrofoam unlimited.
MATERIALS• Toothpicks• Marshmallows and/or Styrofoam peanuts• Weights, washers, etc.• Ruler, protractor• Shake tables (tray/lid, rubber bands, weights, marbles,
staples)• Spring scales• Tape (secure buildings on shake tables; simulating
footings)• Scales
HOW TO MEASURE BUILDING DAMAGE
• Students can determine this• Tilt from vertical• Amount of bend• Both quantitative and qualitative
data opportunities• They may want to document with
photos
EXPLAIN• Based on your data, what building design
factors influence stability? • How does inertia relate to building stability?
What parts of your building showed the most and least inertia? How do you explain this finding?• Explain the difference between the two shake
tables based on what you know about inertia.• What do professional architects use to reduce
the effects of forces on buildings?
EVALUATE• How are these forces similar and
different to actual seismic waves? • What constraints do engineers
have to work with in retro-fitting older buildings? • What constraints do they work
with in designing new buildings? • What are the costs and benefits
of each type of building material?
I LOVE THE SCIENCE APPLICATIONS OF RETROFITTING BUILDINGS!
Rubber dampers, elevated, decreased surface area
SOMEBODY STOP ME!!!
RESOURCES• They love this shake test of a 30 story model building in China• Rounded architecture video• Great video on retrofit and constraints of engineering• California highway retrofits• Effects on man-made structures• Lots of resources in one site• Exploratorium Engineering for Earthquakes• Don't dislike Wikipedia...best introductory source for this yet!• Lesson plans for other options to test • This reading is excellent and student-friendly. It covers multiple topics.http://www.fema.gov/media-library-data/20130726-1556-20490-0102/fema454_chapter4.pdf• There are so many other resources!