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Engineering Cohort. London Bridges. Bobbi Peery & Tom Wolfe Mustang Canyon Ridge Rhana Vickers Edmond Sequoyah Katherine Brooks Norman Whittier Jessica Wetherington & Ann Williams PC Kenneth Cooper Dr Chris Ramsmeyer – Mentor. Project Engineers .
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Engineering Cohort London Bridges
Bobbi Peery & Tom Wolfe • Mustang Canyon Ridge • Rhana Vickers • Edmond Sequoyah • Katherine Brooks • Norman Whittier • Jessica Wetherington & Ann Williams • PC Kenneth Cooper • Dr Chris Ramsmeyer – Mentor Project Engineers
Compression - Red Tension - Blue Members can fail many ways
Lateral Torsional Buckling • aka twisting • Joints Bridges can fail many ways
How does increasing the height of a bridge affect the stress on a chord? How does increasing the length of a bridge affect the stress on a chord? Getting down to business
Westpoint Bridge Designer 2014 – Free! Models are most cost efficient
Pasco Model Kit with Sensor • Cleaner data, decrease workmanship error, reusable Models are most cost efficient
Build and test 3 bridges of increasing length. Predict the value of a 4th length Build and test the 4th length Compare predicted and actual value Wood is much more lifelike! The Plan
Getting bridges to fail in the correct place is harder than we originally thought Using equipment correctly in key The real world is not as nice as analytical models Bass wood might look like Balsa wood, but does not break the same Lessons Learned
How to graph in Excel Experimental data can not be altered! All data should go in lab book Lab books should be in pen – may be legal document Lessons Learned
There are over 23,000 bridges in Oklahoma, including 6-7,000 highway bridges • As the length of a bridge increases, the stress (compression, tension) needed to break the bridge decreases • The relationship is power series • As the height of a bridge increases, the stress (compression, tension) needed to break the bridge increases • The relationship is a power series (negative exponent) Information that may come in handy when taking the post test questions