This article was posted 08/03/2006 and is most likely outdated.

An Engineer's Story Problem
 

 
Topic - Unusual and Special Issues
Subject - An Engineer's Story Problem

August 3, 2006  

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An Engineer's Story Problem



A Backhoe weighing 8 tons is on top of a flatbed trailer and heading east on Interstate 70 near Hays, Kansas. The extended shovel arm is made of hardened refined steel and the approaching overpass is made of commercial-grade concrete, reinforced with 1 ½ inch steel rebar spaced at 6 inch intervals in a criss-cross pattern layered at 1 foot vertical spacing.

Solve:  When the shovel arm hits the overpass, how fast do you have to be going to slice the bridge in half?  (Assume no effect for headwind and no braking by the driver...)

Extra Credit: Solve for the time and distance required for the entire rig to come to a complete stop after hitting the overpass at the speed calculated above.  Yes, you can neglect friction...

Demonstrative Solution: (Doesn't look as though he could get up enough speed to make it all the way...)

 

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Comments
  • Mike, believe it or not, this is a common, almost daily event here on Long Island, NY. It is so common that these events make no news reports, no comments, no pictures, but many traffic delays of humongeous proportions. (You may have a preferred alternate spelling of my last adjective).

    Why is this so? Decades ago Long Island was "blessed" with the building of a large system of parkways to facilitate getting to our very nice beaches. In order to keep out the "undesireables" (which was a euphemism for New York City people) from arriving by bus, the many bridges were built very low with clearance only for cars or small trucks. Today, these parkways are all integrated into modern highways and this creates almost an infinite number of ways for large trucks to wander on to the parkways. When they do, a bridge strike is assured every time.

    Our esteemed local government rises to the occassion by doing what?----Of course, put up SIGNS!! That will fix everything. Problem is, they are all in English. Now I ask you: How many truck drivers read English, compadre? Or, how many believe the signs? After all, who would be stupid enough to build low bridges on a main road?

    I have witnessed this carnage for over 60 years. But they are thinking about the problem, so be patient.

    Yes, I am serious. None of this is exagerated.

    kevin cassidy
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