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Mosaic Minutes

CTC II Summary 2/4/2013

2/9/2013

 

Bridges and Buildings

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How do you design a paper bridge that can span eight inches and support a load of 100 pennies, given one sheet of 8.5 x 11 copy paper and a few paper clips?

That was the challenge students were given to ponder for homework last week.  This week students were asked to build their bridge in class and then we examined each design and tested the paper bridges to see how much load they could bear.
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Charles Besjak, Director of Structural Engineering at Skidmore, Owings & Merrill NYC (www.som.com) was our guest consultant and engineering expert.  Mr. Besjak provided students with an overview of some basic engineering principles including the importance of how materials in bending work together in compression and tension to resist force.  A significant principle in bridge design, whether paper, concrete, or steel, is to make sure that all components act in a monolithic way (in unison) to resist the applied loads (whether pennies or cars!).

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Students tested their paper bridge designs by loading them with pennies and counting how many could be supported before collapse.  The students came up with an interesting range of designs - including net-like structures, tunnels and tubes, and accordion folds - several of which held as many as 200 pennies!  Mr. Besjak discussed the pros and cons of each design, and illustrated several approaches for folding the paper (for strength) while making sure to connect the elements into a monolithic (single) structure. 
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For our final building activity, students broke into three groups and were challenged to create a structure as tall as possible in 10 minutes, using only two sheets of newspaper and some masking tape.  Here are the results of how well they coupled the structural principles they had just learned with their own creativity and imagination!
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And so concludes our semester of Creative Thinking!  It has been a pleasure sharing this time with all of you and I look forward to continuing our journey of learning together.

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