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Bridge Project

Bridge Project

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Bridge Project

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  1. Bridge Project Dan Nowak & Katie Ellinger

  2. Specifically, what part of your bridge broke?  Why do you think it broke there? BE SPECIFIC.  How could this breaking area have been reinforced (and don’t just answer by adding glue or supports…EXPLAIN where extra support needed added!)? • Our bridge first broke on the left rear side, to the right of the corner gusset. It broke there because our bridge was so ridged and was not set square on the blocks like it was planned to be. We could have made sure that our bridge was set flat on the blocks and we could of added more reinforcement to our main braces. Bridge break

  3. Describe the types of stresses in your bridge as you tested it.  If you don’t remember the types of stress, refer back to the Bridge Background Wikis created by your class.  How could you tell either by viewing the testing or by viewing the video that your bridge was undergoing these stresses (and yes, you should have more than one!)? • In the video you can see that our main supports went through tension or the pulling apart of the piece, when it was originally designed to go under compression. We also had torsion because our bridge twisted when it broke. The reason it did this was because our bridge wasn’t set flat on the testing blocks.

  4. Describe the transformation of your original bridge design as you built. What was added, eliminated, or altered from your original design?  EXPLAIN why you made those changes. Where did you add gussets? How did you laterally brace the two sided of the bridge together? • We added larger gusset and made the beams that we felt would bear the most of the load thicker to compensate. We added the gussets to the main joints to keep them from breaking under the pressure. • We laterally braced by just gluing strips to connect the two trusses. These only failed when our bridge twisted.

  5. As you witness other group’s bridges being tested, consider the following questions: Did a majority of the bridge designs have the same weaknesses?  Was there a pattern of the bridges breaking in the same general areas?  Explain what weakness or areas of failure some of the bridges had in common. • Yes they all broke at the point next to the testing block. • Yes the right angle at that point usually failed first on most of the bridges. We made sure that we reinforced this point on our bridge.

  6. In your opinion, what about its structure made the bridge with the highest efficiency in your class most efficient?  What design feature did it contain that yours did not, or how did they modify this feature to be more effective?  If you ARE the most efficient, describe the feature that made yours the most efficient compared to the other bridges in your class. • The fact that it was an arch made it stronger with tension. Matt and Brooke also added more than one piece of balsa wood to each arch to give it more strength. Ours didn’t contain an arch at all. We also only had two pieces of balsa wood glued together while they had many more.

  7. Provide at least two “ tips” that you think would help others who had to build a great balsa bridge • Gussets, gussets, gussets! Make sure almost all joints and connections are reinforced. • Make sure that your design uses the testing blocks to your advantage like we attempted to do.