Last week we were able to test our bridge. The bridge was able to hold 30 pounds of sand and it cost $243K. Even that our bridge was not the best I think that we got a good ratio in weight/price. We are trying to find out our weakest point of the bridge so we can make it stronger. The main problem I think we had was that our length was exactly 2 feet and probably it should have been a little bit more so it would be more stable while testing it. We have to make the bridge 3 feet long for the final test so we are working on that. Based on the design of the bridge which is symmetrical I think that our bridge is still going to have a good ratio even after we make it longer.
For the Knex pieces I would like to know the tension force of each one of them. WPBD software tells me the tension of each piece so I am able to see where the bridge needs improvement. If I would know the tension forces for the Knex pieces I would play around with them to make the bridge cheaper and stronger since we already know the price of each piece. I guess by testing all of the pieces with how much weight they can hold before breaking like we do with the bridge, we can find out their tension force.
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