TrussProject BRAE129

TrussProject BRAE129 - Adam Pescatore Gary Weisenberger...

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Adam Pescatore 5/18/2011 Gary Weisenberger BRAE 129
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Introduction: Design Project “C” involved the design and construction of a bridge from the set of given materials. The completed bridge was tested for strength with the help of the Baldwin testing machine. A few new physics properties were introduced beforehand, and were meant to be used as guidelines for the bridge design. Metal was said to be better at handling tension force while wood was better suited for compression. This means that on the top of the truss bridge, where the structure was going to be compressed, the best material would be wood. On the bottom, the strip of metal would increase the tension force needed to break the bridge. Also, a diagram of a triangle was drawn, and it could be seen that a longer base and a skinnier top would be a stronger design then a skinnier base with a longer top. With these ideas in mind, the materials were put together in the time of two class periods and prepared for the crusher Design Parameters: The materials for this project were one one inch by two inch by fourteen inch block of Clear Redwood , one two inch by fourteen inch twenty gauge galvanized sheet of metal, two six inch zip ties, thirty six inches of nylon baler twine, and four jumbo paper clips. The given materials were to be put together, using as many of the lab tools as required, to withstand as much force as possible. The maximum height of the bridge was set as five and one half inches. The maximum length was twelve inches. The project was allowed to be cut and the material assembled in any way desired. Glue, extra fasteners and other tools were at the disposal of the builder and allowed to be used in reasonable moderation. A vertical load was to be placed on the center of the project, so the desired length of the design was twelve to one fourth inches long. This is a little larger than the amount of space between the loading blocks in the Baldwin testing machine. The purpose of the little extra space was to ensure that the bridge remains balanced as force is applied from the top. As stated before, fasteners were permitted in moderation. Too many fasteners would actually make the wood weaker in the long run. Artistic designs that had no effect on the strength of the truss bridge were welcomed but not required.
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