Author2022 TCNJ Steel Bridge Team |
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Final Bridge Design10/25/2021 Upon reviewing the alternative designs put forth by each member, it was determined that Alternative Design 1 had the best score on the decision matrix and would therefore be used as the basis for our final design. Weights were given to each design criteria based on how important the team thought they would be. Some changes have been made to Alternative Design 1 to improve its performance. The total height of the design was increased by 2 inches, with further angled supports being added connecting to the footings. 2.5 foot lateral supports were added between stringers. The footing sizes were increased to 3in X 3in to increase stability. Thickness of members were changed to either decrease weight or decrease sway and deflection. Currently, the bridge weights an approximate 232lbs.
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Alternative Designs10/19/2021 Alternative designs were modeled using visual analysis. Five alternative truss designs were analyzed. The alternative designs had to be certain dimensions according to the competition rules. The rectangular pipe shape was assumed to be the same for all truss designs as well as the connections. The loading was applied to each truss design. The alternatives are shown below. Alternative Design 1 Alternative Design 2 Alternative Design 3 Alternative Design 4 Alternative Design 5 Design analysis was completed for all alternative designs. The main considerations included the number of members, number of connections, estimated weight, highest member force, and deflection. The design analysis can be seen below.
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