1.2 - 3 Designs and decision making matrix

As we brainstormed together to find the best bridge model, these were the 3 designs we got after a few hours of brainstorming and software simulation:

Design 1 (Simple Truss Model)



Our Simple Truss Model was mostly designed for functionality rather than simplicity. The idea here was to reinforce each joint we can as much as possible so that our bridge can be rather stable and it gives the potential to hold more weight. The bridge definitely gets the job done in terms of holding the vehicle, but it is rather bulky and big.

Design 2 (Howe Model)



The 2nd design here used the Howe Model for its structure. It is relatively stable, with quite less materials used, but over here we can see that there is a lot of stress on only a few points on the bridge. This might mean that the bridge does not exactly spread out the weight evenly, which means it might not be able to hold as much weight. Now, we need to go on and plan for a design that can spread out the weight pretty evenly.

Design 3 (Warren Model)


The 3nd Design here uses the Warren Model for its structure. Even though it is much simpler than the second one, it still can hold the same amount of weight, except that the weight is more evenly spread. It is quite simple, which makes building and designing easier too. 

Decision Making Matrix

After deciding the 3 designs, we went on to put them against a Decision Making Matrix, which will allow us to systematically select the best bridge for us to construct:




And so, we've concluded to use the Howe Model for our bridge.

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