83 design 3 proved fruitful in terms of success of

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deflection resulting in the bridge’s failure. 8.3 Design 3 proved fruitful in terms of success of the bridge. Tackling all the issues that arise in the previous designs, design 3 proved to be strong and light, maximising the strength to weight ratio. With double and triple strands placed only where they were needed. This was achieved by completing the method of joints and method of sections (refer to Appendix 3&4). The approach taken for the design was done such that the faces of the trusses were all constructed of the same length, proving for easier construction. The predicted outcome compared to the actual outcome had a strong correlation, deeming the discrepancies from the measurement of the spaghetti members dismissible. With an error of +- 0.30mm measurement from the callipers, as well as the measurement of the strength of the members, since human accuracy only be accurate to a small degree. Further, when calculating forces within the truss bridge, it was assumed the load was equally applied on the joints of the section the loading plate rested on, when in reality it was a uniformly distributed load. But due to insufficient resources it was assumed otherwise. For future reference tools for measurement should be accurate to a higher degree as well as scales for weight and force measurement, which will help to further minimise the errors in calculations. 5
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ENG1001 Report- Bridge$ 9.0 Conclusion In the report, the design for the spaghetti bridge has been justified and though to be the most optimal design. The key requirements being it must span 800mm, sit on a 200mm block on one end and support at least 1200g. Through calculations and testing, it was found that design three proved superior of the designs mentioned. With its simple design for easy construction, determinacy for calculation and relatively light weight to help maximise strength to weight ratio. 10.0 Personal contribution 10.1 Callum Poke (ID: 28815017) - This project has presented me with an opportunity to develop my knowledge of the basic principles related to trusses and calculating their loads using the three equations of equilibrium in a practical manner and of the structuring of group work in university. In this project I contributed strongly towards the process that our bridge analysis and build was taking by ensuring that we maintained an appropriate timeline of events to ensure that we would complete it on time. In the report stage of the project I was responsible for the analysis and design components which was inclusive of the calculations of the forces in each member with the applied load and calculating the safety factor of the members in the highest tension and compression. 10.2 Galina Enright (ID: 28806557)- Throughout the project our group evenly shared the tasks. In the first weeks of pracs, we rotated who did the calculations (including means and standard deviations), who scribed, who actually did the experiments and who ensured these all worked. Overall I was pretty spread with what tasks I did. In terms of design of the bridge, I contributed to the final design by suggesting the shape of two diagonals allowing the bridge to span upwards. During construction, I
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  • Fall '15
  • English, Truss, Truss bridge, ENG1001 Report- Bridge

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