ENG1001-Assignment-1.docx

40 assumptions in the design phase we assumed that

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4.0 Assumptions In the design phase, we assumed that the our bridges designs approximately met the design specifications, however the final design was to be refined to meet the specifications and further analysed once chosen. We also initially assumed that each design was determinant and that all reactions could be calculated. 5.0 Build 5.1 Design 1: This was our initial truss design. At first we believed it to be simple in design and easy to build. However, upon closer inspection we realised it to be impractical as it was essentially just a diagonal beam. Meaning it would not be suitable under heavy loads due to the way it would quickly bend, resulting in high compression and tension on the top and bottom of the bridge. Furthermore, the calculations for this design were also difficult as it was hard to determine how the weight would be distributed from the base plate down through the members 5.2 Design 2: 1
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ENG1001 Report- Bridge$ Our second design was created to easily overcome the 200mm rise in the specifications, by simply placing two struts at the base of the left side. This design was more suitable than the previous as the calculations were much more straightforward, thus working out the member forces was easy. However, it still posed the same flaw as the previous design in that it was just one long beam. Implying that it would easily bend due to there being no supporting struts, allowing for the base plate to have more of a torque as the length is of a significant value. This concept is comparable to a longer piece of spaghetti requiring less force to break in half than a shorter piece. 5.3 Design 3: 2
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ENG1001 Report- Bridge$ The final design addressed all the issues faced in the previous designs. It was easy to calculate the member forces and it also eliminated the singular long beam problem. It instead used 3 main sections strutted together to form a rigid structure that could support heavy loads. 6.0 Analysis The load was applied to the bridge in a central location according to the length of the bridge. The design used in this test allowed the loading plate to be placed centrally over 4 joints as the trusses perform best when they are loaded at these points. The load in each member was calculated using the sum of the failure weight that was found during earlier tests as the load acting on the truss and its self weight. This applied load was assumed to be evenly distributed over the 4 joints, therefore, each joint had a load of a quarter of the entire load. The self weight of the load was treated as a uniformly distributed load and was calculate as a central point load. A method of joints analysis of the bridge was performed to calculate the force in every member and to locate the members with the highest tension and buckling forces being applied to them. To confirm that the calculations in the method of joints analysis were true, the method of sections analysis was used.
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