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Bridge Project: Team Truss-Arch

Bridge Project: Team Truss-Arch. By Laila Dingwall, Casey Byers, Katie Glore, and Kyle Fowler. Outline. Introduction Prototype Construction Testing Final Design Construction Testing Evaluation and Conclusion. Efficient Meet Constraints. Goals. 8in. 19in. 2.5in. 16in.

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Bridge Project: Team Truss-Arch

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  1. Bridge Project: Team Truss-Arch By Laila Dingwall, Casey Byers, Katie Glore, and Kyle Fowler

  2. Outline • Introduction • Prototype • Construction • Testing • Final Design • Construction • Testing • Evaluation and Conclusion

  3. Efficient Meet Constraints Goals 8in 19in 2.5in 16in

  4. Prototype Testing Component Analysis

  5. Component: Compression • Keep depressors short for more strength • Longer members fail under less weight • Make sure to pick stronger depressors from box when selecting

  6. Prototype Testing Prototype Analysis

  7. Research • The design of the arch of the Fremont Bridge (Portland, OR) inspired the design of the top and bottom arches • From various truss structures it was noticed that all utilize triangles. • This knowledge helped in the connecting of the arches together Construction of the Fremont Bridge, 1973 Above photo courtesy of the Office of Auditor, City of Portland

  8. Designs Solid Arch Arch with String Support Truss Arch

  9. Design Pros and Cons

  10. Final Design

  11. Prototype Testing Prototype Performance

  12. Testing Process Prototype Weight: 0.712 lbs Anticipated Load: 100 lbs Prototype Maximum Load: 165 lbs Prototype Efficiency: 232

  13. Why the Prototype Failed • Notice how the bridge is not squarely on the jig • This caused it to slip off

  14. Final Design

  15. Design Sheet

  16. VS 137% Increase

  17. Failure Points

  18. Conclusion

  19. Conclusion • Arch bridge used to distribute the weight to the ends of bridge and to the jig. • Diamonds were used on the top of bridge was used to push pressure to the arches. • Internal X structure used to keep it from collapsing at the point of pressure. • Precise measurements were made to see that the bridge was built to fit perfectly into the jig.

  20. Conclusion • Bridge failed both times on the ends and started to buckle at the diagonal connectors. • Shorter sticks could have been used for the connectors. • Glue other then the hot glue could have been used for joint strength. (Time was the reason for initial use.) • More reinforcements to keep the arches from bending.

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