2.4.1 Structural design and Bridge

ConstructionBy: Maxim Shershenv

P.O.EVAHS

5/20/14

Design BriefClient: VAHS-Mr.Bohem

Target Consumer: Bridge user

Problem Statement: Bridge builders need a sturdy and cheap design for a bridge that will withstand the forces of trucks and cars traveling on it. It must be cheap and reliable.

Design Statement: Design, market, test, and mass produce a fully functioning bridge with minimal cost.

Constraints: -minimal cost -withstands all forces-24ft about lake-no arches-has a flat reinforced concrete deck-10 meters wide

In order to prepare me to design this bridge I looked at a few templates on the program as well as read the introductory information. I also have some previous knowledge with this type of program.

Research summary

This design was cheap and almost withstood the forces of the truck, yet failed to have enough strength in the center.

Brainstorming

More braces were used in this design but it cost too much.Therefore I changed it to have more strength in the middle so that the weight was distributed.

Modification Sketches

This is my final design, I choose it because it worked and was fairly cheap. It does a good job in distributing the weight.

Final Bridge Design

Dennis H. Mahan Memorial BridgeProject ID: 00001A-ExploringIteration #8 (Tue, 20 May 2014, 12:02:12)Iteration #8 (Tue, 20 May 2014, 12:02:12)Type of Cost Item Cost Calculation CostMaterial Cost (M) Carbon Steel Solid Bar (45586.5 kg) x ($4.50 per kg) x (2 Trusses) = $410,278.35

Connection Cost (C) (24 Joints) x (500.0 per joint) x (2 Trusses) = $24,000.00

Product Cost (P) 52 - 140x140 mm Carbon Steel Bar (%s per Product) = $1,000.00

Site Cost (S) Deck Cost (11 4-meter panels) x ($4,700.00 per panel) = $51,700.00Excavation Cost (0 cubic meters) x ($1.00 per cubic meter) = $0.00Abutment Cost (2 standard abutments) x ($5,500.00 per abutment) =

$11,000.00Pier Cost No pier = $0.00Cable Anchorage Cost No anchorages = $0.00

Total Cost M + C + P + S $410,278.35 + $24,000.00 + $1,000.00 + $62,700.00 = $497,978.35

Final Reports cost calculations

Dennis H. Mahan Memorial BridgeProject ID: 00001A-ExploringDesigned By: Maxim Shershnev# Material Type Cross Section Size (mm) Length (m) Compression Force Compression Strength Compression Status Tension ForceTension Strength Tension Status1 CS Solid Bar 140x140 4.00 1325.45 2633.62 OK 0.004655.00 OK2 CS Solid Bar 140x140 4.00 2048.20 2633.62 OK 0.004655.00 OK3 CS Solid Bar 140x140 4.00 2133.40 2633.62 OK 0.004655.00 OK4 CS Solid Bar 140x140 4.00 2154.72 2633.62 OK 0.004655.00 OK5 CS Solid Bar 140x140 4.00 1366.41 2633.62 OK 0.004655.00 OK6 CS Solid Bar 140x140 4.00 1394.29 2633.62 OK 0.004655.00 OK7 CS Solid Bar 140x140 4.00 1377.66 2633.62 OK 0.004655.00 OK8 CS Solid Bar 140x140 4.00 2161.48 2633.62 OK 0.004655.00 OK9 CS Solid Bar 140x140 4.00 2130.11 2633.62 OK 0.004655.00 OK10 CS Solid Bar 140x140 4.00 1881.82 2633.62 OK 0.004655.00 OK11 CS Solid Bar 140x140 4.00 1627.61 2633.62 OK 0.004655.00 OK12 CS Solid Bar 140x140 3.20 0.00 3169.65 OK 2121.754655.00 OK13 CS Solid Bar 140x140 4.47 0.00 2315.16 OK 2110.444655.00 OK14 CS Solid Bar 140x140 4.47 0.00 2315.16 OK 2435.704655.00 OK15 CS Solid Bar 140x140 4.27 0.00 2449.45 OK 2370.354655.00 OK16 CS Solid Bar 140x140 8.38 0.00 712.43 OK 1957.774655.00 OK17 CS Solid Bar 140x140 8.38 0.00 712.43 OK 1966.904655.00 OK18 CS Solid Bar 140x140 4.27 0.00 2449.45 OK 2342.594655.00 OK19 CS Solid Bar 140x140 4.92 0.00 2018.88 OK 2290.814655.00 OK20 CS Solid Bar 140x140 4.30 0.00 2429.80 OK 2326.804655.00 OK21 CS Solid Bar 140x140 2.83 0.00 3407.97 OK 2301.784655.00 OK22 CS Solid Bar 140x140 3.20 899.94 3169.65 OK 0.004655.00 OK23 CS Solid Bar 140x140 4.92 0.00 2018.88 OK 529.324655.00 OK24 CS Solid Bar 140x140 4.92 320.97 2018.88 OK 0.004655.00 OK

Final design load test calculaation

25 CS Solid Bar 140x140 6.80 345.27 1082.12 OK 81.924655.00 OK

26 CS Solid Bar 140x140 6.80 292.53 1082.12 OK 38.164655.00 OK

27 CS Solid Bar 140x140 8.25 357.52 736.00 OK 58.104655.00 OK

28 CS Solid Bar 140x140 8.25 619.09 736.00 OK 0.004655.00 OK

29 CS Solid Bar 140x140 10.69 371.11 438.06 OK 0.004655.00 OK

30 CS Solid Bar 140x140 10.69 401.28 438.06 OK 0.004655.00 OK

31 CS Solid Bar 140x140 8.25 588.22 736.00 OK 0.004655.00 OK

32 CS Solid Bar 140x140 8.25 433.61 736.00 OK 47.134655.00 OK

33 CS Solid Bar 140x140 6.80 281.39 1082.12 OK 93.214655.00 OK

34 CS Solid Bar 140x140 6.80 263.62 1082.12 OK 213.864655.00 OK

35 CS Solid Bar 140x140 5.15 485.13 1877.71 OK 0.004655.00 OK

36 CS Solid Bar 140x140 4.74 382.36 2135.99 OK 62.974655.00 OK

37 CS Solid Bar 140x140 2.83 375.88 3407.97 OK 0.004655.00 OK

38 CS Solid Bar 140x140 10.00 1.91 500.48 OK 172.154655.00 OK

39 CS Solid Bar 140x140 10.00 0.00 500.48 OK 166.144655.00 OK

40 CS Solid Bar 140x140 7.21 899.77 962.46 OK 0.004655.00 OK

41 CS Solid Bar 140x140 7.21 898.27 962.46 OK 0.004655.00 OK

42 CS Solid Bar 140x140 4.47 0.00 2315.16 OK 620.194655.00 OK

43 CS Solid Bar 140x140 4.47 0.00 2315.16 OK 599.044655.00 OK

44 CS Solid Bar 140x140 6.95 448.31 1037.26 OK 0.004655.00 OK

45 CS Solid Bar 140x140 5.15 548.22 1877.71 OK 0.004655.00 OK

46 CS Solid Bar 140x140 5.70 0.00 1539.94 OK 512.204655.00 OK

47 CS Solid Bar 140x140 6.95 446.03 1037.26 OK 0.004655.00 OK

48 CS Solid Bar 140x140 5.15 566.55 1877.71 OK 0.004655.00 OK

49 CS Solid Bar 140x140 5.70 0.00 1539.94 OK 509.684655.00 OK

50 CS Solid Bar 140x140 4.74 0.00 2135.99 OK 475.134655.00 OK

51 CS Solid Bar 140x140 4.74 0.00 2135.99 OK 443.784655.00 OK

52 CS Solid Bar 140x140 7.00 0.00 1021.39 OK 254.474655.00 OK

Continued load test results

Member property

I used the regular carbon-steel solid bar truss so that it would be cheaper and yet still strong. The truss configuration was resembling a arch bridge that was turned upside-down.

Final Design Justification

-Mr.Boehm-West Point Bridge Designer Templates-Previous Knowledge

References

How does the type and direction of stress applied affect the selection of the material type and the cross-sectional area?-If stress is applied downward then it is good to use a stronger metal of it is connection pieces a weaker metal can be used.

Conclusion

How can the forces of compression and tension work together to make a stronger bridge?- By using a design that has both compression and tension factors incorporated into it, the designer will be able to distribute the weight of the load and therefore increase efficiently and lower cost by using the optimal material for the relating force.

Conclusion