1. 2.4.1 Structural design and Bridge Construction
By: Maxim Shershenv
P.O.E
VAHS
5/20/14

2. Design Brief Client: 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

3. Research summary
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.

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

5. Modification Sketches
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.

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

7. Final Reports cost calculations
Dennis H. Mahan Memorial Bridge
Project ID: 00001A-Exploring
Iteration #8 (Tue, 20 May 2014, 12:02:12)
Type of Cost Item Cost Calculation Cost
Material Cost (M) Carbon Steel Solid Bar ( 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) x140 mm Carbon Steel Bar (%s per Product) = $1,000.00
Site Cost (S) Deck Cost (11 4-meter panels) x ($4, per panel) = $51,700.00
Excavation Cost (0 cubic meters) x ($1.00 per cubic meter) = $0.00
Abutment Cost (2 standard abutments) x ($5, per abutment) = $11,000.00
Pier Cost No pier = $0.00
Cable Anchorage Cost No anchorages = $0.00
Total Cost M + C + P + S $410, $24, $1, $62, = $497,978.35

8. Final design load test calculaation
Dennis H. Mahan Memorial Bridge
Project ID: 00001A-Exploring
Designed By: Maxim Shershnev
# Material Type Cross Section Size (mm) Length (m) Compression Force Compression Strength Compression Status Tension Force Tension Strength Tension Status
1 CS Solid Bar 140x OK OK
2 CS Solid Bar 140x OK OK
3 CS Solid Bar 140x OK OK
4 CS Solid Bar 140x OK OK
5 CS Solid Bar 140x OK OK
6 CS Solid Bar 140x OK OK
7 CS Solid Bar 140x OK OK
8 CS Solid Bar 140x OK OK
9 CS Solid Bar 140x OK OK
10 CS Solid Bar 140x OK OK
11 CS Solid Bar 140x OK OK
12 CS Solid Bar 140x OK OK
13 CS Solid Bar 140x OK OK
14 CS Solid Bar 140x OK OK
15 CS Solid Bar 140x OK OK
16 CS Solid Bar 140x OK OK
17 CS Solid Bar 140x OK OK
18 CS Solid Bar 140x OK OK
19 CS Solid Bar 140x OK OK
20 CS Solid Bar 140x OK OK
21 CS Solid Bar 140x OK OK
22 CS Solid Bar 140x OK OK
23 CS Solid Bar 140x OK OK
24 CS Solid Bar 140x OK OK

9. Continued load test results
25 CS Solid Bar 140x OK OK
26 CS Solid Bar 140x OK OK
27 CS Solid Bar 140x OK OK
28 CS Solid Bar 140x OK OK
29 CS Solid Bar 140x OK OK
30 CS Solid Bar 140x OK OK
31 CS Solid Bar 140x OK OK
32 CS Solid Bar 140x OK OK
33 CS Solid Bar 140x OK OK
34 CS Solid Bar 140x OK OK
35 CS Solid Bar 140x OK OK
36 CS Solid Bar 140x OK OK
37 CS Solid Bar 140x OK OK
38 CS Solid Bar 140x OK OK
39 CS Solid Bar 140x OK OK
40 CS Solid Bar 140x OK OK
41 CS Solid Bar 140x OK OK
42 CS Solid Bar 140x OK OK
43 CS Solid Bar 140x OK OK
44 CS Solid Bar 140x OK OK
45 CS Solid Bar 140x OK OK
46 CS Solid Bar 140x OK OK
47 CS Solid Bar 140x OK OK
48 CS Solid Bar 140x OK OK
49 CS Solid Bar 140x OK OK
50 CS Solid Bar 140x OK OK
51 CS Solid Bar 140x OK OK
52 CS Solid Bar 140x OK OK

10. Member property

11. Final Design Justification
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.

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

13. Conclusion
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.

14. 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.