Campus Town Pedestrian Bridge
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​Preliminary Foundation Design
Driven Piles
In order to do a preliminary foundation design using driven piles, we used the program Driven. After running the program for every different type of H-pile, we decided that the foundation will most likely have to be drilled shafts. When using the largest H piles, there would only need to be 6 piles on each side. This is a small amount of piles and the instalation cost would just be too high for the mobilization and demobilization of the pile driving equipment.
Drilled Shafts
To perform a preliminary foundation design using driled shafts, we used the program Shaft 5.0. When we ran the program for the campus side, we determined that we would only need one 2 ft diameter drilled shaft that would be 11feet in length. Then we ran the program for the wetland side and determine that we would only need to use one 2ft diameter drilled shaft that would be 9ft in length. Both of these shafs would not have to be extended down to the bedrock as we assummed. The cost of drilled shaft installation is also extremely high. As result, we are going to explore the option of a shallow foundation for our bridge design.
Shallow Foundation
After we utilized an excel spreadsheet for shallow foundations, we determined that a shallow foundation would be adequate for our foundation design. It would also be much cheaper than the deep foundation options. The shallow foundation that we are going to use is a spread footing. it was tested for both the campus and wetland sides and proved to be adequate.
Approach Ramp
Foundation
We determined that we should also use a shallow foundation for the approach ramp. we kept our foundation design uniform to be consistant.