Design Project #1 Replacement of Vehicle Bridge over Spring Creek Centre County, PA Introduction to Engineering Design EDGSN 100 Section 002 4 Girls 1.

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Design Project #1 Replacement of Vehicle Bridge over Spring Creek Centre County, PA Introduction to Engineering Design EDGSN 100 Section Girls 1 Guy Design Team 8 Dylan Weyers Julia Minakowski Rebekah Moshier Indira Saifuddin Hyeonji Oh

Statement of Problem A structurally deficient vehicle bridge has collapsed due to extreme flooding. What: Bridge collapse Where: Over Spring Creek on Puddington Road in Centre County, PA Why: Extreme flooding How: Collapse of main pier due to scour of its foundation When: Too soon Who: Design Team 8 Cons of Collapse: ●Was a vital lifeline to Mt. Nittany Medical Center ●Heavy traffic needs rerouted 10 extra miles ●Emergency responders will take longer to reach and react to disasters

Objective To design and replace new vehicle bridge design over Spring Creek due to the extreme flood

Design Criteria ●Standard abutments ●No piers (one span) ●Medium strength concrete (0.23 m) ●No cable anchorages ●Load of AASHTO H20-44 trucks (225kN) ●Bridge deck elevation at 20 meters ●Deck span is 40 meters Howe Truss Bridge ●Carbon Steel ●Carbon Steel Bar ❖ (110x110 mm - 160x160mm) ●Carbon Steel Tube ❖ (120x120x6 mm - 240x240x12 mm) Warren Truss Bridge ●Carbon Steel ●Carbon Steel Bar ❖ (55x55 mm - 170x170mm) ●Carbon Steel Hollow ❖ (100x100x5mm - 140x140x7mm)

Technical ApproachPhase 1: Economic Efficiency Make the cost as low as possible Compression force / Strength, Tension force / Strength as close to 1 as possible

Technical ApproachPhase 2: Structural Efficiency Diagonals didn’t bear as much of the load Middle portion - most flexible Verticles - hollow tubes

ResultsPhase 1: Economic Efficiency Howe : $256, (21 carbon steel bars and 16 carbon steel tubes) Warren : $251, (34 carbon steel bars and 5 carbon steel tubes)

ResultsPhase 2: Structural Efficiency Howe: 201 Average: 335 Warren: 405 Average: 411

Best Solution Economic Efficiency Howe: $256, Warren: $251, Structural Efficiency Howe: 201 Warren: 405 Design Efficiency Howe: $1276/one unit of structural efficiency Warren: $622/one unit of structural efficiency

Conclusions When comparing the two bridges, the Warren bridge proved to be less expensive to build and has a higher structural efficiency than the Howe bridge. Team 8 recommends that the Warren Bridge be built to replace the bridge over Spring Creek.