Introduction to Engineering Design

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Presentation transcript:

Introduction to Engineering Design Design Project #1 Replacement of Vehicle Bridge over Spring Creek Centre County, PA Introduction to Engineering Design EDGSN 100 Section 002 4 Girls 1 Guy Design Team 8 Dylan Weyers Julia Minakowski Rebekah Moshier Indira Saifuddin Hyeonji Oh

Statement of Problem 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 Statement of Problem A structurally deficient vehicle bridge has collapsed due to extreme flooding. 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 Howe Truss Bridge Carbon Steel Carbon Steel Bar (110x110 mm - 160x160mm) Carbon Steel Tube (120x120x6 mm - 240x240x12 mm) 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 Warren Truss Bridge Carbon Steel Carbon Steel Bar (55x55 mm - 170x170mm) Carbon Steel Hollow (100x100x5mm - 140x140x7mm)

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

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

Results Phase 1: Economic Efficiency Howe : $256,465.20 (21 carbon steel bars and 16 carbon steel tubes) Warren : $251,890.30 (34 carbon steel bars and 5 carbon steel tubes)

Results Phase 2: Structural Efficiency Howe: 201 Average: 335 Warren: 405 Average: 411

Best Solution Economic Efficiency •Howe: $256,465.20 •Warren: $251,890.30 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.