1. Replacement of Vehicle Bridge over Spring Creek
Design Project #1
Replacement of Vehicle Bridge over Spring Creek
Centre County, PA
Introduction to Engineering Design
EDGSN 100 Section 001
BOST Industries
Design Team Number 7
Jared Bunch
CJ Solt
Zachary Timothy
Jerome Orji
Presented to:
Prof. Berezniak
Fall 2016

2. Statement of Problem
Local flooding has destroyed the structurally deficient bridge over Spring Creek
The Spring Creek bridge is heavily traveled and is a vital lifeline to vehicle access to the Mount Nittany Medical Center
The destroyed bridge is disrupting traffic, local commerce, and exposing State college residents to risk as emergency crews cannot respond efficiently
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3. Objective
Pennsylvania Department of Transportation of (PennDOT) Engineering District 2-0 has initiated an emergency, fast-track project to expedite the design of a new vehicle bridge over Spring Creek to replace the bridge destroyed by the recent extreme flood event.
The damaged bridge is blocking the connection to Mount Nitanny Medical Center
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4. Design Criteria Standard Abutments No piers (one span)
Deck material shall be medium strength concrete (.23 meters thick)
No cable anchorages and designed for the load of two AASHTO H20-44 trucks (225kN) with one in each traffic lane
Bridge Deck elevation shall be set at 20 meters
Deck span shall be exactly 40 meters
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5. Technical Approach Phase 1: Economic Efficiency
In Bridge Designer
Equivalent material and size in order to reduce labor costs
Varied the size of individual members based off of their load test results
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6. Technical Approach Phase 2: Structural Efficiency
Bridge Designer
Quenched and tempered steel hollow tubes increased strength
Varied the size of members based of load test results
Arched top cord
Popsicle Stick Bridge
Bridge as perpendicular to the table as possible
Reinforced load bearing members of the bridge
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7. Results Phase 1: Economic Efficiency
Warren Costs: $198,565.63
Howe Costs: $206,065.80
Arched top cord
Quenched and tempered steel hollow tubes
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8. Results Phase 2: Structural Efficiency
Weight
Warren: 87 g
Howe: 73.3 g
Load at Failure
Warren: 82.2 lbs.
Howe: 53.5 lbs.
Structural Efficiency
Warren:
Howe:
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9. Best Solution Structural efficiency:
Howe Bridge (Structural Efficiency):
Warren Bridge (Structural Efficiency):
Economic efficiency:
Howe Bridge (Cost): $206,065.80
Warren Bridge (Cost): $198,565.63
Design efficiency:
Howe Bridge: $622 per unit structural efficiency
Warren Bridge: $463 per unit structural efficiency
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10. Conclusions
Overall, the Warren Truss bridge was both structurally and economically efficient compared to the Howard Truss bridge.
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11. Recommendations
PennDOT should replace the damaged bridge with the Warren Truss bridge.
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