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
CARV Designers
Team 2
Varshini Chellapilla
Alexis Pritchard
Cameron Wilson
Rafael Saavedra
Insert Your Bridge Photo here
Insert Your Design Team Photo here
Presented to:
Prof. Berezniak
Fall 2016

2. Statement of Problem
Bridge located over Spring Creek on Puddintown Road destroyed due to local flooding.
Bridge failure due to collapse of main pier by erosion from fast moving flood water
Disturbance to residential traffic flow, local commerce and access to Mount Nittany Medical Center. Residents remain at considerable risk.
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3. Objective
Pennsylvania Department of Transportation of (PennDOT) Engineering District 2-0
Fast track project to design a new bridge over Spring Creek
Under $250,000
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4. Design Criteria Through-type steel truss bridge Single span, no piers
Bridge must be Warren or Howe
Standard abutments
Deck material shall be medium strength concrete (0.23 meters thick)
Bridge deck elevation = 20 meters | Deck span = 40 meters
Steel member type, steel cross section type, and steel member size is upto Design Team.
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5. Technical Approach Phase 1: Economic Efficiency
-Price: under 250,000 $
-Both of the bridges respected the budget given.
Warren Bridge with a cost of 248,799$
Both bridges used hollow carbon steel tubes in order to be within the budget range.
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Howe Bridge with a cost of 249,038$ 5

6. Technical Approach Phase 2: Structural Efficiency
Both the Warren Bridge and the Howe Bridge used hollow carbon steel tubes. They were within the budget and had the structural capacity to hold up a live load (the truck.) They were also capable of holding up their own dead load. 
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7. Results Phase 1: Economic Efficiency
We had to find a way to utilize every popsicle/member to it's full potential
We did so by starting our framework at bare minimum and evenly distributing the popsicle sticks until they were all completely even
Strength
Point of critical failure
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Span of the bridge
Strength
Point of critical failure 7
Span of the bridge

8. Results Phase 2: Structural Efficiency
In order to minimize the cost, we had to maximize the function of each member/popsicle stick 
Avoided gluing multiple popsicles directly adjacent with one another, as we realized the strength would more likely be needed in the joints  
In an effort to strengthen the joints, we interlocked most of the popsicles on the joints, where we felt they would be the weakest
The fault lied in the joints in the Howe Truss Bridge- The members were not glued as correctly, and the width of the bridge on one side was not held constant throughout the top and bottom chord
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9. Best Solution Technical Approach:
     -The best bridge to use would be the Warren Bridge
          -support the load test
          -cheaper
          -more structural efficient 
Results:
     -The best bridge to use would be the Warren Bridge
         -held more weight
         -both used same amount of materials, but the Warren Bridge used  them more efficiently 
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10. Conclusions
Warren Bridges are more cost efficient and can hold more weight when given the same amount of materials 
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11. Recommendations
-When designing the bridges in the experimental phase, use a better glue, that way glue will not play a factor in the bridge's structural integrity 
-Also, collaborating with other teams could have allowed for a better overall design because when engineers work together, that
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