Bridge Contest Sample Presentation

1
Bridge Contest Sample Presentation

• Essential Presentation Elements
• Group Name, Member Names
• Groups Division of Labor
• Numbers Needed to Calculate Cost
• Type of Truss
• Truss Figure
• Estimated Mass, Cost, Strength
• Any special features of bridge design
• Presentation Time 2 - 4 minutes (5 - 8 slides)
• An example presentation follows this slide

2
Balsa Wood BridgeDesign

• Group AAA
• Jim Bowen

3
Group AAA Division of Labor

• Jim Bowen did all the work
• Bridge design using TrussAnalyzer,
• Bridge construction
• Bridge testing
• Oral presentation

4
Group AAA - Bridge Information

• Bridge dimensions
• 24.5 long, 8.5 high, 4.0 wide
• Bridge numbers
• 10 nodes in bridge (5 per truss)
• 1 member type (.25 x .50)
• 0 of 1/8x1/8 wood
• 245 of 1/4x1/4 wood
• Truss configuration
• Warren through truss (see figure)

5
Truss Design - Group AAA
6
More Bridge Information

• Estimates from TrussAnalyzer spreadsheet
• Mass 69 grams
• Strength 111 lb
• Cost 26.5 million
• Benefit 29.0 million
• Profit 2.5 million
• Special features of groups work
• Tested many different candidate truss designs
  using TrussAnalyzer spreadsheet
• Tried many different height and node positions
• Built 2 bridges (1st for testing, 2d for contest)

Questions?