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Balsa Wood Bridge Design

Balsa Wood Bridge Design. Group AAA Jim Bowen. Group AAA Division of Labor. Jim Bowen did all the work Bridge design, construction, testing Matlab program development Oral and written presentation writing. Group AAA - Bridge Design and Testing Methods.

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Balsa Wood Bridge Design

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  1. Balsa Wood BridgeDesign Group AAA Jim Bowen

  2. Group AAA Division of Labor • Jim Bowen did all the work • Bridge design, construction, testing • Matlab program development • Oral and written presentation writing

  3. Group AAA - Bridge Design and Testing Methods • Started with the simplest 5 node trapezoidal truss • tried different member sizes and top node spacing to see how mass and strength varied • tested some 5 node trusses that used .25” x .25” members • chose .25” x .50” as member size, 14” spacing • wrote a Matlab script to see how height affected mass, strength, and profit (see figure)

  4. Bridge Design Testing

  5. Group AAA - Bridge Information • Bridge dimensions • 24.5” long, 8.5” high, 4.0” wide • Bridge “numbers” • 10 nodes (5 per truss) • 14 members • 1 member type (.25” x .50”) • Truss configuration • Warren through truss (see figure)

  6. Truss Design - Group AAA

  7. More Bridge Information • Estimates from Matlab program • Mass = 69 grams • Strength = 111 lb • Cost = 26.5 million $ • Benefit = 29.0 million $ • Profit = 2.5 million $ • Special features of group’s work • used Matlab program to test many different candidate designs Questions?

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