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CE 301 Balsa Wood Bridge Andrew Brownlow, Jamison Crowley, Johnson Baker, Chris Schultz

Critical thinking

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Page 1: Critical thinking

CE 301Balsa Wood Bridge

Andrew Brownlow, Jamison Crowley, Johnson Baker, Chris Schultz

Page 2: Critical thinking

Bridge Design

Original Design

Truss

Deck with Girders

Cross Bracing

Final Design

Simple Girder Design

Two Main Girders

Cross Bracing

Page 3: Critical thinking

Construction

Why The Design Was Chosen

Simple Design

Cost Effective

Practicality of Construction

How it was built

Materials Used

Balsa Wood

Gorilla Glue

Various Tools

Page 4: Critical thinking

Testing and Failure Analysis

11.44 oz

Failed at 376.09 lbs

Strength-Weight Ratio 526

Started to Crack during testing

Wood, not glue, failed

Deflected 0.25 in

Page 5: Critical thinking

Improvements

Increase number of girders

Thinner and taller girders

Have curved girders

Reconsider number/position of cross bracings

Overall: Increase moment of inertia near the load

Page 6: Critical thinking

What We Learned

Simple design balances practical construction

with high SW ratio

To consider materials and tools available when

choosing the bridge design

How to incorporate the governing engineering

principles into design

Page 7: Critical thinking