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Bridge

Project

Identifying the Problem

Final Design

Objective: To build the strongest bridge that will hold the largest applied load before failure

  • Total Number of Sticks: 169
  • Weight: 8 oz
  • Efficiency Score: 250 lb / 8 oz -> 500

Materials: 4.5" x 3/8" x 1/12" popsicle sticks

Elmer's Wood Glue

Bridge Dimensions: Length: 20-24 in

Width: 4-6 in

Height: 3-18 in

Testing

Since the prototype was a design sketched out and I cannot test out a sketch, I will proceed straight towards the Final Design step

Venkat Bridge

Model/Prototype

Strategy

  • Using West Point Bridge Designer, design Howe, Pratt, and Warren trusses using only carbon steel hollow tubes, and determine the cheapest truss design.
  • Use the John Hopkins Bridge Designer to find the forces applied on each member, with the cheapest truss design.
  • Draw out the truss of the bridge in full scale.
  • Using the drawings, make any necessary modifications, and build the bridge.

Select Possible Solutions

Research/Brainstorm

Research

Brainstorm

Howe Truss

Pratt Truss

  • A bridge consists of trusses on the sides, as well as a deck on the bottom
  • The bridges may undergo "buckling" on compression members
  • Load under Tension Tests: I approximated that each of my popsicle sticks can hold up to 30 lbs

  • All three truss designs were designed with carbon steel hollow tubes.
  • Prices for each truss design:
  • Howe Truss - $180,206.88
  • Pratt Truss - $182,356.83
  • Warren Truss - $179,680.01
  • All had similar stability

Key Terms

  • Howe Truss
  • Pratt Truss
  • Warren Truss
  • Joist
  • Plank
  • Truss Joints

Warren Truss

My Reflection

If I were to construct a bridge again, I would build the platform/roadbed first, and then the trusses.

Akaash Venkat

Principles of Engineering, P8

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