Miniature Bridge Design Ideas: Simple or Complex?

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Discussion Overview

The discussion revolves around designing a miniature bridge using limited materials (play-dough, straws, and rubber bands) within a short time frame. Participants explore various bridge designs, weighing simplicity against complexity in the context of a school project.

Discussion Character

  • Exploratory
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant is considering a simple design like a king or queen post versus more complex designs such as a solid ribbed arch or a through truss, seeking suggestions.
  • Another participant prompts for more details on the original poster's design ideas and the tradeoffs involved.
  • A participant reflects on the time constraints and material limitations, suggesting that a king's post design may be more feasible given the risk of an unfinished bridge.
  • There is a query about the length of the straws, indicating that their use in compression could be problematic while tension might be easier to manage.
  • A participant provides information about the available materials, noting they have 50 straws and 300 rubber bands.

Areas of Agreement / Disagreement

Participants have not reached a consensus on the best design approach, with multiple competing views on the complexity of the bridge design and the implications of time and material constraints.

Contextual Notes

Participants have not specified the exact length of the straws, which may affect design choices. The discussion also lacks clarity on how the materials will be utilized effectively within the time limit.

Who May Find This Useful

Students or groups involved in engineering challenges, educators looking for project ideas, and individuals interested in practical applications of bridge design concepts.

dabomb14
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So I am the leader of a small group who has to build a bridge in 30 minutes on the last day of school. The only materials we can use are play-dough, straws, and rubber bands and it has to stretch 30 cm between two tables. Though I was looking for some ideas of a bridge design to use. Should I go with something simple like a king or queen post or something more complicated like a solid ribbed arch or a through truss? Any ideas or suggestions would be appreciated.
 
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dabomb14 said:
So I am the leader of a small group who has to build a bridge in 30 minutes on the last day of school. The only materials we can use are play-dough, straws, and rubber bands and it has to stretch 30 cm between two tables. Though I was looking for some ideas of a bridge design to use. Should I go with something simple like a king or queen post or something more complicated like a solid ribbed arch or a through truss? Any ideas or suggestions would be appreciated.

Welcome to the PF.

Can you say more about your own ideas for design options? What are the tradeoffs?
 
After thinking about the time it would take to do something very detailed, I was thinking about doing a king's post design. The main tradeoff would be time and material. If it is not completed in time or we a end up short a little of materials to finish, then obviously an unfinished bridge is going to fail.
 
How long are your straws?

Using them in compression is problematic, tension is easier to maintain.
 
I assume basic straw length. We get 50 straws and 300 rubber bands.
 

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