Why are arch bridges stronger than beam ones?

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Homework Help Overview

The discussion revolves around the structural strength of different bridge designs, specifically comparing arch bridges to beam bridges, using pasta as a material for a class project. Participants are exploring the mechanics of how these designs support weight.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the reasons behind the strength of arches and triangular shapes compared to flat beams, particularly in the context of weight distribution. There are inquiries about the material properties of pasta in terms of tension and compression, as well as the structural implications of different orientations of pasta noodles.

Discussion Status

The conversation is active, with participants sharing their thoughts on the material properties of pasta and how these relate to bridge design. Some guidance on the strength characteristics of pasta in different scenarios has been offered, but there is no consensus on the best approach yet.

Contextual Notes

Participants are working within the constraints of a class project, which may limit the types of materials and designs they can use. There is also uncertainty regarding the properties of pasta as a building material, particularly in terms of its behavior under different forces.

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When building a pasta bridge, why are arches or triangular peaks able to support more weight than flat beam bridges? Assume the weight would be attached to the base/deck of the bridge.

I'm building a pasta bridge for my Physics class and I was curious. Thank you!
 
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Is pasta stonger in compression or tension?

Also, is there more pasta in an arch/peak or a flat beam?
 
I believe pasta would be stronger in tension, but weak in compression.
 
Oh, one more thing to think about: if you take a flat noodle (e.g. linguini) is it stronger with "edge" vertical or the "flat"?

PS, I am not 100% sure about pasta, but most brittle materials are weak in tension and strong in compression
 

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