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Triangle Structures & Bridge Building: Architecture & Geometry All In One

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Kobi Russell

on 12 March 2013

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Transcript of Triangle Structures & Bridge Building: Architecture & Geometry All In One

Architecture & Geometry
Intertwined Triangle Structures
and Bridge Building Materials: Which is best? Materials: Which one is best?
Answer Revealed! You may or may not be surprised to learn that Stone is actually the most common bridge building material. I found an article online on ehow.com by Emily Beach on the most common materials used in bridge construction and I included some excerpts on stone as a building material here.
"Natural stone is one of the oldest bridge construction materials. It is strong and able to resist erosion caused by wind and water. Materials such as granite and limestone are naturally attractive and will last for centuries with little or no maintenance."
"It is often used to build bridge piers and footers, which allow the upper portions of the bridge to be built from more affordable and lighter materials." Different Forces Intro to Triangle Structures & Bridge Building Bridge building and triangle structures are both very interesting topics to research and compliment each other nicely. Both topics have to do with what material is used, tensile strength, and other ideas and factors.

In addition to these ideas, there are arguments on which shape is the strongest and I will be discussing that as well.

Now let's find out some more about bridge building and triangle structures! Bridges are built all the time to aid humans in going from place to place over obstacles like water and sink holes, but a bridge can't be made without a strong material! On the following slide, there is a list of the most common materials used in bridge building that I have jumbled up, and your task is to try and guess which is the most common and why. Think about things like the strength of the material but also cost and easy-access to each material. Here we have a "word jumble" of the five most common bridge building materials. They are (not in order): Cement, Steel, Stone, Wood, and Composites. Which one do you think is the most common and why? Materials: Which is best? (cont.) When it comes to building and maintaining a bridge, there are many forces involved in the process. There are five main types of force that can act on a structure. They are:
-Tension: Two pulling forces, directly opposing one another, that attempt to pull an object apart.
-Torsion: Torsion is created when a turning force is applied to a structure and the structure twists.
-Compression: Two pushing forces, directly opposing one another, that squeeze an object and try to squash it.
-Shear: Two pushing or pulling forces that rip or cut an object by sliding its molecules sideways. (If you were to try and pull two pieces of wood apart that had been glued together, the glue joint would be subjected to shear force.)
-Bending: Bending is created when a turning force is applied to a structure and the structure sags or bends. The name pretty much explains Bending.
Each can play a role on how long the bridge stands up, but also how it is built. THE END Weather Conditions
Pros and Cons Bridges are usually built outside, and when something is outside for a long period of time, weather will get to it. There are pros and cons to each material used in bridge building as well as the shape each bridge is made in. When and why do you think you would use each material listed? When and why do you think you would use each shape shown?
Stone, Wood, Steel
Shapes: Arch Triangle Sources Beach, Emily What Are the Most Common Materials Used in Bridge Construction? eHow.com
Fairly Fundamental Facts about Forces and Structures
copyright 2005 by Worcester Polytechnic Institute
D,Tyler Why is the Triangle the Strongest Shape http://www.reference.com/motif/science/why-is-the-triangle-the-strongest-shape
copyright 2013 Dictionary.com
Which shape is the strongest shape? When it comes to which geometric shape is strongest, the triangle is considered the strongest geometric shape but an arch is stronger on its own. The reason for the triangle's strength is when a triangle is subjected to strong forces, it only collapses due to material fatigue (the material getting worn and deteriorated), not because of geometric distortion.

On the topic of arches, arches would be considered half of a circle or a sphere so they are not really they're own shape but one on one the arch is best for supporting weight and beats one triangle easily.
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