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Nikki Flesher
Nikki Flesher

Bridge History, Design, and Engineering Concepts.

You're an engineer and must design a bridge for the city of Greenville. The city wants a traffic and pedestrian bridge spanning over a river that is 800 feet. What bridge type would you use and why?

BUILDING BIG: All About Bridges
pbs.org

BUILDING BIG: All About Bridges

Since the span is only 800 feet an arch bridge would reach that span distance. However arch bridges limit the size of boats that can pass over them. If this waterway was a busy port area it would be important to consider the size of boats that would need access to this area. A suspension bridge or even a drawbridge might be more suitable for this crossing. Suspension bridges can span distances of up to 2000 feet, they are one of the strongest and sturdiest bridge types as well. A drawbridge would work with a span of 800 feet as well, but depending on what the city wanted, some people do not like the look of a drawbridge, especially if the waterway is surrounded by nature or is a harbor that opens into the ocean. So if I was proposing a new bridge design for Greenville I would suggest the benefits and beauty of constructing a suspension bridge.

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Bridgehunter.com: Historic Bridges of the United States.
bridgehunter.com

Bridgehunter.com: Historic Bridges of the United States.

Find 5 to 10 different notable bridges in the United States. Write the location (the state and city), the length of the span in feet, the type of bridge, the materials the bridge is made from, and what type of landform does it cross.

Use the flipbook template I've given you to include a detailed illustration that is colored, labeled and has a background, along with the information written that is listed above.

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Describe the forces that act upon bridges? What causes a bridge to fail?
pbs.org

Describe the forces that act upon bridges? What causes a bridge to fail?

Use the various links on this website to describe the different type of forces that act upon bridges. Examine the failure of the Tacoma Narrows Bridge, illustrate the forces and parts of the bridge that were weak in your science notebooks. Provide an explanation in the space below.

Answer:
Tension is the force of pulling apart while compression is the force of squeezing together. Suspension bridges can handle the forces by creating tension in the cables and compression in the towers. When a suspension bridge is built with a truss system that is underneath the roadway bed, this creates one of the strongest bridge types that can span the greatest distances.
The Tacoma Narrow's Bridge in Washington failed because designers placed a solid girder support under the roadway bed, instead of using a truss design. This did not allow wind to flow through the bottom of the bridge which resulted in the wind causing a vortex reaction. These vortices resulted in the bridge completing failing due to the extreme torsion or twisting that the bridge experienced while there were high winds.

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What types of shapes and designs work the best to hold the most weight?
mysteryscience.com

What types of shapes and designs work the best to hold the most weight?

After conducting the paper bridge experiment, our group discovered that the just folding the paper into an arch underneath a beam brace was not going to hold the most weight. When we designed our bridge this way, it only held 20 pennies.

We found that rolling smaller pieces into column shapes and placing at least 4 columns underneath the beam was the most successful. When we used this shape, our bridge held 80 pennies.

Conclusion: Arch bridges can hold weight, but depending on the length of your span and the amount of weight your testing, cylinder shapes proved to be the strongest shapes when support a horizontal beam.

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