bridges

If I chose the tied arch bridge then the tied arch bridge will hold the most weight because the tied arch bridge will spread the weight evenly across the supports.

I believe this because in my research, I found out that the arch bridges are designed to hold most weight and are very stable for shorter span than the beam and the truss bridges.

1. science used to

2. A truss bridge is constructed of small triangles to help with stability.

3. A beam bridge has a beam with supporting piers underneath it.

4. A tied arch bridge has an arch that is attached to the main beam with chords, all of this is then supported by two main platforms at the bottom.

5.

6. What materials are used for these bridges? Words I can use are:

7.

8. Compression - A force that pushes a object together so it has less volume so its stronger.

9. Tension -A force that pulls an object apart.

10. Load - A object that is lifted up or carried.

11. Pier - A structure that is above the water that helps people get in and out of boats.

12. Beam - A long structure which is supported on dock.

13. Arch- A curved structure which supports a building or a bridge.

14. Stability - How well a object or a structure can stay together and withstand forces.

15. Span - A stretch between two limits.

16. Engineering - Knowledge of math and design structures and machines.

My topic is comparing three different bridges to see which one can hold the most weight.

Truss bridge

A truss bridge is a strong bridge made of strong triangles

the triangles make the bridge very strong these bridges

are often made of metal and wood these bridges hold

trains and people it also serves as a walkway for the people.

Some types of truss bridges are Warren truss, fink truss,

bowstring truss and more.What makes a truss bridge

strong is it spreads the weight among all of the triangles

so it stays strong. Some shapes the truss bridges use are

Triangles and squares.

Beam bridge

A beam bridge looks simple it's a long plank supported

on each end it works by distributing the weight among

the flat surface and beams.Beam bridges are usually used

To cover small distances like small rivers and roads because

There easy to build and strong for a everyday use.Some shapes

That are used in a beam bridge are a rectangles.Some types

of beam bridges are Simple beam bridge, Box Girder bridge,

Cantilever beam bridge. a sorter span.

They are one of the oldest and strongest bridges!

Tied Arch bridge

A tied arch bridge is a structure which has a curved

shape underneath it the curve or arch helps

spread the weight evenly so the bridge stays

strong.these bridges are made of stone

,brick or metal they are used to cross rivers, valley or

Roads.some shapes the arch bridge uses are arches.

the High level bridge is an example of a bridge

In calgary.A arch bridge is meant for

Manipulated / Independent Variable

ONE thing that you will test/Change :I am changing the bridge design.

Responding / Dependent Variable

The thing I think will change or be affected: The bridges will be affected when i put weight on them.

How will you measure it? : I will measure the bridges by putting weight on them and finding out which one can hold the most weight.I will put weight till two snap.

Controlled Variables

Things we have to be very careful to keep the same every time we test so that they do not affect the results/outcome of the experiment:

• The materials we used for each bridge.

• The testing method applied to each bridge -same types of weight, same place for testing.

• The size of the bridges.

1. Build 3 sets of various types of bridges using popsicle sticks and hot glue.

1. Truss

2. Beam

3. Tied Arch

2. Using weights (g), test and record the weight each bridge withstands and record the data on the table.

3. Analyze and observe The data

Observations:/Notes I observed that when applying the weights on the tied arch bridge, the arch shape was very strong. The beam bridge was good, it held a decent amount of weight but it had no special shape that made it stronger. The truss bridge was strong too, the triangles made it more sturdy

Observations/Notes: The tied arch held more weight this trial. The beam did carry more weight than last time. The truss held the same amount of weight.

Observations/Notes: The tied arch held more this weight in this trial. the beam did not carry as much weight as last time. The truss did not hold that much weight either.

.

I noticed in my data in the beam bridges data the weight it held was a pattern it went like high low high low also the beam bridges data is the only one with a 3 digit number. I thought that all the data was gonna be the same but no there are some that are the same but others are not.

My question was: which bridge holds the most weight and which is most stable

The answer to my question is: the tied arch bridge held the most weight and was most stable

My hypothesis was correct because: i researched and found information in my slides and the shape is very sturdy in needs a lot of weight to break.

I learned that the tied arch is the most stable and it can benefit engineers and other people who design bridges.

My experiments data was not the same some held more weight some held less weight I could have made the amount of glue for each bridge controlled i also think i could have done just a arch not a tied arch because it has more strength.

Title | Author | Information (web link, publisher, etc) | Year

Arete structures | | https://aretestructures.com/what-types-of-truss-bridges-are-there-which-to-select/ | No date

Teach engineering | | https://www.teachengineering.org/lessons/view/cub_brid_lesson02 | Sept,2024

Britannica | | https://www.britannica.com/technology/truss-bridge | Dec,27 2024

Physics forums | | https://www.physicsforums.com/threads/bridge-beam-shapes-why-are-they-different.812035/ | May,4 2015

Tennessee gov | | https://www.tn.gov/tdot/structures-/historic-bridges/what-is-a-truss-bridge.html#:~:text=The%20bridge%20is%20supported%20at,crossing%20it%2C%20and%20wind%20loads. |

Beam bridge | | https://www.researchgate.net/figure/Diagram-of-Major-Bridge-Components-Nielson-2005_fig1_285068910 | Nov 2015

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