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Transcript

Making Structures Stronger- Beams (11.2)

Closing

We hope you learned and understood a lot in this lesson. Now that you have learned more about beams and how they support structures, you can apply your knowledge to the real world. If you have any questions please raise your hand quietly until you are picked.

Thank you, we hope you enjoyed this presentation!!!:)

Strengthening the beam

The Cantilever

- Some examples of cantilevers are a branch on a tree, a diving board and balconies

- Cantilevers are good for being built great distances with no central support

- Beams are not strong by themselves

- Beams are weak if they have too heavy loads

- There are many ways to strengthen beams, one way is to change the material or form of the beam (wood, stone, concrete, steel, I-beam, corrugation)

- Materials of structures and beams are important for the stability.

I-Beams:

- I-beams are often used in construction of buildings and houses to support ceilings or floors

- I-beams are light, but they can carry heavy loads

- I-beams help reduce the use of trees in construction, because not as much wood is needed.

Corrugation:

- Placing triangular folds, grooves or ridges in a structure is corrugation

- Corrugation is used in cardboard boxes and in plastic or metal for roofing to provide strength

Rebar:

- Steel reinforcing rods is called rebar (reinforcing concrete)

- A beam has compression at the top and tension at the bottom

- Since concrete is weak with tension, rebar is placed to resist tension

- Rebar also resists compression

Supporting the Beam

- Adding ties, struts and gussets support beams(These are rods that support beams).

Definitions to know

Beams: A horizontal structure designed to support a load.

I-Beam: A beam that is in the shape of the letter "I" when seen from the end.

Corrugation: Multiple folds in a material that provide additional strength.

Cantilever: A beam supported at only one end.

Introduction

Game

Instructions:

In this lesson you will learn about different beams and how to support them. At the end of this presentation feel free to ask any questions that come to your mind about this lesson.

1. Answer the question. Answer must be well developed and have good detail.

You will be working with your group (team).

2. You have 1min to answer the question

3. In the end each group will share their responses and we will determine which answer is the best ( with most detail )

4. The winning group wins a prize

Question:

How is a cantilever different from a fully supported beam?

Rules :

1.No cheating!!!

2.Allow everyone in your group to share their ideas

3.You are allowed to use your resources(ex.handout, textbook) and you must restate the question, provide examples and conclude it.

Bibliography

-Nelson Science Textbook

-Google images

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