structures

© Boardworks Ltd 2004 of 17 Structures These icons indicate that detailed teacher’s notes or useful web addresses are available in the Notes Page. For more detailed instructions, see the Getting Started presentation. This icon indicates the slide contains activities created in Flash. These activities are not editable.

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Structures

These icons indicate that detailed teacher’s notes or useful web addresses are available in the Notes Page.

For more detailed instructions, see the Getting Started presentation.

This icon indicates the slide contains activities created in Flash. These activities are not editable.

What are structures?

• Structures are all around us• They come in all shapes and sizes• All structures have 3 things in common:

– They must resist forces– They must not collapse during use– They must hold parts in right places

Contain the essential partsSpan a gap

Protect the contents Support something

What does a structure do?

Categories of structures

Types of structure

Designing strong structures

Stability – why things don’t fall over!

All structures need to be stable.

Stable structures are not likely to move beyond the limits they were designed for.

Look at the structures below. What makes these structures stable or unstable?

Reinforcing structures

• Structures can be made stronger by adding some amounts of material at the right places

• Adding strength to a structure in this way is called reinforcing a structure

Reinforcing structures

Brace– is used to stiffen the framework

of a structure

Webs- added to a corner to prevent the sides to move

Reinforcing structures

• Ribs– added to prevent the structure from caving in

• Folds– by folding the sheet materials can make a structure more rigid

Describe it

Describe each of the structures above.What is it made from? How many pieces are there in this structure? What is the purpose of each part? What methods has the designer used to make it a stable structure?

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