IES Clara Campoamor. La Solana. Technologies Department. http://www.animatedworksheets.co.uk/webgate.html

http://www.technologystudent.com/struct1/struindex.htm

UNIT 3. STRUCTURES AND FORCES

1. A STRUCTURE

A set of elements that can bear burdens

Without breaking them

Without being deformated too much

Hold loads

Limit a space

Protect a space

WHAT’S IT?

FUNCTIONS

TYPES

IES Clara Campoamor. La Solana. Technologies Department. http://www.animatedworksheets.co.uk/webgate.html

http://www.technologystudent.com/struct1/struindex.htm

IES Clara Campoamor. La Solana. Technologies Department. http://www.animatedworksheets.co.uk/webgate.html

http://www.technologystudent.com/struct1/struindex.htm

2. TRIANGULATED STRUCTURE

There is a type of Frame Structure.

Constituted by bars that are united to form triangles

TRIANGULATION They are light and very resistant

An example of triangulation: a crane.

Triangles are seen around us especially in the construction industry in building structures.

They can be large or small

They can be permanent or temporary

Look these examples:

Now, pay attention to the triangles of each structure

EXAMPLE: A house

The roof is a triangle.

The walls are constructed and then structural roof timbers are set in position.

IES Clara Campoamor. La Solana. Technologies Department. http://www.animatedworksheets.co.uk/webgate.html

http://www.technologystudent.com/struct1/struindex.htm

Exercise

Why?

A triangle is a very strong shape.

Rain water runs off the roof down the drainpipes, away from the house.

3. FORCES

IES Clara Campoamor. La Solana. Technologies Department. http://www.animatedworksheets.co.uk/webgate.html

http://www.technologystudent.com/struct1/struindex.htm

TENSION: A pulling force that will try to stretch or lengthen.

COMPRESSION: a pushing force that tries to squash or

shorten.

BENDING: Forces try to cause bending or deformations

SHEAR: Sliding forces that act in opposite directions.

TORSION: Forces cause twisting