Structures LESSON 2 Links to last lesson In

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Structures LESSON 2

Structures LESSON 2

Links to last lesson In the previous lesson you looked at different types of

Links to last lesson In the previous lesson you looked at different types of structures This lesson you will use your practical skills to create a bridge

Triangles are very good at distributing loads A force placed on the top of

Triangles are very good at distributing loads A force placed on the top of a triangle will result in the sides being in compression and the bottom of the triangle being in tension What is tension? This is a force that pulls two points apart What is compression? This is a force that pushes two points together

Using triangles Triangles are used in many products to distribute the load. They can

Using triangles Triangles are used in many products to distribute the load. They can be used to transfer compressive forces in to tension forces.

Triangles are often used in the design of bridges In these examples the triangles

Triangles are often used in the design of bridges In these examples the triangles are used to transfer the forces created by the loading on the bridge to tensional forces in the steel and compressive forces in the concrete. Why do you think that the steel is used in tension? Why do you think that the concrete is used in compression?

Spaghetti bridge You are going to work in groups to design and build your

Spaghetti bridge You are going to work in groups to design and build your own spaghetti bridge. The facts Spaghetti is good in tension Spaghetti is weak in compression The supports are 350 mm apart The bridges will be loaded in the centre

Making the bridge Most bridge design have two identical sides joined together Draw accurately

Making the bridge Most bridge design have two identical sides joined together Draw accurately on paper the bridge design Start by drawing two rectangular 350 mm apart to represent the two supports Use a ruler and start to draw the side profile of your bridge

Making the bridge Start to lay the pasta over your paper drawing and cutting

Making the bridge Start to lay the pasta over your paper drawing and cutting it to size, using scissors Once it is all laid up and cut to size glue the pasta in place together with the glue guns Next make the second side, it best if these are identical

Making the bridge Ensure that you have two identical sides Make the base of

Making the bridge Ensure that you have two identical sides Make the base of the pasta bridge, remember to think about where the mass will hang Attach the base and side together with the testing block in place

Testing As a class the bridges will be tested one at a time You

Testing As a class the bridges will be tested one at a time You will all need to wear safety googles for the testing

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