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A stiff structure is one that is safe and will not fail under the conditions for which it is designed. Structures often gain stiffness from having a triangulated structure. There are many examples of triangulated structures such as house roofs, bicycle frames, electricity pylons or bridges.


Let's see an example:
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Stiffness

Apply a pushing force as shown, and observe what happens to the frame.


Can you think of anything that can be done to prevent the structure from deforming like this?

The next illustration shows the simple triangulated system

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