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All structures are based on different structural elements that provide them with sufficent strength.

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A force is an influence that can deform a body or change its movement or produce motion in a body at rest

Stresses are the internal tensions that a body is subjected to when different forces act on it

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Compresion

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Achieving strength, stability and rigidity

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Achieving strength, stability and rigidity

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The structure must remain in stable equilibrium under the action of the forces to which it is subjected over its useful life .

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The structure must resist the forces to which it is subjected over its useful life.

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The structure must remain rigid , i.e it must not deform , under the action of the forces to which it is subjected over its useful life

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Increase stability: the centre of gravity

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Increase stability: the centre of gravity

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Trussing is a method for making weak structures more rigid . It works because the triangle is the only figure that cannot be deformed. Therefore, structures that have a triangular shape are rigid