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Solid heavy and very sturdy structures.
Structural element: very heavy materials

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These are constructed with lintels.
A lintel is a horizontal beam placed on vertical support used to cover spaces.
Structural element: the lintel.

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Arches and vaults are formed by stone blocks supported by their own weight.
They are used to co er a space between two pillars or walls.

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These structures are formed by bars arranged to form triangles or trusses.
They are lightweighted but sturdy.
Structural elements: triangles and trusses

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These are made up of sheets that form a protecting housing and support.
Structural element: sheets

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These structres were invented by the archited Richard Buckminster Fuller and pantented in 1954. They are globe-shaped structures formed by triangles that, im turn, form pentagons or hexagons.

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7. Cable-stayed or suspension structures

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7. Cable-stayed or suspension structures

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These structures are held in place by stay cables, usually made from steel, attached to sturdy supports
Structural element: stay cables

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These are formed by pillars and beamsthat are connected to each other and, along with the foundations acts at supporting elements.
Pillars are vertical elements that support the beams.
The beams are horizontal elements that support the weigth of the floors and ceilings.
Structural elements: pillars and beams.

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These are formed by canvases stretched by compressed air.
Structural elemts: canvas stretched by the use of compressed air.

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when you put toothpaste in your brush by pressing on the tube, you're compressing the tube. 

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Teo opositely directed forces acting on a body.

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when you sit on a swing you are creating tension

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Two opposite directed forces acting on a body, tending to strech it

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When you jump in the trampoline you are bending it

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Caused by two forces acting on a body tending to flex or bend it.

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When you cut your nails, you are creating shear

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Caused by teo oppositely directed forces acting on a body along vere close lines of action, tending to cut it.

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when you drain the clothes after washing them you're creating torsion.

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Caused by two oppositly directed forces acting on a body, tending to twist it.

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The structures must resist the forces which it is subjected over it useful life.

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Trussing is a method for making weak structures more rigid by dividing it into triangles.

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The structure must reamin rigid. It must not deform under the action of the forces to which is subjected over its useful life.

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Inestable building in Taiwan.The centre of gravity must be stable.

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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.