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Structures

Structures. Structures. A structure is an arrangement of parts joined strongly together. Most objects are arrangements of parts, e.g. atoms, crystals, cells. Atoms / Cells. Crystals. Structures. Golden Gate. There are many different types of structures in existence

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Structures

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  1. Structures

  2. Structures A structure is an arrangement of parts joined strongly together. Most objects are arrangements of parts, e.g. atoms, crystals, cells Atoms / Cells Crystals

  3. Structures Golden Gate There are many different types of structures in existence Can you name some structures? Eiffel Tower Examples of structures include – Buildings, Bridges, Cranes, Chairs.

  4. Structures What do you think contributes to strength in structures? Factors that contribute to strength in structures. • The strength of the material • The shape of the parts • The method used to join them together • The manner in which they are arranged This picture shows Buildings, a tower crane and scaffolding Tribal Home

  5. Structures There are many very strong structures to be found in nature. How many can you name? Trees Spiders Web

  6. Structures Naturally strong features in useful designs Bee honeycomb Honeycomb floor mat Mount Everest Pyramid Egypt

  7. Grass Shell Water lily Sea arch Palm tree Structures Naturally occurring structures include: • A grass leaf • A water lily • A palm tree leaf • Sea arch • Car shell

  8. Grass leaf under a microscope Structures Honeycomb used as a core in sandwiched structures, boards and flooring. Grass leaves have a honeycomb structure which, although very light, are also thick and strong.

  9. The Eiffel tower’s giant Lily Pad design of the future. A structure made with parts that extend to meet each other Above the view of the underside of a water lily Structures Water lilies have a web-like structure, which grows from the centre to the outside of the Leaf giving it strength.

  10. Corrugated roofing Palm tree leaf Corrugation used in packaging Structures Palm tree leaves, though light, gain their strength from thin sheets folded into corrugations.

  11. Roman Arch Sea arch Steel arch used to support a roadway Structures Sea Arch. Coastal features, formed by weathering

  12. Thin-shell structures are light weight constructions Structures Shells provide shelter, and protect.

  13. Beams come in various shapes and sizes Beam A beam is a strip or section of material used to span a distance Structures

  14. The shape which is repeated in the images is thetriangle. Structures Framesare structures made from sections of materials.

  15. member Adding one more member makes the frame stable. joint Structures A triangle is one of the strongest frame shapes known to man. The implementation of this concept in design is known as triangulation.

  16. Tie Wall Strut Structures • A strut is the part, which has compressive forces acting upon it. • A tie is the part of a structure which has tensile forces acting upon it.

  17. 300N 60Kg 519.6N 60Kg Structures Calculating Forces The frame opposite supports a Mass of 60Kg. Pin A in the sketch is in equilibrium. Calculate the size of the forces acting on members B and C in the frame. In order to calculate the force of the Mass in Newton’s, the Mass must be Multiplied by 9.81N, rounded to (10).Therefore force equals 600N. Triangle of Forces diagram. The force at B is calculated as: 600 Cos 60°= (600)(0.5) = 300N The force at C is calculated as: 600 Sin 60° = (600)(0.866) =519.6N

  18. Structures Factor of Safetyis used to provide a margin of lee-way of flexibility over the theoretical capacity of the item in question.

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