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Structures & Forces

Structures & Forces. Define: Structures – What are they? How can we classify them? Demonstrate!. Structures . things that have a definite size and shape , which serve a definite purpose or function .

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Structures & Forces

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  1. Structures & Forces Define: Structures – What are they? How can we classify them? Demonstrate!

  2. Structures things that have a definite size and shape, which serve a definite purpose or function. To perform its function, every part of the structure must resist forces (stresses such as pushes or pulls) that could damage its shape or size. http://www.youtube.com/watch?v=AEAqLb4jqOA

  3. Natural Manufactured We can classify structures as ...

  4. Structures can also be classified by their... Design

  5. Advantages: held in place by its own weight, losing small parts often has little effect on the overall strength of the structure A Layered Look- mass structures are not always solid, but are layered and have hollowed out areas for specific functions. Mass StructuresCan be made by, piling up or forming similar materials into a particular shape or design.

  6. Advantages: because they are relatively easy to design and build, and inexpensive to manufacture, the frame structure is the most common construction choice. All frames, whether simple or complex must overcome similar problems. To solve these problems joints, type of material, bracing, anchoring and design all must be considered in the overall structural frame construction. Frame Structures Skeleton of strong materials, filled and covered with other materials, supporting the overall structure. Most of the inside part of the structure is empty space.

  7. Advantages: two very useful features:- they are completely empty, so they make great containers- their thin outside layer means they use very little material The shape of a shell structure spreads forces throughout the whole structure, which means every part of the structure supports only a small part of the load, giving it its strength. Shell Structures Thin, carefully shaped, outer layer of material, to provide their strength and rigidity.

  8. Football helmets are shell structures - to protect the head, with a frame structure attached in front - to protect the face. - Hydro-electric dams are mass structures, with frame structures inside to house the generators - Airplanes are frame structures, with a 'skin' that acts like a shell - giving it the added strength to resist stresses and making it lightweight and flexible. - Domed buildings combine shell and frame construction - Warehouses are often built with columns to support the roof (frame) and concrete blocks, (mass structures) which stay in place because of their weight. Mix & Match StructuresSome structures are combinations of different types of structures.

  9. Demonstrate your Learning... Your task: Show a natural and manufactured example of each of the 3 types of structures (Mass, Frame, & Shell) 6 Pictures total Choose 1 natural and 1 manufactured example of a mix & match structure. Explain the types of structures involved in each. 2 Pictures total 8 pictures TOTAL

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