structures and forces .

structures and forces

1. Designing a structure

   • For saftey
   • For forces on a bridge
   • For loads

2. Types of structures

   • Frame structures
     • Are made up of parts fastened together.
       • Examples are ,your skeleton, a spider web and a tennis racket.
   • Shell structures
     • Are rigid round structures that are hollow inside.
       • Igloos, egg cartons, eggs ,and a blown up balloon are examples.
   • Combination structures
     • Are structures made of shell ,solid ,and frame structures
       • Houses ,offices ,and skyscrapers are all examples of combination structures.
   • Man made structures
   • Natural structures
   • Solid structures
     • Are structures that are generally solid all the way through.
       • Some examples are: a sand castle, a concrete pillar ,and mountains.

3. Forces

   • Types of forces
     • Internal forces
       • Compression
         • A force that squeezes or presses something together.
       • Tension
         • A force that stretches apart to expand or lengthen.
       • Shear
         • A force that pushes in opposite directions.
       • Torsion
         • A force that twists
       • A part of a structure acting on another part of the same structure
     • External forces
       • Forces that act on a structure from the outside
         • An example is the wind
       • loads
         • Dynamic load
           • The moving load on a structure
         • Static load
           • The effect of gravity on a structure
   • Plane of application
     • The side affected by a force.
   • Point of application
     • The point where a force meets a structure.
   • A force is any push or pull on a structure.

4. Form

   • Is the basic shape of a structure

5. Function

   • Is the job a structure does. Each structure has a job or function.

6. Sensors

   • Motion
   • Tempreture
   • Smoke
   • Light

7. Materials used for building a structure.

   • Beam
     • box beam
     • I-beam
   • Arch
   • Cantileaver
   • Column
   • Corrugated
     • Cardboard
     • metal

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