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structures (Stresses (The forces that act on an object that produce…

- - - - The characteristics of the load.
      - The shape of the obiect bearing the load.
    - - Bending
        
        Forces try to bend a body. This stress acts on elements that are support at their extremities and have a weight applied to them. Normally, there are two forces that are separated by a certam distance and a third force acting m the opposite direction.
      - Compression
        
        Forces try to flatten or compress a body. Opposing forces move inwards towards one other along the same trajectory and in opposite directions. The body tends to lose its shape and becomes compressed.
      - Traction
        
        Forces try to stretch the object they are acting upon. Opposing forces move outwards away from the body along the same trajectory but in opposite directions.
      - Torsion
        
        Forres try to twist a body They try to turn the ends of the body in opposite directions.
      - Shear or cutting
        
        The forces act hke two scissor blades. they are very close together,
        moving in opposite direcuons, as they try to cut an object.
        This stress is the same when we put an oblect over the edge of a table and hit n to try and break it This is also called tensile stress.
- - - - The forces that act on a structure are called loads.
        
        F ixed or permanent loads :
        
        Don´t vary over the time. They always affect the structure in the same way
        
        Variable loads :
        
        Are occasional and changeable