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STRUCTURES (Stresses (Main types of stressees (Traction (Forces try to…

- - - - Fixed or permanent loads don't
        vary over time They always affect the structure in the same way.
      - Variable loads are occasional and changeable. For example, the weight of snow on a root, the pressure of water on a dam (the water level can vary).
- - - - 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. The body tends to become longer.
    - - Forces try to bend a body. This stress acts on elements that are supported at their extremities and have a weight applied to them. Normally, there are two forces that are separated by a certain distance and a third force acting in the opposite direction.
    - - Forces try to flatten or compress a body. Opposing forces move inwards towards one another along the same trajectory and in opposite directions The body tends to lose its shape and becomes compressed.
    - - Forces try to twist a body. They try to turn the ends of the body in opposite directions.
    - - The forces act like two scissor blades: they are very close together, moving in opposite directions, as they try to cut an object. This stress is the same when we put an object over the edge of a table and hit n to try and break it.This is also called tensile stress.