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structures (forces (the forces that act on a structure are called loads…

- - - - fixed or permanent loads
        
        don't vary over time. They always affect the structure in the same way. For example, the object's own weight, the weight of bodies always on top of another objects, etc
      - variable loads
        
        are occasional and changeable. For example, the weight of snow on a roof, the pressure of water on a dam( the water level can vary )
- - - - the characteriscs of the load ( intensity, direction, trajectory and point of application)
      - the shape of the object bearing the loads
    - - traction
        
        forces try to strech the object they are acting upon
      - bending
        
        forces try to bend a body.
      - compression
        
        forces try to flatten or compress a body