Structures

Structures

1. All phisical bodies have a structures. An elephant skeleton or the grooves on a plastic cup are example of stuctures.

   • Natural structures
     • The natural structures are not made by man. Example: the shell of a crab, a bird's nest or a cave..
   • Man-made stuctures
     • The man-made structures are made by the people tos satisfy an need. For Example: the legs of a table orthe case of a camera.

2. ·

   • Forces and Loads
     • A force is anything that can deform a body (static effect) or make it move or stop (dynamic effect)
       • Fixed or permanent loads
         • Are constant they don't vary over time. An example would be the weight of the structure of a bridge an its components part (columns, road surface......)
       • Variable loads
         • Vary over time, like the trafic going across a bridge or the wind hitting
           • Loads
             • A load is a force that acts on a structures it can be fixed or variabl,e
               • Loads produce stress on the structure of a body