Structures

Structures

1. Man made structures

   • Are made by people to satisfy a need.Come examples are the legs of a table or a case of a camera
   • There are three types of structures:The massive structures,The vaulted structures,The Triangular and The suspended structures
     • The massive structures:The first man-made structures were carved from rocks or were built by stacking rocks or other materials.This left little space between them,like in the Mayan or Egyptian pyramids
     • The vaulted structures:Are formed by arches and vaults using stones that are cut in such a way that the only stress they support is compression- no problem for hard stone
     • The triangular structures these structures are made from bars ,normally metal or wooden.The use of triangular shapes means they are not easily deformed.This makes them ideal for building bridges(triangular beams),covered wit the large trusses and vertical structures,like towers and scaffolds

2. The natural structures

   • Are not made by man.They are in living beings,in their composition,or the result of a geological process,for example,the shell of a crab,a bird`s nest or a cave