First of all i want to thank you because of your visit from our site and then i want to describe you in brief what actually the means of this site is .This site is a non profit educational Persian site and mostly discusses over structural design, behavior, construct, destruct, repair and... of reinforced concrete or other interesting materials of buildings structural elements. although this site is mostly designed in Persian but as you know and its inevitable many of the sources and medias of this site is in English and this helps the clever and interested visitors from other languages  use and understand many of the sources and media and data  on this site . this station belongs to all the students and researchers and at last i want to tell you to be free and help yourself  and also be critical and send your useful suggestions about this site to the addresses and email below .