A structure is a series of connected, interrelated elements that form together a system that can resist a series of external load effects applied to it, which includes its own self weight, and provide adequate rigidity. In civil engineering, a structure is usually made up of, Beams. Columns. Cables. Slabs. Structure is comprised from systems that provide the necessary strength for a building, these systems are then subdivided into linear elements , planar elements and connections, each one of these elements has some characteristics that is taken into account when designing the structure of a building, the location and orientation of any of these sub-systems defines it's behaviour and role in ensuring the structural safety, thus, any flaw in any of these sub-systems will comprise the entire structural integrity and therefore put the strength of the building at risk.