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Studying the Behavior of Reinforced Concrete Columns Confined by Steel Structure Under Eccentrically Loading

Abstract 
This research paper presents an analytical study of a number of Reinforced  Concrete Columns models which have rectangular cross section and confined/unconfined by steel Structure of vertical angles and horizontal plates. Columns are subjected to centric and eccentric compression load. The objective is to know how far the bracing is effective in increasing the strength of these columns. This type of strengthening is considered better than the concrete Structure, Carbon Fiber Reinforced Polymer (CFRP) and other types because it has many features, easy and fast to be constructed. The study demonstrated that the bracing by steel Structure led to increase the strength in large ratios and had been clear that once the thickness of steel Structure is increased, the strength increases. And once the eccentricity is increased, the strength decreases and also the failure load. 
Keywords: reinforced concrete columns, bracing, steel structure, centriccompression, eccentric compression, steel structure thickness, strengtheningeffectiveness, failure load.