Ultimate maximum compressive strain in concrete in eccentrically loaded reinforced concrete columns

摘要

Analysis of reinforced concrete columns subjected to loads with uni-axial eccentricity forms the basis of any reinforced concrete column analysis. The results from the analysis of uni-axially loaded columns are used in the analysis of biax-ially loaded columns. Axially loaded columns are a particular case of eccentrically loaded columns when eccentricity is zero. Also axially loaded column occur rarely in practice because some bending (eccentricity of loading) is almost always present, in the form of imperfection caused due to material non-homogeneity, load application etc. The materials making the column namely concrete and steel contribute strength to a reinforced concrete column, which in turn is governed by the strain to which the materials are subjected to. The columns in general are subjected to predominant compression and even in case where tension is critical, the maximum load or ultimate load is governed by the maximum compressive strain in concrete. Therefore the strength of an eccentrically loaded column is always dictated by the maximum compressive strain in concrete.