Residual resource of emergency-loaded concrete columns under pressure and micro-damage

The study considers a concrete column undergoing emergency loading (compression and bending). Its surface is reinforced by means of a highly strong composite material. Loads yield micro-damage in the compression area of the element, without the attainment of bending and compression limit stresses of concrete and the reinforcing material. The present work is a continuation of previous studies where the authors proposed an approximate calculation method (ACM) of finding stresses and strains in elastically deformed structural elements. The analysis aims at the expansion of the ACM and assessment of the residual bearing capacity of the material. This is done by the introduction of appropriate assessment coefficients. The authors illustrate the approach presenting a test example. Key words: surface-reinforced concrete columns, micro damage, bearing capacity, residual resource