A study on the bearing capacity of compressed corrosion-affected reinforced concrete elements subjected to transverse impulse loading

Introduction. Finding the bearing capacity of compressed columns subjected to a combination of effects (normal static and transverse dynamic loading), including emergencies and taking into account the actual condition under various corrosion and other environmental effects, is a relevant though understudied problem. It requires analytical methods, labor-intensive finite element models, and a great number of parameters that should be taken into account.

Materials and methods. The solution was obtained analytically. The finite element model was developed in a 3D formulation to evaluate the applicability and convergence of results. Analytical results were compared with those obtained experimentally.

Results. An analytical technique was developed for the approximate evaluation of the bearing capacity of centrally compressed corrosion-affected reinforced concrete columns under transverse impulse loading in an emergency situation. The results obtained analytically were compared with the results of finite element modeling and well-known full-scale experiments that involved a specific column attachment pattern. A discrete-time model is proposed to take into account corrosion damage in 3D finite element schemes. This model is based on the parabolic law of mechanical characteristics of concrete that deteriorate along with the depth of corrosion propagation.

Conclusions. The authors found that a greater corrosion damage to concrete leads to its non-plastic destruction in the case of exposure to emergencies, and deeper corrosion damage under great compressive loading leads to the local loss of stability of reinforcement bars in the zone affected by transverse impulse loading and a great reduction in the column resistance to progressive collapse. The practical applicability of the proposed engineering method is proved for the range of relevant values of compressive loads.

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