Confined concrete models according to EC 2 and EC 8 and their influence on the RC frame seismic response

Seismic design according to European norms implies the design of ductile rc structures. By confining the concrete, the ratio of stress-strain is changing and increases ductility. In Eurocode 2, a model of confined concrete was proposed, and in the Eurocode 8 an improved model was shown. The paper also analyzes the compared values of obtained strengths and ultimate strains for both models of confined concrete, as well as their impact on the global and local seismic response in the case of a six-storey rc frame