A F.E.M. Model for the Evaluation of the Seismic Behavior of Internal Joints in Reinforced Concrete Frames

Abstract eng:
The seismic performance of reinforced concrete buildings cannot be fully understood aside from the beam-column joints. The capacity design (and the subsequent strength hierarchy) or the displacement ductility design are modern design principles and they are strongly subordinates to the beam-column joint panels behavior which can reduce substantially the global ductility, if the joint is subjected to a premature failure. Both the cracking of the joint panel zone, the slipping of the passing through steel reinforcement rebars can generate additional deformability and they can alter the strength hierarchy between the elements converging into the beam-column joint. The present work focuses on these two aspects using a refined finite element non-linear modeling technique. A numerical-experimental comparison is discussed that validate the adopted numerical model. Numerical results were compared to experimental data and were found to be in good agreement with the test data, thus validating the methodological approach.

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