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Seismic assessment of steel structures through a cumulative damage

  • Perera, R. (Department of Structural Mechanics, Technical University of Madrid (UPM)) ;
  • Gomez, S. (Department of Structural Mechanics, Technical University of Madrid (UPM)) ;
  • Alarcon, E. (Department of Structural Mechanics, Technical University of Madrid (UPM))
  • Published : 2001.09.25

Abstract

In the present work a constitutive model is developed which permits the assessment of the structural performance through a criterion based on cumulative damage. For it, a damage index is defined and is evaluated through the application of the Miner's rule in low-cycle fatigue. However, the damage index is not considered as a posteriori variable since is incorporated explicitly as an internal variable in the constitutive equations which produces a direct coupling between the damage and the structural mechanical behaviour allowing the possibility of considering as a whole different coupled phenomena. For the elaboration of this damage model, the concepts of the mechanics of continuum medium are applied on lumped dissipative models in order to obtain a coupled simplified model. As a result an elastoplastic model coupled with damage and fatigue damage is obtained.

Keywords

continuum damage mechanics;low cycle fatigue;steel structures;seismic design;simplified model

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