Damage Evolution in Steel Structures Under Seismic Excitation

Abstract eng:
For the purpose of energy dissipation steel structures exposed to seismic loading intentionally experience inelastic material behavior. Experiments of mild construction steel have shown that the behavior of structural steel is highly sensitive to loading velocity. Under cyclic loading, the Bauschinger effect decreases the yield stress. In addition, the steel suffers from material damage if the material is subjected to inelastic deformations. Therefore, to evaluate the structural safety of steel structures in case of earthquakes, a more detailed description of the material behavior is inevitable. The proposed material model describes the evolution and distribution of inelastic strains and damage in steel structures under seismic excitation by means of a set of internal variables. The model takes into account viscoplastic material behavior, isotropic and kinematic hardening, ductile damage, and a nonlocal extension in the form of an implicit gradient formulation to overcome the phenomenon of strain localization. To determine the material model parameters, numerical results are compared with experiments under static and dynamic loading. In order to indicate the influence of the description of the material behavior on the respsonse of 3D structures subjected to seismic excitation different approaches for the material are used.

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