A nonlocal material model for predicting damage in steel structures under seismic excitation

Abstract eng:
Due to the need of evaluating structural safety of steel structures after an earthquake, a new method is proposed, which combines continuum damage mechanics with seismic engineering. A material model describes the evolution and distribution of damage in steel structures under seismic excitation by means of a set of internal damage 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. Afterwards, the damage variables are transformed into a global damage index in order to make a statement about structural stability and safety. Different tests are used to evaluate the model’s abilities. While static tests on CT-specimens verify the accuracy of the material model, dynamic tests describe the behavior of structures under time-dependent loading. Subsequent to the tests, global damage indices are calculated in order to characterize the condition of the structures.

• Export as: BibTeX | MARC | MARCXML | DC | EndNote | NLM | RefWorks
• Add to your basket