CYCLIC ELASTOPLASTIC ANALYSIS OF METALLIC DAMPERS FOR SEISMIC ENERGY DISSIPATION

摘要

Metallic dampers can provide an effective means to dissipate energy imparted to a structure during a seismic event. These dampers may comprise a portion of a base isolation or passive energy dissipation system. In either case, the metallic damper represents a critical element in the protective system and, consequently, demands detailed analysis. Here we develop a two-surface cyclic plasticity model for structural steel and discuss issues related to integration of the resulting nonlinear hardening constitutive model. The model is then applied to study the behavior of an E-shaped damper and a triangular plate damper. The former finds application in some seismic isolation systems, while the latter may be employed along with cross bracing for passive energy dissipation. In both cases, numerical results are compared with those from previous experimental investigations.