Abstract
The use of two-level control systems in structures is one of those having attracted the attention of researchers in the last decade. The design idea of the mentioned systems is to combine two separate control systems with different stiffness and strength in series, which creates dual seismic behaviors due to appropriate energy dissipation at different levels of earthquakes. In this study, at the first stage a two-level passive control system using friction-yielding top plate in beam-to-column rigid connections is presented and its cyclic behavior is evaluated with nonlinear static and dynamic analyses using finite element method by ABAQUS software. In the next stage, the hysteresis curves are investigated, which indicates a very ductile behavior for the proposed damping system in the rigid connection. In addition, the obtained hysteresis curves show that the system can reliably dissipate energy at different earthquake levels, as expected, satisfying the seismic criteria for the special moment resisting frames. In this system, maximum base shear decreased by 20% compared to traditional rigid connections in a single-story moment frame under dynamic time-history analysis.
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