Proposed nonlinear macro‐model for seismic risk assessment of composite‐steel moment resisting frames

This paper proposes a macro-model for simulating the hysteretic behavior of composite-steel beams as part fully restrained beam-to-column connections in moment-resisting frames (MRFs). Comparisons with experimental data suggest that proposed model captures asymmetric response including cyclic deterioration strength and stiffness. Moreover, primary slab-column force transfer mechanisms predicts slip demands beam-slab under inelastic loading. The modeling approach is employed system-level study to benchmark seismic collapse risk MRF buildings across Europe. are quantified through development hazard curves. simulation studies examined MRFs exhibit system overstrength about 4. attributed drift requirements current European provisions.1 annualized probability prototype well below 1% over 50-year building life expectancy regardless design site degree composite action. Beam-slab partial action experience minimal damage frequently occurring events (i.e., 50% exceedance 50 years); light cracking slab basis earthquake. above important from repairability standpoint. Accordingly, it recommended 25% reduction shear resistance stud connectors not imperative designs feature steel depths less than 500 mm.