Seismic loss analysis of buckling-restrained braced frames considering the effects of modeling uncertainties

While the design criteria for buckling-restrained braced frames are advancing, understanding the functional behavior of these types of frames during the occuring earthquakes can considerably contribute in the evolution of the design criteria for these frames. In this regard, taking the modeling uncertainties into account will help in carrying out a more rational seismic performance assessment and seismic design of these types of structures. The main goal of this manuscript is to include the modeling uncertainties in the seismic loss mathematical curves of the buckling-restrained braced frames (BRBF). The variation of the modulus of elasticity and the yield strength constitute the sources of the uncertainties for this study. The two-dimensional 4-, 8-, and 12-story frames ,selected from symmetrical three-dimensional structures, were studied. Finally, it was concluded that the uncertainties existed in the yield stress and the modulus of elasticity parameters were more effective on the probabilistic seismic demand curves for the lower intensity levels, than the higher strong ground motion intensities. Besides all these, the variations of seismic-induced loss curves are presented considering the effect of the uncertainties compared to those neglecting the uncertainties. The calculated loss curves confirm the significance of taking the sources of uncertainties into account in the seismic loss analysis of the structures.