ABSTRACT
A methodology aiming at the evaluation of seismic reliability of structures is presented in this paper and is applied to Moment-Resisting-steel-Frames (MRF) designed according to three different criteria leading to Global-MRF (GMRF), Special-MRF (SMRF) and Ordinary-MRF (OMRF). The aim is to focus on the performances, from a probabilistic point of view, coming from the application of these criteria. The reliability analysis has been carried out considering all the randomnesses concurring to the seismic response of structures: mechanical properties of materials, vertical loads and earthquake action. The probabilistic analysis is developed by means of the Monte Carlo method which consists in generating geometrically equal structures, but structurally different in terms of distribution of vertical loads and material properties. In order to obtain a statistical sample of the structural response, the generated structural sample is successively subjected to nonlinear dynamic analyses. Finally, the seismic reliability of structures is determined by means of fragility curves.
