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In this paper, a new seismic Performance Based Design (PBD) process based ona deterministic definition of the seismic input is presented. The proposedprocedure aims to address the following considerations, arisen from theanalysis of seismic phenomena, which cannot be taken in account using standardprobabilistic seismic input (PSHA): a) any structure at a given location,regardless of its importance, is subject to the same shaking as a result of agiven earthquake, b) it is impossible to determine when a future earthquake ofa given intensity/magnitude will occur, c) insufficient data are available todevelop reliable statistics with regards to earthquakes. On the basis of theseconsiderations, the seismic input at a given site - determined on the basis ofthe seismic history, the seismogenic zones and the seismogenic nodes - isdefined using the Neo Deterministic Seismic Hazard Assessment (NDSHA). Twodifferent analysis are carried out at different levels of detail. The first one(RSA) provides the Maximum Deterministic Seismic Input as a response spectra atthe bedrock (MDSIBD), similarly to what is proposed by the codes. The secondone (SSA) takes the site effects into account, providing a site specificseismic input (MDSISS). A SSA provides realistic site specific seismograms thatcould be used to run time history analysis even where no registrations areavailable. Reviewing the standard PBD procedure, MDSISS is always associatedwith the worst structural performance acceptable for a building, called TargetPerformance Level (TPL). In this way, the importance of the structure (riskcategory) is taken into account by changing the structural performance level tocheck rather than to change the seismic input.

A new design strategy based on a deterministic definition of the seismic  input to overcome the limits of design procedures based on probabilistic  approaches