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Eurocode 8 spectra are scaled by the peak ground acceleration values that are  defined for the given site through a probabilistic seismic hazard analyses  (PSHA). However, spectra that are created by combining the empirical shapes  with the single PSHA-defined scaling factor will not represent the so-called  Uniform Hazard Spectra (UHS). Moreover, the very shape (Type 1 or Type 2) of  the Eurocode 8 elastic spectrum is selected with respect to the magnitude of  the earthquakes “that will contribute most to the seismic hazard defined for  the purpose of probabilistic hazard assessment…”. Such definition is somewhat  obscure since these “most contributing” earthquakes are, even at the same  site and for the same probability i.e. for the same “return period”,  different (in a general case) for different vibration periods, while the  whole Eurocode 8 spectrum is scaled by using only the PSHA estimate of the  peak ground acceleration. In this Paper we present an illustrative example of  the Uniform Hazard Spectra for the city of Belgrade and compare the obtained  UHS spectra, as well as the scenario empirical spectra scaled for different  earthquake parameters, to the corresponding Eurocode 8 spectra, further  pointing out the intrinsic ambiguities in the current EC8 suggestions for  creation of design spectra. [Projekat Ministarstva nauke Republike Srbije,  br. 36043

facta universitatis - series architecture and civil engineering

Towards preparation of design spectra for Serbian national annex to Eurocode 8: Part II. Usage of the UHS approach instead of normalized spectral shapes scaled by a single PSHA parameter