HAZARD--CONSISTENT DESCRIPTION OF SEISMIC ACTION FOR A NEW GENERATION OF SEISMIC CODES: A CASE STUDY CONSIDERING LOW SEISMICITY REGIONS OF CENTRAL EUROPE

摘要

The aim this paper is to study hazard-consistent spectra for a set of 64 sites (data points) within Germany and to compare them with the so far discussed standard elastic response spectra for both, the Eurocode 8 (EC 8) and the proposed new German seismic code, which considers a greater variety of subsoil types. The mentioned 64 target points provide a good representation of the characteristics of all seismic zones on the basis of a new generation of probabilistic seismic hazard assessment (PSHA). The hazard consistent spectra were derived from classical PSHA and considering all uncertainties based on a logic tree approach. The used spectral acceleration relations rely entirely on European strong-motion data. Hazard-consistent spectra were determined also for mean hazard curves of the defined seismic zone levels. All studies were carried out for mean and 84%-fractile spectra as well as for stiff site conditions. It can be recognized that the hazard-consistent spectra are in much better relation or agreement with recently proposed spectra for seismic zones in Germany than the EC 8 spectra. The shapes of the hazard-consistent spectra show minor variation between the different seismic zones only. A new quality of hazard-consistent spectra could be derived from logic tree PSHA using the FRISK88M code [Risk Engineering Inc., 1996]. These results, which were also achieved from calculated magnitude-distance bins, are discussed as well.