8B. ANALYSIS PART 2

CHAPTER 8B 'ANALYSIS' 32 a method of evaluation and redesign (which can be followed as an alternative to the current method). Seismic class is the maximum rating or redesign target for a given level of performance. It is derived from the combination of performance level and αg rate. The seismic classes for performance level B are considered as basic seismic classes. Based on the above table we can summarize that my level of performance determines m, q (elastic) and θu (inelastic) and my return period and exceedance probability determines the seismic acceleration αg. The three valuation targets (or the three seismic classes) for a 10% earthquake are still called A1, B1, C1 and have a factor of one but the targets for a 50% earthquake are now called A3+, B3+, C3+ and have a factor of 0.45 (from 0.53 previously). Still the two basic seismic hazard categories are no longer 10% and 50% but 10% with a factor of 1 and 30% with a factor of 0.60 (the two lines in bold in the table). In the parameters of the 5 scenarios related to EIS there is now a new field for the ground acceleration that will be calculated and used based on the above table. Going to the framework We select the seismic hazard category with the corresponding triad of seismic classes and the factor by which the initial reference ground acceleration will be multiplied in order to obtain the ground acceleration of the CANEPE