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Seismic maps in Bolivar's countries

Abstract:

The seismic zonification of the current regulations, updated to the year 2000, in Venezuela, Colombia, Ecuador and Perú are analyzed. Previously, the zonifications obtained in the same countries, using the regulations of the early eighties, when seismic danger started being calculated in probabilistic terms, were compared to current regulations. On the other hand, an isoacceletarions map for Latin America, done by CERESIS in 1996, is presented. The map shows the degree of correlation existent with the seismic zonifications of bolivarian countries. The zonification maps analyzed present the maximum soil acceleration in rock and hard soil, for a useful structure life of 50 years, and an excedence probability of 10%. This is the base to obtain elastic design spectra. Thereinafter, the need to have a new presentation format of the seismic zonification is remarked, in such a way to allow finding the maximum soil acceleration for different return periods of the structure. Finally, the importance factor of different codes is analyzed, and the excedence probability is determined, for maximum soil accelerations of 40% of gravity, in buildings for different uses.