La aceleración sísmica de cálculo, ac, se define como el producto:
ac = S · ρ · ab
donde:
ab: Aceleración sísmica básica.
ρ: Coeficiente adimensional de riesgo, función de la probabilidad aceptable de que se exceda ac en el período de vida para el que se proyecta la construcción. Toma el valor ρ=1,0 para construcciones de importancia normal, y ρ=1,3 para construcciones de importancia especial.
S: Coeficiente de amplificación del terreno. Depende del coeficiente del terreno, C y del coeficiente adimensional de riesgo, ρ.
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