UNA MEDIDA DE INTENSIDAD SÍSMICA BASADA EN UN PARÁMETRO PARA CARACTERIZAR LA FORMA ESPECTRAL DENOMINADO Np
DOI:
https://doi.org/10.18867/ris.86.151Resumen
En este trabajo se analizan diversas medidas de intensidad sísmica (IS) representativas de la forma espectral. En primer lugar, se introduce una nueva medida de IS vectorial basada en la pseudo-aceleración en el periodo fundamental de vibración de la estructura Sa(T1), y un parámetro que caracteriza la forma espectral denominado Np. Se compara la eficiencia del vector <Sa(T1), Np> con diversas medidas de intensidad sísmica mediante el análisis de sistemas de un grado de libertad (S1GL), marcos de concreto reforzado y acero, los cuales se someten a la acción de movimientos sísmicos con distintas características (que incluyen registros cercanos al epicentro y de banda angosta). Se demuestra que el vector propuesto tiene una mejor relación con las demandas máximas y de energía, por lo que su uso reduce las incertidumbres asociadas a la respuesta estructural, que es pieza fundamental en la selección de acelerogramas para el análisis dinámico no-lineal de estructuras, y para evaluar la confiabilidad estructural. Finalmente, se analiza una medida de intensidad sísmica escalar basada en Sa(T1) y Np, y se demuestra que el análisis del peligro sísmico para la medida escalar puede efectuarse mediante herramienta actualmente disponibleDescargas
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