DISEÑO ÓPTIMO INELÁSTICO DE MARCOS DE CONCRETO REFORZADO CON CONTRAVIENTOS RESTRINGIDOS CONTRA PANDEO
DOI:
https://doi.org/10.18867/ris.111.640Palabras clave:
diseño multi-objetivo, optimización, costo, índice de dañoResumen
Investigaciones recientes han demostrado el potencial de los métodos de optimización en el diseño sísmico de edificios. Al día de hoy, estos estudios se enfocan en obtener un conjunto de estructuras óptimas en términos de costo, peso, desempeño sísmico, daño, impacto ambiental, entre otros. Por otro lado, el uso de contravientos restringidos contra pandeo (CRP) ha ganado popularidad debido a su notable aporte en la disipación de energía sísmica. Por lo anterior, en este trabajo se presenta el diseño multi-objetivo de sistemas duales compuestos por marcos de concreto reforzado con CRP. El procedimiento se basa en la técnica de optimización Non-Dominated Sorting Genetic Algorithm (NSGA-II) y dos funciones objetivo: minimizar el costo inicial y maximizar el desempeño sísmico. Para evaluar el desempeño sísmico se calcula la distorsión máxima de entrepiso promedio de la estructura mediante análisis dinámicos no-lineales bajo la acción de ocho registros sísmicos de suelo blando. Además, el índice de daño local promedio de Park y Ang se considera como función de penalización. La metodología se aplicó a dos edificios de 9 y 12 niveles considerando las columnas, trabes y CRP como variables del problema. Los resultados demuestran la eficiencia de la aplicación de NSGA-II en el diseño sísmico inelástico de sistemas duales para conseguir conjuntos de diseños económicos, ligeros y seguros de forma rápida y eficaz.
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