Aplicación del ddbd (direct displacement base design) y comparación con el fbd (force base design) en estructuras regulares. (enfocado a evaluar geometría estructural): estructuras de muros acoplados (hasta 4 pisos).

Abstract

Currently, the Force-Based Design or FBD is the most widely used and analyzed structural seismic design methodology for estimate seismic forces. This method proposes a linear analysis for the structural design, obtaining the lateral forces from an acceleration design spectrum, and modifying them by seismic reduction factors. However, this procedure presents important uncertainties and deficiencies related to the calculation of the ductility capacity, the structure stiffness, and its relationship with the resistance. Displacement-Based Direct Design or DDBD, proposed by Priestley, Calvi & Kowalsky, is an alternative to the traditional procedure to solve the FBD deficiencies. This method uses displacements and deformations as basic design criteria and tries the structure to achieve a performance limit state before a given earthquake. In both methodologies, the capacity design principles must be used in parallel to guarantee the formation of plastic hinges in the critical regions of the resistant system elements, in such a way that the dissipate energy, and the structure has an adequate mechanism of plastic deformation. The present document compares these two design alternatives, applying them to a reinforced concrete coupled walls structural typology, which is characterized by providing great stiffness and resistance to structure.