Aplicación del ddbd (direct displacement base design) y comparación con el fbd (force based design) en estructuras regulares: estructuras duales de muros y pórticos de hormigón armado (de 5 a 20 pisos).

Abstract

The present work of curricular integration aims to make a comparison between the force based design method FBD (Force Based Design), and the displacement based design method DDBD (Direct Displacement Base Design), applied to dual structures of reinforced concrete walls and frames. The purpose of this project is to show the shortcomings of the force-based design method and the differences it presents in comparison to displacement-based design, both in structural design procedure and in results of basal shear, external actions applied to the structure, drifts, displacements, end sections of structural elements and required reinforcing steel. In order to perform a detailed comparative analysis, the structural design process using each of the methodologies is presented, which can be applied to typical geometries of 5 to 20-story structures. A fundamental problem with force-based design is the selection of the appropriate stiffness of the members, since assumptions must be made about the sizes of the elements before determining the seismic forces. Starting from the sections calculated as pre-dimensioning, the displacement-based design described by (Priestley, Calvi, & Kowalsky, 2007) is performed, which proposes a procedure that consists of converting a structure that has several degrees of freedom into an equivalent system of one degree of freedom by means of a displacement profile of the initial structure, which is determined by a limit state of performance that depends on the geometry of the structure and the properties of the materials that compose it. As long as these do not exceed the limits established by the Ecuadorian regulation that establishes a maximum inelastic drift of 0.02.