Aplicación del ddbd (direct displacement based design) y comparación con el fbd (force based design) en estructuras regulares. (enfocado a evaluar geometría estructural): estructuras de muros en cantilever de hormigón armado (5 a 20 pisos).

Abstract

In seismic engineering there is a variety of analysis methods and procedures that allow evaluating the performance and affectation of a structural system against seismic loads, among these, force-based design (FBD) stands out. The FBD procedure is based on the determination of the shear force at the structure’s base using the design acceleration spectrum and the expected elastic period of the structure. Its application is not exempt from uncertainties, from the initial stiffness estimate to the seismic resistance reduction through factors that vary depending on the design codes and that assume the same level of ductility for all structures of the same type. Due to the deficiencies related to force-based design, new procedures have been developed, whose objective is to provide adequate displacement solutions to seismic engineering problems. In this way, the Direct Displacement-Based Design (DDBD) is presented, proposed by Priestley, Calvi & Kowalski (2007), where the seismic force is determined by defining a design displacement, which can be associated to different limit states or restricted by design codes. On the other hand, stiffness is no longer a design variable and is calculated as a result of this procedure.