Efectos de la irregularidad geométrica en planta tipo 1 (Irregularidad Torsional) en la respuesta de edificios en función del análisis estructural empleado : estático, dinámico espectral y dinámico paso a paso en el tiempo.

Abstract

Most seismic design provisions punish buildings with irregular configurations since they have been shown to suffer greater damage in the occurrence of earthquakes. Torsional irregularity occurs when the center of stiffness of a floor does not coincide with its center of mass. This work aims to study the results of the analysis for seismic loads (Static, Dynamic spectral and Dynamic step by step in time) depending on the degree of irregularity. Eight structural models were studied. The first model (Case I) corresponds to regular structural model. The rest of the cases (Case II to Case VIII) consist of the gradual modification of the regular model in order to obtain structural models of various degrees of irregularity. The modification in the irregular structural models consisted of increasing the cantilevered slabs at one end of the structure by 0.50m in each case. The increase in the overhangs allows the center of mass of the floors to be moved without modifying the center of rigidity, thus increasing the degree of irregularity. The results showed that the distribution of the shear force in the columns is dependent on the degree of irregularity, the analysis method used and the position of the column. In addition, it was observed that the static method underestimates the shear in the columns compared to the dynamic analysis methods. Finally, a correction factor was recommended for the static method in order to obtain results close to those obtained in the dynamic methods.