Evaluación del desplazamiento máximo de un sistema de aislación en función del ángulo de aplicación del registro sísmico.

Abstract

In this degree work was evaluated a maximum displacement that will be submitted to an isolation system depending on the angle of application of the seismic record by the dynamic record nonlinear (step-by-step analysis over time).For these there were elaborated 3 structural models with 32 isolators. These models have similar characteristics like height, area, weight and vibration period. This allowed to have the same type of seismic isolator of rubber material with non-lineal characteristics in order to be able to evaluate them. The axes defined for the three structural models were 0 degrees for X and 90 degrees for Y. The pairs of records were applied in X, the component (E-O) and in Y the component (N-S), these components were rotated from 0º to 360º every 22.5º with respect to the established axes. The displacements were vectoral calculated by determining the resultant of the absolute maximum displacements in time of the rotated E-O and N-S components. Combination methods such as the 30% rule and SRSS were also applied to evaluate maximum responses. Also, maximum vector displacements were evaluated at each application angle and it was evidenced that the maximum response of an isolation system does not always occur when the record is in the established directions (0º) as is commonly analyzed, otherwise it can be found in a different application angle. Simplified methods help to determine displacements in a faster way but these displacements could be so exaggerated or could be overestimating the real demand for the design.