Análisis del comportamiento dinámico no-lineal en OpenSees de estructuras con disipadores sísmicos metálicos ranurados-desacoplados”

Abstract

Earthquakes are unpredictable events that may severely affect structures due to variability in their response under conditions such as site, intensity, duration, PGA, among others. High seismic risk countries require more rigorous design and construction of structures. An alternative to improve structural performance is to incorporate structural control systems as seismic dampers. The current thesis research evaluates an alternative to conventional TADAS dampers by adding horizontal slots to their connection plate to decrease the global stiffness of the structure. It allows triangular plate activation according to seismic deformation requirements. The aim is to improve seismic behavior of the structure. Using OpenSees, seventy-two nonlinear dynamic analyses were performed under service, design, and MCE intensities. Four different archetypes were studied (without dampers, including TADAS dampers, and two models including slotted TADAS). The original structure belongs to the ATC 76-1 NIST project. It is an 8-story and 3-bay steel special moment frame. Nonlinear behavior was modeled by concentrating plasticity in hinges and including the modified deterioration theory of Ibarra-Medina-Krawinkler. P-Delta nonlinearity and the gravity system load effects were considered by using the leaning column. By analyzing variables as base shear, story drift ratios, and roof drift, it is concluded that the slotted TADAS proposal has great potential because, in some cases, it improved dynamic response compared to conventional TADAS. Thus, further investigations are proposed by including parametric studies, a greater number of seismic records, other structures, and different activation gaps.