Date(s) - 09/22/2021
12:50 PM - 1:40 PM
Zoom Link: https://ufl.zoom.us/j/93798842230
Development of a Next Generation Base Isolation System for Seismic Hazard Mitigation of Buildings
Speaker: Gustavo Aguilar, EI, Graduate Student, University of Florida
The ideal base isolation system mitigates seismic hazards to maintain structural integrity by dissipating the most amount of earthquake energy possible and thus preventing any building damage from occurring. It must also have self-centering capabilities, which return the structure to its original position allowing normal building operations to resume as soon as possible. To emphasize the importance of self-centering, computer models of a nonlinear single-degree of freedom (SDOF) system with three different control cases – a fixed base (FB) structure, a Banded Rotary Friction Device (BRFD) base isolated structure, and a Self-Centering Banded Rotary Friction Device (SC-BRFD) base isolated structure – were created using HyCoM-3D. Numerical simulations of these models were then conducted using six different historical earthquakes records (three near-field and three far-field) at Design Basis Earthquake (DBE) scale factors to observe their responses. After all numerical simulations, results show that using an SC-BRFD base isolation system returned the nonlinear SDOF structure to its original position every time and reduced the maximum acceleration response by an average of 11.1% for far-field and 7.4% for near-field earthquake records. Furthermore, the SC-BRFD base isolation system reduced the maximum structure deformation by 93.9% for far-field and 96.6% for near-field earthquake records, on average. Lastly, the SC-BRFD base isolation system demonstrated high damping performance while self-centering. These results are reasons to select the SC-BRFD base isolation system for earthquake-prone regions. For experimental validation, real-time hybrid simulation (RTHS) of the physical BRFD and numerical models of a multi-degree of freedom (MDOF) structure and the self-centering mechanism are recommended.
Gustavo received his Bachelor of Science in Civil Engineering (May 2021) from the University of Florida (UF). Currently, he is a graduate student in the structural engineering master’s program (non-thesis) at UF. He will be taking part in a research that studies the effects of wind loads on discontinuous metal roof cladding. Some of his research interest include natural hazard mitigation, performance-based design, structural optimization, and sustainable & resilient infrastructure