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Numerical Assessment of Bidirectional Roller Bearing Isolators under Near-Fault Earthquakes
Evaluación numérica de aisladores de soportes rodantes bidireccionales sometidos a sismos cercanos a la falla
DOI:
https://doi.org/10.15446/ing.investig.104078Keywords:
base isolation, nonlinear seismic response, supplementary dissipation mechanism, inclination angle (en)aislamiento de base, respuesta sísmica no lineal, mecanismo de disipación suplementario, ángulo de inclinación (es)
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In this research, a bidirectional seismic isolation device composed of sloped bearing plates and multiple rollers arranged in both orthogonal-in-plane directions is numerically studied. A previous analytical model of a single direction of roller bearing (RB) system is extended to a two-direction RB system. Several experimental tests in a physical building model with and without an RB system are used to validate the numerical model. The model is used to perform the nonlinear response of a four-story multi-column building when subjected to pairs of scaled near-fault earthquake records. The effect of the inclination angle of bearing plates in the range of 1.0° to 4.0°, the sliding friction force, and supplementary damping mechanisms ranging from 0.0 to 0.5 N/kg (i.e. friction force normalized with the structure mass) are also investigated. The results show that the proposed bidirectional RB system is suitable for reducing the seismic response of stiff and flexible multi-column structures. In particular, the RB system reduces the acceleration responses by 5% to 85% in flexible structures and 86% to 96% in stiff structures. Furthermore, bearing plates with an inclination angle greater than or equal to 3.0° have significant benefits in terms of self-centering capacity.
En este trabajo de investigación se estudia la efectividad de un sistema de aislamiento sísmico bidireccional compuesto por superficies de rodamiento inclinadas y múltiples rodillos dispuestos en ambas direcciones ortogonales en el plano. Resultados experimentales anteriores de aisladores sísmicos de soportes rodantes unidireccionales y bidireccionales (RB), fueron utilizados para validar un modelo numérico 3D de edificios con RB. Este modelo de comportamiento no lineal se utilizó para obtener la respuesta de un edificio de cuatro pisos sometido a pares de registros escalados de terremotos cercanos a la falla. Este estudio, investiga el efecto del ángulo de inclinación de las superficies rodantes en el rango de 1.0° a 4.0°, la fuerza de fricción por rodamiento y los mecanismos de disipación de energía por deslizamiento, tomando una variación entre 0.0 a 0.5 N/kg en la magnitud de la fuerza de fricción normalizada respecto a la masa de la estructura. Los resultados muestran que el sistema RB propuesto es adecuado para reducir la respuesta sísmica de edificios con comportamiento rígido y flexible. En particular, el sistema RB reduce las respuestas de aceleración entre un 5 % y un 85 % en estructuras flexibles y entre un 86 % y un 96 % en estructuras rígidas. Además, las superficies con un ángulo de inclinación mayor o igual a 3,0° muestran ventajas significativas en relación a la capacidad de auto centrado.
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Copyright (c) 2024 Ricardo González-Olaya, Nelson Andrés Ortiz-Cano, Carlos Andrés Gaviria-Mendoza, Carlos Magluta, Ney Roitman
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