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Seismic Response of Base-Isolated Irregular Steel Structures Equipped with Lead-Rubber Bearing Isolators Considering the Effects of Soil-Structure Interaction


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DOI: https://doi.org/10.15866/irece.v14i6.22871

Abstract


Seismic base isolation isolates the structure from ground motion, consequently increasing the structure's natural period and decreasing its natural frequency. The Lead-Rubber Bearing (LRB) isolator is one of the most desirable systems with a damping mechanism developed to control vibrations and reduce the seismic response of structures under strong earthquakes. This article, considering soil-structure interaction, investigates asymmetric steel structures equipped with seismic elastomeric isolators with LRB. To this end, the behavior of the irregular system under nonlinear time-history dynamic analysis is assessed by numerical modeling using Finite Element (FE) analysis in ABAQUS. The impact of irregularity, the number of structure floors, soil properties, isolation, and foundation stiffness are considered on the response of the structures. 3-, 5-, and 7-story structures with 20% and 40% irregularity are modeled to analyze the effects of irregularity and the number of floors. Models of five-story structures on three types of soft, medium, and hard soil are used to investigate the impacts of Soil-Structure Interaction (SSI). This study demonstrates how the number of floors and the structure's irregularity significantly impact the structure's seismic response regarding displacement and acceleration. The maximum displacement response of the structure's floors also decreases as levels and irregularity increase. A significant impact of soil type on the seismic response of isolated structures is observed when considering the influence of SSI. Additionally, the findings demonstrate that, in both structures with and without isolators on rigid foundations, the effect of the isolator on the structure's dynamic response is negligible.
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Keywords


Nonlinear Time History Analysis; Finite Element Method (FEM); Irregular Steel Structures; Lead-Rubber Bearing (LRB) Isolator; Soil-Structure Interaction (SSI)

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