Two-Stage Optimal Design Method for Asymmetric Base-Isolated Structures Subject to Pulse-Type Earthquakes

Asymmetric base-isolated structures subjected to severe torsion may suffer further aggravation of their torsional and translational responses under pulse-type earthquakes. To counteract these detrimental impacts, this study introduces a two-stage optimal design method. The first stage involved the a...

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Bibliographic Details
Published in:Buildings (Basel) Vol. 14; no. 6; p. 1728
Main Authors: Zhang, Jiayu, Qi, Ai, Yang, Mianyue
Format: Journal Article
Language:English
Published: Basel MDPI AG 01.06.2024
Subjects:
Algorithms
Analysis
asymmetric base-isolated structures
Asymmetry
China
Design
Design optimization
Design techniques
Earthquake dampers
Earthquakes
Efficiency
Genetic algorithms
isolator arrangement
Methods
NSGA-II algorithm
pulse-type earthquakes
Seismic activity
Seismology
Structural response
Superstructures
Torsion
Translation
two-stage optimal design method
viscous dampers
Viscous damping
China
ISSN:2075-5309, 2075-5309
Online Access:Get full text
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Summary:Asymmetric base-isolated structures subjected to severe torsion may suffer further aggravation of their torsional and translational responses under pulse-type earthquakes. To counteract these detrimental impacts, this study introduces a two-stage optimal design method. The first stage involved the application of the NSGA-II algorithm for determining an optimal isolator arrangement—namely, position and category—with the objective of reducing both the maximum interstory rotation of the superstructure and the isolation layer. In the second stage, the inclusion of viscous dampers served to minimize the excessive translational response triggered by pulse-type earthquakes. The influence of these dampers’ positions on the structural response was carefully evaluated. The final application of this optimal design method was demonstrated on an asymmetric base-isolated structure. The results indicated a significant reduction in the translational and torsional responses of the asymmetric base-isolated structure when the two-stage optimal design method was utilized, compared to those of structures designed using traditional conceptual methods. It was found that by installing viscous dampers in the isolation layer along both the x and the y directions—specifically, underneath the mass center of the superstructure (CMS)—the effectiveness of the torsional resistance from the first stage could be effectively maintained.
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ISSN:2075-5309
2075-5309
DOI:10.3390/buildings14061728