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Effect of Bi-directional Ground Motion on the Response of Base-Isolated Structures with U-Shaped Steel Damper
Current design practices for base-isolated structures generally conduct in plane time-history analysis using a single horizontal seismic component of the ground motion. However, base-isolated structures are subjected to bi-directional horizontal ground motion. So, some error included in the evaluation of the maximum displacement of the seismic isolation layer and damage to the dampers during an earthquake. This research focuses on the damage on U-shaped steel dampers, widely used in Japan as seismic isolation devices.
A quantitative comparison between the damage on damper obtained using: (1) a one-directional (1D) model (SDOF system with single seismic component), and (2) a bidirectional (2D) model (Multiple Shear Springs with 2DOFs and both seismic components) is conducted. From analytical results, damage on damper up to fracture were compared. Then, the safety factor that should be considered in the current design based on 1D analysis was examined. Moreover, the values of the maximum displacement of the isolation layer were also compared and the safety factor that should be considered in the current design method was also examined.
Effect of Bi-directional Ground Motion on the Response of Base-Isolated Structures with U-Shaped Steel Damper
Current design practices for base-isolated structures generally conduct in plane time-history analysis using a single horizontal seismic component of the ground motion. However, base-isolated structures are subjected to bi-directional horizontal ground motion. So, some error included in the evaluation of the maximum displacement of the seismic isolation layer and damage to the dampers during an earthquake. This research focuses on the damage on U-shaped steel dampers, widely used in Japan as seismic isolation devices.
A quantitative comparison between the damage on damper obtained using: (1) a one-directional (1D) model (SDOF system with single seismic component), and (2) a bidirectional (2D) model (Multiple Shear Springs with 2DOFs and both seismic components) is conducted. From analytical results, damage on damper up to fracture were compared. Then, the safety factor that should be considered in the current design based on 1D analysis was examined. Moreover, the values of the maximum displacement of the isolation layer were also compared and the safety factor that should be considered in the current design method was also examined.
Effect of Bi-directional Ground Motion on the Response of Base-Isolated Structures with U-Shaped Steel Damper
Lecture Notes in Civil Engineering
Varum, Humberto (Herausgeber:in) / Benavent-Climent, Amadeo (Herausgeber:in) / Mollaioli, Fabrizio (Herausgeber:in) / Yamada, Satoshi (Autor:in) / Kishiki, Shoichi (Autor:in) / Jiao, Yu (Autor:in)
International Workshop on Energy-Based Seismic Engineering ; 2023 ; Porto, Portugal
24.06.2023
11 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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