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Characterizing Effective Supplemental Damping Properties to Estimate the Seismic Response of Non-Proportionally Damped Two-Way Asymmetrical Buildings
Building codes stipulate that design response spectra can be reduced when the damping ratio of the concerned building exceeds 5%. To reduce the 5%-damped design response spectrum, it is necessary to quantify the effective damping of non-proportionally damped buildings. It is recognized that not only the resultant damping but also the distribution characteristic of viscous dampers across the floors of a building affects the seismic response of asymmetric-plan buildings. For this reason, this study proposes a method to characterize the effective damping properties of non-proportionally damped two-way asymmetric-plan buildings. The proposed method involves constructing a non-proportionally damped three-degree-of-freedom (3DOF) oscillator in modal space. This modal oscillator reflects the characteristic of the dominant mode in each of the three directions of the two-way asymmetric-plan building. By mapping the seismic response of the 3DOF oscillator into physical space, the seismic response of a 20-story example building was satisfactorily estimated. This study also examines the effectiveness of using code-stipulated effective damping in estimating the seismic response of the example building.
Characterizing Effective Supplemental Damping Properties to Estimate the Seismic Response of Non-Proportionally Damped Two-Way Asymmetrical Buildings
Building codes stipulate that design response spectra can be reduced when the damping ratio of the concerned building exceeds 5%. To reduce the 5%-damped design response spectrum, it is necessary to quantify the effective damping of non-proportionally damped buildings. It is recognized that not only the resultant damping but also the distribution characteristic of viscous dampers across the floors of a building affects the seismic response of asymmetric-plan buildings. For this reason, this study proposes a method to characterize the effective damping properties of non-proportionally damped two-way asymmetric-plan buildings. The proposed method involves constructing a non-proportionally damped three-degree-of-freedom (3DOF) oscillator in modal space. This modal oscillator reflects the characteristic of the dominant mode in each of the three directions of the two-way asymmetric-plan building. By mapping the seismic response of the 3DOF oscillator into physical space, the seismic response of a 20-story example building was satisfactorily estimated. This study also examines the effectiveness of using code-stipulated effective damping in estimating the seismic response of the example building.
Characterizing Effective Supplemental Damping Properties to Estimate the Seismic Response of Non-Proportionally Damped Two-Way Asymmetrical Buildings
Lin, Jui-Liang (author)
Journal of Earthquake Engineering ; 29 ; 734-754
2025-02-17
21 pages
Article (Journal)
Electronic Resource
English
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