Evaluation of efficiency index of friction energy dissipation devices using endurance time method
Various methods have been presented to improve the performance of buildings against earthquakes. Friction damper device is one of the energy dissipation devices that appropriately absorbs and dissipates the input energy and decreases displacements. In this paper, the possibility of using endurance t...
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K. N. Toosi University of Technology
2020-12-01
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| Series: | Numerical Methods in Civil Engineering |
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| Online Access: | https://nmce.kntu.ac.ir/article_160511_e3fac89fd47b824ed59722eb3de9e244.pdf |
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| author | Amir Shirkhani Bahman Farahmand Azar Mohammad Charkhtab Basim |
| author_facet | Amir Shirkhani Bahman Farahmand Azar Mohammad Charkhtab Basim |
| author_sort | Amir Shirkhani |
| collection | DOAJ |
| description | Various methods have been presented to improve the performance of buildings against earthquakes. Friction damper device is one of the energy dissipation devices that appropriately absorbs and dissipates the input energy and decreases displacements. In this paper, the possibility of using endurance time method to determine the efficiency index and optimum slip load for these dampers was investigated by comparing the results of endurance time and nonlinear time history analyses. The efficiency indexes acquired from the average of results for nonlinear time history and endurance time analyses were close to each other. In this research, by assuming identical optimum slip load for the dampers in all stories, the normalized damper strength was increased in a number of equal steps ranging from zero to one to determine the efficiency index of dampers in each step. Then, the optimum slip load of dampers in the steel frames was calculated according to the minimum efficiency index of dampers. As a result, employing the endurance time method instead of a high number of nonlinear time history analyses is also possible, and using the endurance time method diminishes 57% of computational endeavors. Lastly, a relation for acquiring the optimum slip load of the friction damper devices in steel structures was proposed in terms of the weight of the structures. After adding optimal FDDs to the structures and investigating the effectiveness of the dampers, it was concluded that by using endurance time excitation function with better energy consistency, the endurance time results could be improved. |
| format | Article |
| id | doaj-art-8b8f6845ec6f47e2abd8510a39a7de74 |
| institution | OA Journals |
| issn | 2345-4296 2783-3941 |
| language | English |
| publishDate | 2020-12-01 |
| publisher | K. N. Toosi University of Technology |
| record_format | Article |
| series | Numerical Methods in Civil Engineering |
| spelling | doaj-art-8b8f6845ec6f47e2abd8510a39a7de742025-08-20T01:58:37ZengK. N. Toosi University of TechnologyNumerical Methods in Civil Engineering2345-42962783-39412020-12-0152122010.52547/nmce.5.2.12160511Evaluation of efficiency index of friction energy dissipation devices using endurance time methodAmir Shirkhani0Bahman Farahmand Azar1Mohammad Charkhtab Basim2PhD Candidate, Department of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran.Associate Professor, Department of Structural Engineering, Faculty of Civil Engineering, University of Tabriz, Tabriz, Iran.Assistant Professor, Faculty of Civil Engineering, Sahand University of Technology, Tabriz, Iran.Various methods have been presented to improve the performance of buildings against earthquakes. Friction damper device is one of the energy dissipation devices that appropriately absorbs and dissipates the input energy and decreases displacements. In this paper, the possibility of using endurance time method to determine the efficiency index and optimum slip load for these dampers was investigated by comparing the results of endurance time and nonlinear time history analyses. The efficiency indexes acquired from the average of results for nonlinear time history and endurance time analyses were close to each other. In this research, by assuming identical optimum slip load for the dampers in all stories, the normalized damper strength was increased in a number of equal steps ranging from zero to one to determine the efficiency index of dampers in each step. Then, the optimum slip load of dampers in the steel frames was calculated according to the minimum efficiency index of dampers. As a result, employing the endurance time method instead of a high number of nonlinear time history analyses is also possible, and using the endurance time method diminishes 57% of computational endeavors. Lastly, a relation for acquiring the optimum slip load of the friction damper devices in steel structures was proposed in terms of the weight of the structures. After adding optimal FDDs to the structures and investigating the effectiveness of the dampers, it was concluded that by using endurance time excitation function with better energy consistency, the endurance time results could be improved.https://nmce.kntu.ac.ir/article_160511_e3fac89fd47b824ed59722eb3de9e244.pdfpassive control systemsfriction damper device efficiency indexoptimum slip loadendurance time method |
| spellingShingle | Amir Shirkhani Bahman Farahmand Azar Mohammad Charkhtab Basim Evaluation of efficiency index of friction energy dissipation devices using endurance time method Numerical Methods in Civil Engineering passive control systems friction damper device efficiency index optimum slip load endurance time method |
| title | Evaluation of efficiency index of friction energy dissipation devices using endurance time method |
| title_full | Evaluation of efficiency index of friction energy dissipation devices using endurance time method |
| title_fullStr | Evaluation of efficiency index of friction energy dissipation devices using endurance time method |
| title_full_unstemmed | Evaluation of efficiency index of friction energy dissipation devices using endurance time method |
| title_short | Evaluation of efficiency index of friction energy dissipation devices using endurance time method |
| title_sort | evaluation of efficiency index of friction energy dissipation devices using endurance time method |
| topic | passive control systems friction damper device efficiency index optimum slip load endurance time method |
| url | https://nmce.kntu.ac.ir/article_160511_e3fac89fd47b824ed59722eb3de9e244.pdf |
| work_keys_str_mv | AT amirshirkhani evaluationofefficiencyindexoffrictionenergydissipationdevicesusingendurancetimemethod AT bahmanfarahmandazar evaluationofefficiencyindexoffrictionenergydissipationdevicesusingendurancetimemethod AT mohammadcharkhtabbasim evaluationofefficiencyindexoffrictionenergydissipationdevicesusingendurancetimemethod |