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Response Control of Base-Isolated Structures Using Tuned-Mass Dampers—A Numerical Study
Base isolation system (BIS) typically consists of a laminated rubber bearing or sliding elements with low horizontal stiffness. They can reduce the acceleration of structures by allowing inter-layer displacement of the isolation system. However, its low horizontal stiffness makes them vulnerable to large lateral displacement that in turn affects the seismic performance of structural systems negatively, especially under long period ground motions. Also, such large amplitude will damage the plumbing and other service lines which poses several functional issues. Introduction of highly damped isolators or additional dampers to reduce these large base isolation displacement causes increase of accelerations and inter-storey drift response of the main structure. Introduction of a tuned-mass damper (TMD) on the isolation floor is an effective scheme to reduce the aforementioned unfavourable base isolation displacements. The maximum relative displacement at the isolation level justifies the reason for introducing the TMD at the isolation floor in a base-isolated structure. The present investigation is on the effectiveness of a TMD in the form of a vertical cantilever with a tip mass in reducing the isolation displacement. It also presents a few parametric studies which will provide insight into better system design.
Response Control of Base-Isolated Structures Using Tuned-Mass Dampers—A Numerical Study
Base isolation system (BIS) typically consists of a laminated rubber bearing or sliding elements with low horizontal stiffness. They can reduce the acceleration of structures by allowing inter-layer displacement of the isolation system. However, its low horizontal stiffness makes them vulnerable to large lateral displacement that in turn affects the seismic performance of structural systems negatively, especially under long period ground motions. Also, such large amplitude will damage the plumbing and other service lines which poses several functional issues. Introduction of highly damped isolators or additional dampers to reduce these large base isolation displacement causes increase of accelerations and inter-storey drift response of the main structure. Introduction of a tuned-mass damper (TMD) on the isolation floor is an effective scheme to reduce the aforementioned unfavourable base isolation displacements. The maximum relative displacement at the isolation level justifies the reason for introducing the TMD at the isolation floor in a base-isolated structure. The present investigation is on the effectiveness of a TMD in the form of a vertical cantilever with a tip mass in reducing the isolation displacement. It also presents a few parametric studies which will provide insight into better system design.
Response Control of Base-Isolated Structures Using Tuned-Mass Dampers—A Numerical Study
Lecture Notes in Civil Engineering
Saha, Suman (editor) / Sajith, A. S. (editor) / Sahoo, Dipti Ranjan (editor) / Sarkar, Pradip (editor) / Azeem, M. (author) / Sajith, A. S. (author) / Indira, P. V. (author)
2022-10-05
11 pages
Article/Chapter (Book)
Electronic Resource
English
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