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Evaluation of the Performance of Passive TMDs in Damage Reduction of 2-D Concrete Structures
Abtahi, Pooya | 2010
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- Type of Document: M.Sc. Thesis
- Language: English
- Document No: 41059 (53)
- University: Sharif University of Technology, International Campus, Kish Island
- Department: Science and Engineering
- Advisor(s): Rahimzadeh Rofooei, Fayaz
- Abstract:
- The detuning of the structures equipped with Tuned Mass Dampers (TMDs) caused by their nonlinear behavior under strong ground motions is a real concern in their practical application. This thesis presents a feasibility study on the effectiveness of TMDs in reducing the seismic response and the resulting structural damage of reinforced concrete structures under intense ground motion. A number of 2-D concrete moment resisting frames with different numbers of stories are considered. TMDs are used as a mean to protect these structural models against ground excitation. The mass of TMDs are varied from 1% to 5% of the first effective modal mass of the structural models. IDARC 2-D program is used for the numerical analyses. The Park-Ang damage index of the same program is selected to determine the level of imposed damage to the structural models under earthquake excitation. Various inelastic time history analyses are carried out to assess the level of damage in the considered structural models under different earthquake records. In IDARC 2-D program, the TMD can only be modeled as an additional floor with its own mass, stiffness and damping properties. The preliminary results indicate that depending on the frequency content of the earthquake accelerations, there is not a significant change in the performance of the TMDs due to detuning caused by the nonlinear behavior of the structural systems. Also, as expected, the application of TMDs can in average reduce the inelastic deformation of the structural models in comparison to the case with structures without TMDs
- Keywords:
- Nonlinear Analysis ; Tuned Mass Damper (TMD) ; Structural Failure ; Park-Ang Damage Index
Digital Object List-
محتواي پايان نامه - view
Bookmark- Two tuned liquid column dampers "TLCDs," each made up of a four-storey high, 50,000 gallon water tank lengthened nearly the full width of the tower, were implemented at the top of the building. The system not only solved the structural challenges but ...
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- Fig 2-9: TLCD that Used in Rincon Hill (the First U.S. Residential Tower) [3]
- Each TLCD has a broad horizontal chamber at the bottom with a column of water at each end. The dampers work by allowing the water to move back and forward along the bottom chamber of the tank and up into the columns [3].