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On the Performance of Passive TMDs in Damage Reduction of 2-D Concrete Structures, Considering Soil - Structure Interaction

Soltanpour, Jafar | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 47106 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Application of passive control systems in reducing the seismic induced forces on different structures has attracted the attention of many engineers and researchers during the last few decades. Various damping systems have been introduced in this regard, and many of them have practically been implemented in different buildings. Tuned Mass Dampers (TMD) are certain types of passive control systems that can effectively reduce the dynamic response of tall buildings under various types of dynamic forces. More specifically, extensive researches have been carried out on the application of TMDs on suppressing the seismic response of tall buildings in recent years. In this regard, the soil-structure interaction (SSI) is one of the main concerns in designing the TMD equipped structures located on soft soils due to its effect on the fundamental vibrational frequency of the structural systems. This thesis investigates the effectiveness of TMDs in reducing the seismic response as well as the induced structural damage of reinforced concrete structures considering the SSI. A number of 2-D concrete moment resisting frames structures with 4, 8 and 12 stories are considered. The structural models were designed considering soil type II and were checked to satisfy the requirements for soil type III. In the next step, a frame of each structural model, was transferred to IDARC program and the effect of SSI was considered using the equivalent damping and fundamental period of those models extracted from the ASCE 7, 2010 Code. Finally, TMDs were designed and added to the top floor of the prepared structural models. The TMD masses were considered as 0.02 of the first effective modal mass of the structural models. In terms of mathematical modeling, the TMD can be considered as an additional story with its own mass, stiffness and damping properties. Using 8 earthquake records scaled to different levels of PGAs, the nonlinear response of the structural models was determined. The built-in Park and Ang damage index in IDARC program was used to study the resulting structural damages under different earthquake records. In general terms it can be concluded that the effect of SSI is more significant when using soil type III. Also, the TMDs perform more efficiently on taller structures. Investigating the damage index shows that by increasing the intensity of input ground motion, the effect of SSI becomes more dominant and also the performance of TMD in reducing the overall damage ratios and absolute acceleration increases
  9. Keywords:
  10. Soil-Structure Interaction ; Damage Reduction ; Two Dimensional Model ; Passive Tuned Mass Damper (PTMD) ; Two Dimentional Concrete Structure

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