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Investigating the Performance of Tuned Mass Dampers in Controlling the Nonlinear Behavior of 3-D Structural Models Considering Soil-Structure Interaction By

Kenarangi, Hadi | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40547 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Rahimzadeh Rofooei, Fayyaz
  7. Abstract:
  8. Reducing the seismic response of structures under dynamic loads has been highly considered by many researchers in the past few decades. Among them, Tuned Mass Dampers (TMD) have been studied extensively and used as a mean to control the response of structures under earthquake and wind loadings. In the majority of these studies, it is assumed that the structural models are located on rigid base and only their linear response has been considered. Soil-Structure Interaction (SSI) and nonlinear response of structures could have significant effect on the dynamic characteristics of structures that could results in detuning of TMDs. In this study, a number of 3-D nonlinear steel structural models with various number of floors and different levels of eccentricities are considered to investigate the performance of TMDs in controlling the seismic response of nonlinear buildings taking into account the SSI effect. The passive control system consisting of TMDs with optimal parameters have been considered at top floor of buildings along two orthogonal directions. A discrete model based on the concept of Cone Models has been used for modeling the effect of SSI. Also, the shear wave velocity of soil is varied from 100m/s to very large values to represent different soil types. The structural models are excited by a number of bi-directional horizontal ground motions according to the soil type. This study consists of two major parts which the first one is about searching for optimum location of TMDs in the plan of the building. The second part is focused on investigating the effect of SSI on the performance of TMDs. Story shear forces and drift ratios are considered as a measure for comparison. The OpenSees software is used for the nonlinear time history analysis. Results show that the nonlinear response and SSI have a decreasing effect on the performance of TMDs and this effect amplifies as the shear wave velocity of underlying soil decreases
  9. Keywords:
  10. Soil-Structure Interaction ; Nonlinear Behavior ; Tuned Mass Damper (TMD) ; Three Dimensional Structural Models

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