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Comparison Of Operation Of Metal Dampers In Steel Structures Based On Endurance Time Method

Mirjalili, Amir | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45696 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayun
  7. Abstract:
  8. Based on special properties of metal dampers such as high energy dissipation, stable hysteric cycles and simple application, low cost, insensitivity to changes of temperature and ability to be substituted after occurring of earthquakes, they are being used for structures control. ADAS and SSD are two kinds of metal dampers which are connected to top of the chevron braces and under the middle of beams. When shear forces are applied, these dampers yield and enter the plastic zone. In Endurance Time (ET) method gradually intensifying acceleration functions are created in a manner that the linear and nonlinear response spectra of them, while being proportional to average of real earthquakes spectra, intensifies in a uniform manner with time. These functions are used as input functions for nonlinear time history analysis of structures and performance of structures is assessed based on the maximum time duration that they can meet the specified performance objectives. In this paper, application of the ET method in nonlinear seismic analysis of structures with metal dampers has been investigated. High speed of nonlinear dynamic analysis and ability to being matched with primary concepts of performance base design codes are the most important features of this method. A set of three acceleration functions have been applied to steel frames and the results of analysis are compared to the results of time history analyses. ET results of different frames approved that this method can be a good instrument to estimate IDA results with reasonably good accuracy using a few number of time history analyses. It is proved that this method can be used in nonlinear analysis of structures as a powerful tool. In order to design the buildings and dampers, the newest performance base design has been used. Based on good practicality of the Opensees to control inputs and outputs such as geometry model and loading, and also ability to be adapted with other programs for instance MATLAB, it has been used for frequent analysis
  9. Keywords:
  10. Metallic Damper ; Modeling ; Nonlinear Dynamic Analysis ; Rehabilitation ; Endurance Time Method ; OpenSees Software ; Hysteresis Energy Dissipation

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