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Performance-Based Design of Steel Structures with Metallic damper Using Endurance Time Method

Yousefian Moghadam, Sina | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 44418 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoun
  7. Abstract:
  8. Preventing critical damages to structures and hence saving the lives and money is an inevitable work which a designer has to do. During the earthquake, huge amount of energy applies to the structure and finding a way to reduce transfer of this energy to main structure is crucial. For this purpose, Structural Control systems may be used. Metallic Dampers are one of those systems which absorb the earthquake input energy by having nonlinear deformations. In this Thesis, one type of this dampers which is innovated by Estekanchi, have been studied .Indeed, this damper is a connection between bracing and main frame. In this damper a U shape part acts as a sacrificing portion and absorbs energy by yielding under bending moments which is developed in its section as result of relative displacement between two ends of bracing. In this research, firstly this damper is modeled analytically and its important characteristics such as hysteretic loops and stress and strain distribution on it are determined. After that, the effect of changing the dimensions and thicknesses of that model on the main parameters of the system, including yield force, initial stiffness, hardening stiffness and amount of absorbed energy in each cycle is studied. Second part of this research, is focused on utilizing this damping system on steel structures which have some weaknesses in their design and aimed to rehabilitate them and investigate their performance before and after rehabilitation. In this way, Endurance-Time method is used for analysis of the structures. This method consist of excitations that have increasing accelerograms, which their different endurances indicate various intensities of earthquakes in different hazard levels which leads to reduce significantly the time of analysis. Since analysis of structure for different levels is performed by one excitation. Finally, optimum arrangement of dampers is determined for each structure and performance of the structure in different performance levels is evaluated based on drifts and element damages before and after rehabilitation. All of the structures have acceptable performances. Moreover, response of structures is controlled by ordinary time history analysis with selected FEMA-P695 records and Comparison of results with Endurance-Time method shows the reliability of this approach. In this research, performance criteria are based on ASCE-41-06
  9. Keywords:
  10. Metallic Damper ; Endurance Time Method ; Structural Control ; Seismic Rehabilitation

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