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Nonlinear Quantification and Seismic Evaluation of EBF Disposal Systems in Mid-story Structures

Hooshmandi, Matin | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 48359 (53)
  4. University: Sharif University of Technology, International Campus, Kish Island
  5. Department: Science and Engineering
  6. Advisor(s): Mofid, Masoud
  7. Abstract:
  8. In the present study it was intended to evaluate the seismic performance of multi-story EBF structures for designing. When adopting this method, parametric studies are carried out based on the nonlinear performance of such systems whiting the framework of nonlinear static and dynamic analyses. In lines with seismic strengthening of such structures, this study tries to reassess the performance of these systems through increasing ductility and replacing bracing frames with energy damper and special seismic systems. As a result, a fuse type performance is created to protect the other elements of the structure. This study describes the seismic strengthening of this type of dampers using simple analytic models including transverse seismic responses of such systems based on the concepts of dynamic analysis and previous studies. Thoroughly investigating the history of the conducted studies on seismic performance of such systems and conducting the IDA analysis to extract design failure curves, we try to have a correct estimation of the seismic behavior evaluation parameters of these structures (behavior coefficient, ductility) in order to calculate the damage index of the structures if possible. Regarding Eccentrically Braced Frame (EBF), the models for nonlinear limited parts are presented in both shear and bending yielding, and then their capability are investigated. In order to determine the nonlinear behavior of these systems, the final stiffness and strength of the dampers are obtained using all involving parameters in the frame of dimensionless parameters. Conducting numerous static, elastic and non-elastic analyses, a new algorithm is obtained to determine the amount of energy absorption and evaluate the damage index of the system; moreover, the IDA analysis is done and system failure curves are compared, having various geometries and details. In the end, the obtained results are used to verify the capabilities of these new strengthened systems to improve their function, which can ultimately lead to an appropriate designing method
  9. Keywords:
  10. Nonlinear Static Analysis ; Nonlinear Dynamic Analysis ; Fracture Curve ; Seismic Assessment ; Performance-Based Earthquake Assessment ; Eccentrically Braced Frame (EBF) ; Ductile Diaphragm

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