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Numerical and Parametric Investigation of Several Novel Cable Damper Braces

Eftekhari, Mobin | 2022

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 55859 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Maleki, Shervin
  7. Abstract:
  8. In this study, several novel cable-pipe damper brace (CPDB) systems are introduced. The CPDBs consist of steel cables wrapped around supporting pipes and arranged as cross-bracing in steel frames. The arrangements are such that the cables are always in tension when a lateral load is applied to the steel frames. The wrapping of cables around pipes makes the systems act like a friction damper in a seismic event. In addition, the possibility of energy dissipation by plastic pipe deformation and yielding of cables is investigated. Each system is analyzed by nonlinear finite element method to investigate its lateral strength and cyclic behavior. The primary results of this study showed that some of the systems had significant lateral resistance and energy dissipation capability. The proposed systems exhibited stable cyclic behavior without pinching, similar to the behavior of friction dampers. Furthermore, an extensive parametric study was carried out on selected systems to determine the effect of every possible critical parameter on their responses. The results of the parametric study showed that most of the considered parameters had remarkable impacts on responses. The existence of various effective parameters in the proposed systems provides a wide range of lateral resistance and energy dissipation capabilities suitable for all types of structures. The results indicated that the cables always remained elastic during lateral displacements of the frames. This means changing cables and pipes after earthquakes is not necessary. In addition, the proposed systems are lightweight, easy to build, and economical. All these features make the introduced cable systems ideal for applications in seismic design and retrofitting of structures
  9. Keywords:
  10. Friction Damper ; Pipe Damper ; Steel Structures ; Hysteresis Curve ; Earthquake Resistance ; X-Bracing

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