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Performance Based Analysis of Steel Bridges with Telescopic Dampers

Poorabdollah, Hossein | 2021

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 54038 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Eskandari, Morteza
  7. Abstract:
  8. The main purpose of this study is Performance Based Analysis of steel bridges equipped with Telescopic Dampers and also to design a suitable damper in order to improve the behavior of the structural system and, consequently, reduce the damage to the structure after the earthquake. Different models of dampers such as Buckling Restrained Braces (BRB’s), Hydraulic Dampers, Viscous Dampers, Shear Panel Dampers, Visco-Elastic Dampers, etc., are used according to their specifications along with Laminated Rubber Bearings (LRB’s) to control the structural behavior of bridge, reduce deck displacement and base shear. The result of this project is the design of a special type of telescopic dampers, which is presented according to the specifications and response of the desired bridge. In this type of damper, shear-lead switches are used, which due to their telescopic behavior are able to withstand large deformations and also due to the resistance of lead metal to fatigue, it has a good performance under oscillating loads such as earthquake. This is classified as Performance-Based Design in Structural and Earthquake Engineering. To model the structure, which is a three-span steel deck bridge equipped with Telescopic Lead Yielding Dampers (TLYD’s), the OpenSees finite element software has been used. For a more accurate design of the damper, three earthquake records are applied to the model and the maximum value is considered among the responses. Finally, the parameters related to the telescopic damper, including stiffness and yield strength, are determined and calculated according to the behavior of the bridge in such a way that the structural responses such as deck displacement and base shear are in the best possible state. In other words, a large amount of seismic energy is absorbed by the damper and the damages are concentrated in this part. In this way, the damages of the main structure will be controlled and consequently the losses caused by the earthquake will be reduced
  9. Keywords:
  10. Performance Based Design ; Telescopic Damper ; Metallic Yield Damper ; Steel Deck ; Steel Deck Bridge

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