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Determining Response Quantities in Yielding Structures with Viscous Damping

Rahmatabadi, Payman | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40402 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Khaloo, Alireza
  7. Abstract:
  8. In recent decades, considerable attention has been paid to application of passive energy dissipation systems in design of new buildings as well as in seismic rehabilitation of existing ones. The increased application of these devices in structures will depend on the availability of simplified methods for their analysis and design. In this study, considering high viscously damped single-degree-of-freedom systems, an equivalent linear system with new effective parameters is introduced which has capability to predict maximum displacement and maximum inertia force of the structure simultaneously. Effective mass and effective damping ratio as pair of effective parameters instead of the effective period and effective damping ratio in existing equivalent linear systems are introduced. Through determining optimum points in parameter space, relations for effective linear parameters are proposed. Next, the proposed ELS is modified in a manner to be capable of prediction maximum displacement and maximum restoring force of inelastic system simultaneously. Passing through relations between response quantities in inelastic SDOF system and corresponding elastic system, equations for behavior factor related to ductility, behavior factor related to both ductility and high viscous damping and displacement modification factor have been derived. An equation for estimating yield strength of inelastic system also has been proposed. Evaluation of proposed linear parameters by comparison between results from nonlinear time history analysis and corresponding values computed form proposed relations has been performed which reveals that the linear parameters lead to acceptable error ranges in engineering design purposes. Finally, application of proposed method in different seismic design approaches is explained through various examples, which demonstrates that proposed approach has comprehensive application in earthquake engineering problems.


  9. Keywords:
  10. Seismic Design ; Structural Analysis ; Energy Dissipation ; Reliability ; Viscous Damping ; Performance Based Design ; Equivalent Linear Damping

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