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Random Vibration Analysis for Multi-Story Base Isolated Structures

Mehdizadeh Nasrabadi, Mohammad | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 40679 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Bakhshi, Ali
  7. Abstract:

  8. Earthquake motions are among random excitation loads. For that we used random vibration approach to estimate response of multi-degree of freedom base isolated structures under ground excitation. Some models including linear model ,nonlinear Bouc-Wen and BBW models are studied for modeling the superstructure .Several base isolation models including the laminated rubber bearing, high damping laminated rubber bearing ,resilient-friction base isolator with or without sliding upper plate and the Electricity de France system, are studied . El Centro 1940 and Mexico City 1985 earthquake which preserve the nonstationary evolutions of amplitude and frequency content of ground accelerations are used as seismic acceleration .The method of equivalent linearization in time domain is utilized for obtaining the stochastic equation of motion of the structures. A program is developed in MATLAB environment for solving the iterative differential equations of stochastic response of structures with different models of superstructure and base isolation .The covariance matrix of stochastic response of structures are evaluated. Comparisons of the results with those for the fixed based structure show that the base isolation systems can, in general, be highly effective in reducing the mean square responses of the superstructure.
  9. Keywords:
  10. Random Vibration ; Seismic Isolator ; Earthquake ; Multi-Degree of Freedom Structures

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