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Investigation of the Influence of Strong-Motion Duration on Endurance Time Analysis

Mashayekhi, Mohammad Reza | 2012

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 43178 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Esmaeil Pourestekanchi, Homayoon
  7. Abstract:
  8. Endurance Time Method (ET) is a dynamic analysis in which structures are subjected to intensifying accelerograms and performance of them are assessed based on their response at different excitation levels. Duration consistency of current ET accelerograms has not been directly considered. Strong motion duration can strongly influence the response of structures and foundations especially when they encounter degrading characteristics in their materials. In this study, duration related properties of ET accelerograms and ground motions are compared. These properties consist of strong motion duration, cycles number of motion and number of nonlinear cycles which a structure should sustain when it is subjected to a motion. Throughout this thesis, different target times in which duration consistency are guaranteed, are determined. In order to quantify the number nonlinear cycles for a structure, the new definition is proposed in this thesis. Afterwards, the influence of number of nonlinear cycles in response of structures, is investigated. It is concluded that this parameter does not directly affect the response of structures. The parameter that is combination of hysteretic energy and the number of nonlinear cycles is proposed to be a good predictor of strong motion duration influence of a ground motion. Also, the effectiveness of this parameter in nonlinear dynamic analysis of framed moment resisting concrete frames, is investigated. To sum up, results of ET analysis and nonlinear time history analysis of ground motions, are compared based on accuracy of results and compatibility of the proposed parameters
  9. Keywords:
  10. Hysteresis Energy ; Moment Resisting Rainforced Concrete Frame ; Concrete Structures ; Endurance Time Method ; Strong Motion Duration ; Equivalant Cycle Number ; Nonlinear Cycles Number

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