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Nonlinear Response of Shear-Flexural MDOF Structures Subjected to Seismic Excitations

Dehghan, Navid | 2015

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 47157 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghannad, Mohammad Ali
  7. Abstract:
  8. A generic single-span frame has been used to represent a shear-flexural building and the degree of participation of overall shear and flexural behavior in mode shapes, is controlled by dimensionless parameters of α, δk and δp. By evaluation of modal analysis results, one may conclude the extent to which each parameter affects the dominancy of shear/flexural behavior. By understanding the relation between the abovementioned parameters and proportion of shear/flexural behavior of structures, effects of these parameters and consequently trend of modal shapes on the nonlinear analyses results would be investigated. According to nonlinear analyses results of the flexural structures, ductility increases by height and the maximum ductility occurs at the roof of the structures, while, for the shear structures, first it decreases followed by an increase in values. Therefore, maximum ductility occurs whether at the roof or first floor of structures depending on the fundamental period; additionally, the maximum value is greater than that of the flexural structures. The values of the MDOF modification coefficient of the strength reduction factor (Rm) corresponding to a specified level of target ductility is greater for the flexural structures than that of the shear ones. These values are decreased by increasing the number of the stories of the structure. Finally, for high-rise buildings it is almost independent of target ductility and structure period for considerable range of practical periods
  9. Keywords:
  10. Nonlinear Response ; Multi-Degree of Freedom Structures ; Ductility ; Simplified Multidegree of Freedom (MDOF) ; Strength Reduction Factor ; Shear-Flexural Structures

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