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A Study on the Effect of Foundation Uplift on Response of Soil-Structure Systems Using Endurance Time Method

Eshraghi Arani, Marzie | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 46897 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ghannad, Mohammad Ali; Esmaeil Pourestekanchi, Homayun
  7. Abstract:
  8. In recent decades, the soil-structure effect has been considered in seismic studies. Most of these researches are based on the premise that the foundation is bonded to the ground. However, several examples of structures that experienced uplift have been reported. Uplift affects the soil-structure contribution and nonlinear behavior of the structure. It seems that a parametric study should be done for the simultaneous effects of the soil-structure interaction, foundation uplift and inelastic behavior of the superstructure. Although the most accurate methods to estimate the behavior of structures is the nonlinear time history analysis, this analysis is very time consuming. The endurance time method is an accurate method based on the time history analysis. Compared to the time history, the structure is supposed to only one acceleration function in this method. This function increase with time passing. This leads to decrease in calculations and save time. In this research, firstly, the performance of the endurance time method to analyzing soil-structure systems allowed to uplift has been investigated. The study shows that the endurance time method results in responses with appropriate accuracy. In the second step, it is attempted to determine the effect of uplift on the ductility demand of structure. It is observed that generally, ductility demand in the structure allowed to uplift decreases compared to the structure not allowed. The effects of this phenomenon commonly increase with soil softening with respect to the structure and an increase in dimensional ratio. In the structures with less nonlinear behavior, uplift has much more considerable effects
  9. Keywords:
  10. Endurance Time Method ; Time History Analysis ; Nonlinear Behavior ; Ductility ; Soil-Structure Interaction ; Foundation Uplift ; Inelastic Behavior

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