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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 39472 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Haeri, Mohsen
- Abstract:
- Loads from laterally spreading ground have been a major cause of damages to pile foundations in past earthquakes. Analysis of case histories have shown that damages are particularly intense when a nonliquefiable surface crust layer spreads laterally over underling liquefied layers. In this research the effect of lateral spreading due to liquefaction on single piles embede in a gently sloping ground has been investigated. Finite element method using OpenSees is used to model the pile and embedded soil. The soil profile for all models consisted of a nonliquefiable crust layer overlying loose sand with Dr = 30-35% overlying dense sand with Dr = 70-80%. The effect of geometric properties such as the crust and liquefiable layer thickness and the ground slope on the pile dynamic response has been studied. The results of analysis show that the liquefiable layer thickness is the most important factor on the pile behavior in the dynamic analysis. By increasing the liquefiable layer thickness, pile displacement and bending moments on the pile increase. Pile stiffness is another important parameter in the studies. To investigate the effect of this parameter piles with different diameters have been modeled. Results show that by increasing the pile stiffness pile deformation decreases and internal forces developed in pile increase. In order to verify the numerical simulation, results of some centrifuge tests is utilized and good agreement has been observed between the experimental and numerical results
- Keywords:
- Liquefaction ; Lateral Spread ; Pile Displacement ; Pile Bending Moment
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