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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 41870 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Ahmadi, Mohammad Mehdi
- Abstract:
- In safe and economic designing of deep foundations for any structure, there are several factors affecting the behavior and response of a pile under seismic loads. These factors can be divided into three main categories: geometrical factors (e.g. Dimensions of the pile, soil, and mesh scheme), material properties (e.g. shear modulus, bulk modulus, soil elasticity, soil density, and shear strength) and earthquake load characteristics (e.g. frequency range, PGA, duration of excitation(. Studying the effects and importance of these factors in the final response of the pile (i.e. ultimate forces and displacements ) can help the design engineers of these foundations to optimize their designs. given the importance of the subject and the possibility of using numerical methods and computer technology to evaluate the behavior of piles, this research attempts to use finite difference numerical method and case study of single piles to analyze their behavior under seismic loads and determine the effects of different factors in their response. The software used in this study is FLAC 3D version 3.00-261.
The results of the model were compared with the results of experimental and numerical tests, carried out by practitioners and engineers before. Studying these results indicates a very good compatibility of response of the model and the experiments. In particular, maximum developed moment on pile head and maximum deflection of the pile head, coincides with the ones obtained by other scientists and engineers.
After the model verification, the effects of some pile and soil parameters were discussed. The goal was to determine the effects of different factors in pile response qualitatively. According to other engineers recommendations, pile/soil stiffness ratio (ratio of modules of elasticity), pile diameter and the pile length were selected to be tested. Effects of these parameters on the amount of deflections and the moment created and distributed over the structure of the pile were separately investigated.
Obtained results showed that in case of higher pile/soil stiffness ratio (i.e. softer soils or stiffer piles), higher moments will be developed in pile. However the displacements of the pile head will be decreased. This will directly affect the optimized design of piles - Keywords:
- Soil-Pile Interaction ; Numerical Analysis ; FLAC Software ; Pile Seismic Response
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