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- Type of Document: M.Sc. Thesis
- Language: Farsi
- Document No: 41490 (09)
- University: Sharif University of Technology
- Department: Civil Engineering
- Advisor(s): Haeri, Mohsen
- Abstract:
- The commercially available finite element software, FLAC, was used to provide better understanding of the static and dynamic behavior of tieback and anchored walls. Many of the codes dealing with the design of these structures use empirical methods to estimate the amount of deformation under static conditions. Therefore, in terms of static behavior, this thesis mainly focuses on the deformation patterns of the wall and the retained soil. Mohr-Coulomb elasto-plastic constitutive model was used; however, in elastic part the nonlinear Duncan-Change was implemented. The efforts made for better representation of soil behavior resulted in the suggestion of a modification to Duncan-Chang’s hyperbolic model. Deformation patterns of wall, as evaluated by numerical model, indicates a cantilever movement above the upper level of tiebacks, lateral bulging between subsequent tieback levels and below the lowest tieback level, a transitional movement and an outward rotation about the wall toe. The effects of various parameters were evaluated on these deformation patterns. The dynamic behavior of these structures is still not very well understood. There are currently not many publications from field or laboratory measurements on the dynamic behavior of these walls. And, the available codes present insufficient and contradictory suggestions for considering the effects of earthquake loading. Therefore, numerical modeling is used to evaluate the available design methodologies and propose better design suggestions. Dynamic investigations suggested that tiebacks may suffer higher axial loads when there is a phase difference between the retained soil and the ground in which tieback bond length is located. An example of such case may involve liquefiable soil behind the wall where the anchor bond lengths are placed in a non-liquefiable soil or rock. This may explain the widespread damage to these structures near shores where liquifiable soils have been present. Other cases, however, showed good performance during strong earthquakes.
- Keywords:
- Numerical Modeling ; Static Behavior ; Dynamic Behavior ; Tieback Walls ; FLAC Software ; Anchored Walls
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