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Numerical Analysis of Buried Pipelines in Soil Slopes Subjected to Dynamic Loadings

Seyed Joodat, Hanie | 2013

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45200 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Jafarzadeh, Fardin
  7. Abstract:
  8. In this study, the seismic response analysis of a buried pipeline had been performed using three-dimensional (3D) dynamic analysis of the soil-pipeline interaction under different loading inputs. A number of parameters such as properties of the buried pipeline including diameter and internal pressure and different loading frequencies were used for this investigation. The pipe was considered as an elastoplastic material and a nonlinear elastic material based on the Mohr–Coulomb criterion was used to model the soil behavior. In addition, pipe-soil interaction has been studied in both tangential and vertical directions. The ABAQUS software was utilized for the 3D numerical modeling and earthquake response analysis of a buried pipeline in the slope structure. A comparative study has been performed to obtain the deformation of the buried pipeline, the relative displacement of the pipeline and the soil, and the strain performance of the soil-pipeline system in the slope structure. The results revealed that for a specific frequency, the soil slope is the dominant factor controlling the amount and direction of displacements induced in the buried pipes. This phenomenon was inferred from the results of 8 models with different frequencies, 5 models with different pipe diameters, 2 models with different pipe internal pressures and 2 models with different pipe angles. As the frequency of the loading increased, except for the frequency close to the natural frequency of the system, the displacements of the slope as well as the buried pipes decreased. Moreover, in the case of the lower frequencies, the most critical place for buried pipes was the middle part of the slope. However, the displacement of the pipes was independent of the burial place in higher frequencies. Furthermore, the effect of the pipe diameter, the internal pressure and pipe angle on deflections was negligible for both the slope and the buried pipe
  9. Keywords:
  10. Dynamic Analysis ; Soil-Pipe Interaction ; Buried Pipline ; Frequencies ; ABAQUS Software ; Finite Element Method ; Pipelines

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