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Effects of Soil-Pile-Structure Interaction on the Seismic Response of a Bridges

Tamaddoni, Nima | 2014

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 45216 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Ahmadi, Mohammad Mahdi
  7. Abstract:
  8. A large number of structures subjected to the seismic loading have been damaged or have experienced failure in different parts such as the pile structure or even in the entire structure due to unanticipated effects of the soil-pile-structure interaction.The complexity of problems regarding the soil-pile-structure interaction is an influencing factor in prediction of the behavior of structure during the earthquakes. In this study, the effect of the interaction on the dynamic response of bridges was investigated using the finite element software ABAQUS. The primary purpose of this study, as previously described, is to study the effects of the soil-structure interaction on a bridge located on a pile under seismic loading considering the non-linear behavior of materials using the finite element method. In other words, the objectives of this research are: a) constructing the finite element model of the bridge with column-beam structure and the pier as well as the piles and their surrounding soils with the ability to model the kinematic and inertial interactions of an integrated system appropriately.For this purpose, the behavior of the soil materials was assumed to be nonlinear and the separation between the pile and its surrounding soil and also the wave propagation in the soil were considered in the modeling procedure; b)comparing the seismic response and the loads applied to the pier, in the case of rigid base with the fixed support for the column as well as the case of flexible base, considering the interaction effects in the soil environment; and c)reviewing the standard codes in the field of bridge design and investigating the extent of their attention to the issue of soil-pile-structure interaction in the seismic design of the bridge structures.
    For this purpose, the dynamic analysis of a bridge with three spans with column-beam structure was performed using the seismic record of Manjil earthquake in the form of displacement-time history loading and the responses of the structure in different cases were compared with each other. Models were constructed for the case of rigid base with the fixed support for the column as well as the case of flexible base. In the latter case, three different types of the soil with different shear wave velocities were considered.
    Based on the results, the value of the displacements and the structural forces obtained for the case of rigid base were larger than the corresponding amounts for the similar structure placed on the flexible base and the effect of soil-pile-structure interaction led to a significant decrease in the response of the structure Moreover, the forces generated in the model were slightly larger compared to the calculated forces from the standard codes for the seismic design of the bridges
  9. Keywords:
  10. Numerical Modeling ; Dynamic Loading ; Soil-Pile-Structure Interaction ; Kinematics Interaction ; Inertial Interaction

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