Thesis
Parameter study to assess 3D geometric effects on bridge foundation response resulting from liquefaction-induced lateral spreading demands
Washington State University
Master of Science (MS), Washington State University
2017
Handle:
https://hdl.handle.net/2376/102504
Abstract
For designing bridge foundations in seismic regions, especially the foundations near the embankment, the magnitude of forces engaged by the foundations due to liquefaction-induced lateral spreading and pile pinning become important aspects. Bridge foundation design procedures based on two-dimensional pile pinning concept adequately account for the forces on the bridge foundation, but do not offer much guidance on the expected foundation pinning due to three dimensional aspect of the problem. This study is to identify the critical site geometry features that lead to reductions in foundation demands due to the 3D effect and to analyze the relative demands on the foundation considering the three-dimensionality of a site as compared to a plane strain analysis. These objectives are accomplished by analyzing two hundred 3D finite element models of the soil-foundation system using OpenSees software. The parameter study considers different combinations of bridge approach embankment width, crust thickness, liquefiable layer thickness, and foundation stiffness. This study indicates that consideration for the 3-D geometry of the bridge site results in tangible reductions in foundation bending demands and abutment displacements compared to those returned by a plane strain description of the problem. The results show that there is a limiting depth of liquefiable layer after which there is no importance of 3-D effects on the bridge abutment foundation demands. An increasing trend in foundation demands is observed with increasing foundation stiffness and width of the embankment. Also, no appropriate trend is found for the effect of increasing thickness of liquefiable layer.
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Details
- Title
- Parameter study to assess 3D geometric effects on bridge foundation response resulting from liquefaction-induced lateral spreading demands
- Creators
- Partha Sarathi Bhattacharjee
- Contributors
- Christopher McGann (Degree Supervisor)
- Awarding Institution
- Washington State University
- Academic Unit
- Civil and Environmental Engineering, Department of
- Theses and Dissertations
- Master of Science (MS), Washington State University
- Publisher
- Washington State University; [Pullman, Washington] :
- Identifiers
- 99900525087701842
- Language
- English
- Resource Type
- Thesis