Location
San Diego, California
Presentation Date
26 May 2010, 4:45 pm - 6:45 pm
Abstract
In the practical seismic analysis for the project of South Park Bridge Replacement, the caisson foundations are modeled as Winkler springs in the global bridge model. The global bridge model is then excited by depth-varying ground motions acting along the height of the caisson. The foundation model would entail Winkler springs distributed over the surfaces of caisson to represent the soil continuum underlying the foundation and passive soil pressure acting on the sides. The soil springs are nonlinear for consideration of yielding of localized soil. In addition, gapping elements can also be implemented in series with the soil springs to engage a full contact between the soil and the caisson during compression and to allow separation under tension. To establish correct Winkler soil springs, pushover analyses of the caisson on continuum soils considering the nonlinearity of the soil and the interface between the caisson and soil are performed using 3D finite element method (FEM). The solutions obtained from FEM would represent the overall deformation behavior of the caisson, and also address the stress-strain behavior of the local soil elements. The depth-varying ground motions acting along the height of the caisson are obtained by 2D site response analysis.
Department(s)
Civil, Architectural and Environmental Engineering
Meeting Name
5th International Conference on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics
Publisher
Missouri University of Science and Technology
Document Version
Final Version
Rights
© 2010 Missouri University of Science and Technology, All rights reserved.
Creative Commons Licensing
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.
Document Type
Article - Conference proceedings
File Type
text
Language
English
Recommended Citation
Cheng, Zhao; Law, Hubert; and Jiang, Yang, "Soil-Structure Interaction Analysis for Bridge Caisson Foundation" (2010). International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics. 48.
https://scholarsmine.mst.edu/icrageesd/05icrageesd/session05/48
Included in
Soil-Structure Interaction Analysis for Bridge Caisson Foundation
San Diego, California
In the practical seismic analysis for the project of South Park Bridge Replacement, the caisson foundations are modeled as Winkler springs in the global bridge model. The global bridge model is then excited by depth-varying ground motions acting along the height of the caisson. The foundation model would entail Winkler springs distributed over the surfaces of caisson to represent the soil continuum underlying the foundation and passive soil pressure acting on the sides. The soil springs are nonlinear for consideration of yielding of localized soil. In addition, gapping elements can also be implemented in series with the soil springs to engage a full contact between the soil and the caisson during compression and to allow separation under tension. To establish correct Winkler soil springs, pushover analyses of the caisson on continuum soils considering the nonlinearity of the soil and the interface between the caisson and soil are performed using 3D finite element method (FEM). The solutions obtained from FEM would represent the overall deformation behavior of the caisson, and also address the stress-strain behavior of the local soil elements. The depth-varying ground motions acting along the height of the caisson are obtained by 2D site response analysis.
