Location

San Diego, California

Session Start Date

5-24-2010

Session End Date

5-29-2010

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

Appears In

International Conferences on Recent Advances in Geotechnical Earthquake Engineering and Soil Dynamics

Meeting Name

Fifth Conference

Publisher

Missouri University of Science and Technology

Publication Date

5-24-2010

Document Version

Final Version

Rights

© 2010 Missouri University of Science and Technology, All rights reserved.

Document Type

Article - Conference proceedings

File Type

text

Language

English

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May 24th, 12:00 AM May 29th, 12:00 AM

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.