Analysis of Soil-Foundation-Structure Interaction During Earthquakes
This series includes technical reports prepared by faculty, students and staff who are associated with the John A. Blume Earthquake Engineering Center at Stanford University. While the primary focus of Blume Center is earthquake engineering, many of the reports in this series encompass broader topics in structural engineering and materials, computational mechanics, geomechanics, structural health monitoring, and engineering life-cycle risk assessment. Each report includes acknowledgments of the specific sponsors for the report and underlying research. In addition to providing research support, the Blume Center provides administrative support for maintaining and disseminating the technical reports. For more information about the Blume Center and its activities, see https://blume.stanford.edu.
The primary objectives of this study are to develop procedures and computer programs for determining the response of soil-foundation structure interaction systems during earthquakes as well as to investigate the nature of soil effect and the interaction effect. A two-dimensional analytical model consists of one-dimensional structural members, a two-dimensional rigid foundation block, and quadrilateral finite elements which idealize soil deposits. The soil is treated as either a linear elastic or an elastic-plastic material. Although engineers have recognized the complex behavior of soil-foundation-structure systems during ground shaking because of non-linear soil behavior and foundation embedment into the soil deposits, most interaction studies have relied on simple models. Assuming the linear elastic stress-strain behavior of the soil a two-dimensional analytical model of soil-foundation-structure interaction is developed. The accuracy of the model is evaluated regarding the influences of artificial side boundary and finite element size. Parameter studies are performed for soil effects and interaciton effects, changing soil properties, soil depth, earthquake motions, structures and foundation embedment depth. A second analytical model is developed to incorporate the non-linear stress-strain behavior of the soil, i'.e. linear VB. elastic-plastic or equivalent linear VB. elastic-plastic, are investigated to determine the effect and significance of non-linear soil behavior. The parametric studies show that the existence of the foundation block considerably affects the response of the structure resting on the foundation and that the soil deposits play a key role in determining the magnitude and frequency characteristic of the response of soil-foundation structure systems. Realistic response predictions of structures during intensive bedrock shaking can be achieved only by non-linear analysis procedures. The overall studies show that the suggested analytical procedures are a promising approach for predicting the responses of soil and soil-foundation-structure system.
- Preferred Citation
- Ukaji, K. (1975). Analysis of Soil-Foundation-Structure Interaction During Earthquakes. John A. Blume Earthquake Engineering Center Technical Report 18. Stanford Digital Repository. Available at: http://purl.stanford.edu/br489bx7478
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- John A. Blume Earthquake Engineering Center
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