Mechanisms of failure for shallow foundations under earthquake loading |
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| Affiliation: | 1. Department of Civil and Environmental Engineering, George Washington University, Washington, D.C., USA;2. Department of Civil and Environmental Engineering, University of California, Davis, USA;3. Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA;4. Department of Civil and Environmental Engineering, University of Washington, Seattle, USA;5. Department of Civil and Environmental Engineering, California State University, Sacramento, USA;6. Beaty Engineering LLC, USA;7. Department of Civil and Environmental Engineering, Zhejiang University, Hangzhou, Zhejiang, China;8. GEI Consultants, Inc., Formerly at Division of Safety of Dams, Sacramento, CA, USA;9. Geosyntec Consultants, 1111 Broadway, 6th Floor, Oakland, CA 94607, USA;10. Department of Civil Engineering, National Central University of Taiwan, Taoyuan City, Taiwan;11. Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan;12. AECOM Corp., Oakland, CA, USA;13. US Army Corps of Engineers, MS, USA;14. Department of Civil, Environmental and Applied System Engineering, Kansai University, Osaka, Japan;1. Department of Civil and Environmental Engineering, Rensselaer Polytechnic Institute, Troy, NY, USA;2. Department of Civil and Environmental Engineering, University of California, Davis, USA;3. Department of Civil and Environmental Engineering, George Washington University, Washington, DC, USA;4. Department of Civil and Environmental Engineering, University of Washington, Seattle, USA;5. Department of Civil and Environmental Engineering, California State University, Sacramento, USA;6. Beaty Engineering LLC, USA;7. MOE Key Laboratory of Soft Soils and Geo-environmental Engineering, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou, China;8. Department of Engineering, Cambridge University, Cambridge, UK;9. Department of Civil Engineering, National Central University of Taiwan, Taoyuan City, Taiwan;10. Disaster Prevention Research Institute, Kyoto University, Kyoto, Japan;11. Charles E. Via Department of Civil and Environmental Engineering, Virginia Tech, USA;1. Department of Civil Engineering, The University of British Columbia, Vancouver, BC, Canada;2. Department of Civil, Construction, Architectural, and Environmental Engineering, University of L''Aquila, L''Aquila, Italy;3. Department of Civil and Environmental Engineering, University of California at Davis, Davis, CA, USA;4. Center for Geotechnical Modeling, University of California at Davis, Davis, CA, USA;1. Department of Civil Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China;2. College of Civil Engineering and Architecture, Nanchang Institute Technology, Nanchang 330099, China;1. Institute of Technology, Shimizu Corporation, Tokyo 135-8530, Japan;2. MOE Key Laboratory of Soft Soils and Geoenvironmental Engineering, Institute of Geotechnical Engineering, Zhejiang University, Hangzhou 310058, PR China |
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| Abstract: | It is widely known that the bearing capacity of a shallow foundation is reduced when the foundation is subjected to rocking moments and horizontal loads during an earthquake event. Analytical solutions generally require an assumption to be made of the kinematic failure mechanism in the soil, when the true failure mechanism is unknown. This paper discusses a series of experiments carried out on a new 1g shaking table at Cambridge University in order to measure the displacements of a shallow foundation due to seismic loading and also the development of the failure mechanism within the soil. The failure mechanism was studied using the technique of Particle Image Velocimetry (PIV), combined with high-speed videography and photogrammetry. In this paper, the failure mechanisms observed in these experiments will be compared with the theoretical results found from upper- and lower-bound solutions and the effects of such parameters as earthquake magnitude, frequency and embedment ratio (and hence surcharge) will be discussed. |
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