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centrifuge 2 - University of Sydney Seminar 19 August 2009...

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University of Sydney Seminar 19 August 2009 Anirban De, Ph.D., P.E., Manhattan College, New York 1 Use of a Geotechnical Centrifuge to Study the Effects of Surface Explosions Anirban De, Ph.D., P.E. Associate Professor Department of Civil & Environmental Engineering Manhattan College Bronx, New York Presented at: School of Civil Engineering The University of Sydney 19 August 2009 Acknowledgements Research funded by the Civil & Mechanical Systems (CMS) Program of the National Science Foundation (NSF), Dr. Richard Fragaszy, Program Director, through: Small Grants Exploratory Research (SGER) Research Opportunity Award (ROA) Research Experience for Undergraduates (REU) Prof. Thomas F. Zimmie of RPI – research collaborator Undergraduate and graduate student researchers from: Manhattan College Rensselaer Polytechnic Institute
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University of Sydney Seminar 19 August 2009 Anirban De, Ph.D., P.E., Manhattan College, New York 2 Outline • Introduction Background on Centrifuge Modeling Scaling of Explosions on Centrifuge • Cratering Experimental Models and Results Earth dams Underground structures Conclusions & Practical Applications Centrifuge tests of New Orleans levee failure Outline • Introduction Scaling of Explosions on Centrifuge • Cratering Experimental Models and Results Earth dams Underground structures Conclusions & Practical Applications
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University of Sydney Seminar 19 August 2009 Anirban De, Ph.D., P.E., Manhattan College, New York 3 RPI Centrifuge Radius = 3 m, Capacity = 150 g-tons Outline • Introduction Scaling of Explosions on Centrifuge • Cratering Experimental Models and Results Earth dams Underground structures Conclusions & Practical Applications
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University of Sydney Seminar 19 August 2009 Anirban De, Ph.D., P.E., Manhattan College, New York 4 Principles of Centrifuge Modeling Prototype at 1g environment H Stress, σ = ρ gH g Prototype ρ = density g = accln. due to gravity Principles of Centrifuge Modeling H/N Stress, σ = ρ gH/N g 1:N scale model at 1g environment Model
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University of Sydney Seminar 19 August 2009 Anirban De, Ph.D., P.E., Manhattan College, New York 5 H/N Ng 1:N scale model at Ng environment (on a centrifuge) Centrifuge Model Stress, σ = ρ • Ng H/N = ρ gH σ model = σ prototype Principles of Centrifuge Modeling Principles of Centrifuge Modeling Compare stresses σ model = σ prototype H σ = ρ gH g Prototype H/N σ = ρ • Ng H/N = ρ gH Ng Centrifuge Model
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University of Sydney Seminar 19 August 2009 Anirban De, Ph.D., P.E., Manhattan College, New York 6 Principles of Centrifuge Modeling H Vertical stress = ρ gH H/N Vertical stress = ρ( Ng)(H/N) = ρ gH 1 g N g Stresses at corresponding points are equal in model and prototype CENTRIFUGE MODEL built to 1:N scale PROTOTYPE σ model = σ prototype Engineering Behavior of Soil Materials – Function of Stress Level Therefore, it is important that prototype stresses be modeled correctly in order to simulate other phenomena in the model.
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University of Sydney Seminar
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