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Soil Dynamics

Soil Dynamics. Instructor: Prof. Deepankar Choudhury, Department of Civil Engineering, IIT Bombay. This course discusses the behaviour and properties/response of soil as a material subjected to the dynamic or cyclic time-dependent loading. Also the design and principle for machine foundations comes along with this course to consider the dynamic properties of both soil and foundation as combined mass. Behaviour of various geotechnical structures such as shallow and deep foundations, retaining structures, slopes, subgrade soil below railway, pavement, runway due to various types of time?dependent dynamic loading are discussed here with reference to codal provisions. The advanced course material on soil dynamics will be very useful to undergraduate students, post?graduate students, researchers, teachers and practitioners. A number of selected problems will be solved to illustrate the concepts clearly. (from nptel.ac.in)

Lecture 21 - Estimation of Gmax, Modulus Reduction Curves, Variation of Damping Ratio, ...

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Lecture 01 - Introduction

Vibration Theory

Lecture 02 - Degrees of Freedom, SDOF System, Types of Vibrations

Lecture 03 - SDOF System, Types of Vibrations, Free Vibration

Lecture 04 - Problems on Torsional Motion

Lecture 05 - Damped Free Vibrations

Lecture 06 - Damped Free Vibrations, Definition of Critical Damping and Problems

Lecture 07 - Decay of Motion

Lecture 08 - Forced Vibrations, Dynamic Magnification Factor (DMF)

Lecture 09 - Maxwell's Diagram of DMF, Discussion on Phase

Lecture 10 - Transmissibility Ratio, Response to Arbitrary, Step and Pulse Excitations

Lecture 11 - Response to Arbitrary, Step and Pulse Excitations, Response to Impact Load

Lecture 12 - Vibration Isolation, Vibrations Measuring Instruments

Lecture 13 - Solutions of Quiz Questions, Multi-degree of Freedom Systems

Lecture 14 - MDOF System: Equation of Motion, Longitudinal Waves in an Infinitely Long Rod

Wave Propagation

Lecture 15 - Dimensional Wave Propagation, Waves in Semi-infinite Media, Rayleigh Wave

Lecture 16 - Love Wave, Waves in Layered Medium, 3D Case-Inclined Wave, Earthquake Waves

Lecture 17 - Earthquake Waves; P-Waves, S-Waves, 3 Circle Method, Estimation of Earthquake Epicentre

Dynamic Soil Properties

Lecture 18 - Stresses in Soil Element, Field Tests, Seismic Reflection Test

Lecture 19 - Seismic Reflection Test, SASW Test, Laboratory and Model Tests

Lecture 20 - Centrifuge Tests Stress Strain Behaviour of Cyclically Loaded Soils

Lecture 21 - Estimation of Gmax, Modulus Reduction Curves, Variation of Damping Ratio, Cyclic Plate Load Test

Lecture 22 - Liquefaction, Preliminary Screening, Simplified Procedure for Liquefaction

Lecture 23 - Cyclic Stress Ratio, Evaluation of CRR, Correction Factors, Corrections for SPT

Lecture 24 - Becker Penetrometer Test (BPT), Cone Penetrometer Test (CPT), SPT vs BPT

Machine Foundations

Lecture 25 - Types of Machine Foundations, Methods of Analysis, Design of Machine Foundations

Lecture 26 - Tschebotarioff's Reduced Natural Frequency Method

Lecture 27 - Problems on Tschebotarioff's Method, Mass-Spring-Dashpot (MSD) Model

Lecture 28 - MSD Model - Yawing Mode of Vibration, Use of MSD Model for Analysis

Lecture 29 - Problems on Use of MSD Model for Analysis, Rocking Mode of Vibrations

Lecture 30 - Torsional Mode/Yawing Mode, Constraint Force Type Excitation, EHS Theory

Lecture 31 - EHS Theory, Vibrational Control

Lecture 32 - Use of EHS Theory for Analysis

Lecture 33 - Use of EHS Theory for Analysis (cont.)

Soil Improvement Techniques

Lecture 34 - Liquefaction Mitigation Methods, Vibro Compaction, Densification Techniques

Lecture 35 - Soil Improvement Methods, Dynamic Compaction, Reinforcement Techniques

Dynamic Soil-Structure Interaction

Lecture 36 - Force-based Analysis, Dynamic Analysis using MSD Model

Lecture 37 - Behaviour of Subgrade Soil below Rail Track

Lecture 38 - Quiz