JAWAHARLAL NEHRU TECHNOLOGICAL UNIVERSITY HYDERABAD

Course Objectives:

• 1. To understand the basics of dynamics, like damping, wave propagation, resonance and
• 2. effect of modes of vibrations.
• 3. To determine the dynamic soil properties by field and laboratory tests.
• 4. To study the effect of liquefaction and anti liquefaction measures.
• 5. To study vibration isolation, machine foundation design.

Course Outcome

At the end of the course, student will be able to:

• 1. Understands theory of vibration and wave propagation through the ground.
• 2. Determination dynamic soil properties required for design.
• 3. Evaluate liquefaction potential of any site and remediation.
• 4. To design machine foundations for reciprocating and impact loads.

UNIT - I

Fundamentals of Vibration: Definitions, Simple harmonic motion, Response of SDOF systems of Free and Forced vibrations with and without viscous damping, Frequency dependent excitation, Logarithmic decrement, Determination of viscous damping, Systems with Two and Multiple degrees of freedom, Vibration measuring instruments.

UNIT - II

Wave Propagation and Dynamic Soil Properties: Propagation of seismic waves in soil deposits - Attenuation of stress waves, Stress-strain behavior of cyclically loaded soils, Dynamic soil properties - Laboratory and field-testing techniques, Elastic constants of soils, Correlations for shear modulus and damping ratio in sands and clays.

UNIT - III

Foundation Vibration Analyses: Types, General Requirements, Permissible amplitude, Allowable soil pressure, Modes of vibration of a rigid foundation block, Vertical vibration of circular foundations resting on Elastic Half Space- Lambs, Reissner, Quinlan & Sungs analogies.

UNIT - IV

Design of Machine Foundations: Analysis and design of block foundations for reciprocating engines, IS code of practice design procedure for foundations of reciprocating and impact type machines. Vibration isolation and absorption techniques.

UNIT - V

Machine Foundations on Piles: Introduction, Analysis of piles under vertical vibrations, Analysis of piles under translation and rocking, Design procedure for a pile supported machine foundation.

REFERENCE:

• 1. Swami Saran - Soil Dynamics and Machine Foundation, Galgotia Publications Pvt. Ltd. (2010)
• 2. Prakash, S. - Soil Dynamics, McGraw Hill Book Company (1981)
• 3. I. Chowdhary and S P Dasgupta - Dynamics of Structures and Foundation, 2009.
• 4. Arya, S. D, O’Neil, M. and Pincus, G.- Design of Structures and Foundations for Vibrating Machines, Gulf Publishing Co., 1979. R19 M.TECH GEOTECHNICAL ENGG.
• 5. Prakash, S. and Puri, V. K. - Foundation for Machines: Analysis and Design, John Wiley & Sons, 1998.
• 6. Kameswara Rao, N. S. V. - Vibration Analysis and Foundation Dynamics, Wheeler Publication Ltd., 1998.
• 7. Richart, F. E. Hall J. R and Woods R. D. - Vibrations of Soils and Foundations, Prentice Hall Inc., 1970.
• 8. Das, B. M. - Principles of Soil Dynamics, PWS KENT publishing Company, Boston.2002
• 9. Bharat Bhushan Prasad – Advanced Soil Dynamics and Earthquake Engineering, PHI Learning Pvt. Limited, New Delhi, 2011. R19 M.TECH GEOTECHNICAL ENGG. M.TECH.- I YEAR- II SEMESTER GEOTECHNICAL ENGINEERING