21

Dynamic Loading of Soil

CHAPTER HIGHLIGHTS

Earthquake: seismic waves, magnitude – Other dynamic loads – Theory of vibration: free and forced vibrations with and without damping – Types of machines and machine foundations – Dynamic bearing capacity of shallow foundations – Design requirements – Methods of analysis for block foundation – Liquefaction of soils

21.1 INTRODUCTION

Elastic waves moving through a soil mass produce ground motion, which is transmitted through foundations to a structure as vibrations. The vibrations are caused by earthquakes or from construction activity such as rock blasting, pile driving, etc. On the other hand, vibrations also result from operating machinery and are transmitted through the foundations to the soil. ...

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