Analysis And Design Of Foundations For Vibrations

A textbook for a graduate course on the aspects of vibrations in foundation engineering. Vibration criteria & theory; Vibration of blocks & beams; Analysis of beams, frames & vibration records; Theoretical solutions for foundation vibration problems; Design of shallow & deep foundations; Measurement of dynamic soil properties; Instrumentation; Isolation techniques; Computer modeling.

This text brings together traditional and new concepts and procedures for analyzing and designing dynamically loaded structures.

This book provides simple physical models to represent the unbounded soil in time and frequency domain analysis. They do not supplant the more generally applicable rigorous methods, but rather supplement them. The physical models used consists of the following representations: cones based one-dimensional rod theory; lumped-parameter models with frequency-independent springs, dashpots, and masses; and prescribed wave patterns in the horizontal plane. The physical models thus offer a strength-of-materials approach to foundation dynamics.

Theory of vibrations. Wave propagation in an elastic medium. Dynamic soil properties. Unbalanced forces for design of machine foundations. Foundations for reciprocating machines. Foundations for impact machines. Foundations for high-speed rotary machines. Foundations for miscellaneous types of machines. Vibration absorption and isolation. Dynamic response of embedded block foundations. Machine foundations on piles. Case histories. Construction of machine foundations. Computer program for the design of a block foundation. Computer program for the design of a hammer foundation. Brief description of some available computer programs. Computation of moment of inertia. Conversion factors.

Structural analysis is usually carried out by a strength-of-materials approach that allows complex 3-D structures to be modelled adequately for design needs in a single dimension. However, this approach is not extensively used in geotechnical engineering, partly because 3-D media (soil, rock) are present, but more importantly because until recently the methods necessary to carry out this form of analysis did not exist. In the last ten years efforts at modelling practical problems in foundation analysis using a strength-of-materials approach have developed the concept of the conical bar or beam as a tool. Such cone models can be used to model a foundation in a dynamic soil-structure interaction analysis with a variation of the properties with depth. This book develops this new approach from scratch in a readable and accessible manner. A systematic evaluation for a wide range of actual sites demonstrates sufficient engineering accuracy. A short computer program written in MATLAB and a user-friendly executable program are provided, while practical examples ensure a clear understanding of the topic. Simplifies complex 3-D analysis of soil-structure interaction Applies strength-of-materials approach to geotechnical engineering Illustrated with practical examples Executable program and MATLAB program for foundation vibration analysis

More than ten years have passed since the first edition was published. During that period there have been a substantial number of changes in geotechnical engineering, especially in the applications of foundation engineering. As the world population increases, more land is needed and many soil deposits previously deemed unsuitable for residential housing or other construction projects are now being used. Such areas include problematic soil regions, mining subsidence areas, and sanitary landfills. To overcome the problems associated with these natural or man-made soil deposits, new and improved methods of analysis, design, and implementation are needed in foundation construction. As society develops and living standards rise, tall buildings, transportation facilities, and industrial complexes are increasingly being built. Because of the heavy design loads and the complicated environments, the traditional design concepts, construction materials, methods, and equipment also need improvement. Further, recent energy and material shortages have caused additional burdens on the engineering profession and brought about the need to seek alternative or cost-saving methods for foundation design and construction.