Vibrations of soils and foundations

Chapter ten treats methods of analysis and design of dynamically loaded foundations. These methods depend on the design criteria, applied forces, soil response, and analytical procedures for relating these quantities. The design criteria were based on a failure criterion of a limiting amplitude of motion, or a limiting velocity or acceleration of the foundation. The analytical procedures for establishing the dynamic behavior of a foundation relate the applied forces, soil properties, and foundation weights and geometry to the response. By successive corrections of the design parameters, the analytical procedures provide a method for developing a dynamic response of the foundation which falls within the design limits. Several simplified methods of analysis have been discussed in Chapter ten; these have been found satisfactory when the prototype conditions correspond to the assumptions made in establishing the theory. Vibration from subways and a railway is reviewed in Table 10.6.