Keynote lecture: Some wave mechanics applications

The solution to the one dimensional wave equation is used to determine the maximum impact force at the top of a concrete pile for a given ram weight, cushion stiffness, and pile impedance. The result is used to generate a set of curves that can be used to assist in the selection of a pile cushion as limited by maximum compression stress. A second problem, the wave equation modeling of the Statnamic load testing system, was also studied. The testing process was modeled using a wave equation computer program. A comparison of the commonly used damping model, Smith damping, with the Rausche model can be used to evaluate the appropriateness of the two models. This study indicates the desirability of the Rausche model and the necessity for further study to recommend appropriate values for the Rausche damping constant.