Analysis and Prediction of Outrunning Ground Motion

摘要

With the advent of the hard mobile launcher, the need for an accurate prediction procedure for the outrunning ground shock (i.e., the wave that arrives before the airblast) has increased. Most methods developed in the past for the prediction of the outrunning wave concentrate on a limited number of HE experiments. This report describes the development of a new method to predict the outrunning portion of the ground shock. This method is an extension of the one developed by Sauer (1964). It is based on the empirical analysis of data provided by several recent HE experiments at various heights-of-burst. A characteristic velocity time history waveform, which is normalized by the outrunning velocity peak and a site dependent time scale factor, is introduced. The method is evaluated against data from several experiments and the results are considered satisfactory. Keywords: Outrunning; Oscillatory Ground Motion; Direct Induced; Prediction Procedure; Wave Propagation; Ground Shock Data.