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|Title:||Probabilistic solution for one-dimensional plane wave propagation in homogeneous bilinear hysteretic materials|
|Publisher:||Structures Laboratory (U.S.)|
Engineer Research and Development Center (U.S.)
|Series/Report no.:||Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; SL-82-7.|
Abstract: The ground shock calculations codes currently used to predict the states of stress and ground motions induced in natural earth masses by explosive detonations are deterministic tools; that is, their input parameters (soil stress-strain and strength properties, soil density, applied airblast surface overpressure, etc.) are specified as single-valued quantities. In actuality, however) both the properties of earth materials and the characteristics of the airblast pulse are random variables. Consequently, the resulting states of stress and ground motion in a natural earth mass are also random variables. Therefore, the ground shock calculation problem should be treated probabilistically. This paper describes the development of a probabilistic solution for stress wave propagation in homogeneous bilinear hysteretic materials subjected to an exponentially decaying surface airblast pulse. The partial derivative method is used to calculate the time histories of the moments of the dependent (output) variables, consisting of particle displacement, particle velocity, and stress, in terms of functions of moments of the independent (input) variables. The partial derivatives are evaluated numerically using finite-difference approximations. Several sensitivity analyses are conducted to illustrate how the solution technique can be used to quantify and rank the relative effects of input variabilities or uncertainties on the dispersion of output quantities. Finally, application of the methodology for conducting probabilistic analyses of airblast-induced vertical ground shock is demonstrated.
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