Computer Material Models for Soils, Rock, and Concrete Using FLAC and DYNA

This report summarizes material models available for the analysis of soils in the computer codes, FLAC and DYNA. The input constants needed for these models are emphasized. Typical values or ranges of values are given, and methods to calculate the parameters from laboratory data are discussed. In addition, dynamic damping in computations is discussed. Two components, mass (structural inertia) and stiffness (material hysteresis), are discussed. Field-measured values are presented and methods to calculate material damping in the lab shown. The report concludes that nonlinear analyses can be used to better understand complex site response of dams; models are available for these analyses. It is recommended that measured values from the structure in question be used for analyses.