MASH
Category Dynamics (behaviour and earthquake)
Publisher  NISEE - University of California, Berkeley 
Platform CDC mainframe
Status Public domain
Description Nonlinear Analysis of Vertically Propagating Shear Waves in Horizontally Layered Deposits. MASH is designed to solve the dynamic response of a deposit of horizontal soil layers. A deposit is discretized into a string of 1D constant strain finite elements with masses lumped at the nodes. An implicit formulation of the time-stepping cubic inertia algorithm is used to integrate the equations of motion. The soil material may be either viscoelastic, or nonlinear with rate independent damping. The nonlinear soil model incorporated in the program is the Davidenkov model, wherein stresses are expressed as functions of strains. Laboratory measurement of the variation of the secant modulus with cyclic strain amplitude defines the parameters used in the model. Inputs to the program include soil properties, base acceleration, time history and, optionally, pore pressure build-up during the earthquake (from program APOLLO). Outputs include the maxima of accelerations, stresses and strains within each element and response spectra.
Cost Free on WWW
Data formats supported None stated
Supplier in United States of America  NISEE - University of California, Berkeley 

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