The Earthquake Engineering Online Archive

MASH: a computer program for the non-linear analysis of vertically propagating shear waves in horizontally layered deposits

Martin, Philippe P.; Seed, H. Bolton

UCB/EERC-78/23, Earthquake Engineering Research Center, University of California, Berkeley, 1978-10, 93 pages (480/M28/1978M)

The computer program MASH is designed to analyze the dynamic response of a deposit of horizontal soil layers subjected to earthquake excitation. The deposit is discretized into a series of one-dimensional constant strain elements, and the equations of motion are integrated with respect to time by the cubic inertia method. The soil material may be either viscoelastic or nonlinear and may be modelled into the Davidenkov system of soil property expressions. The program may be used in conjunction with the program APOLLO to perform effective stress response analyses of soil deposits, in which pore pressures are generated and dissipated during and following the period of earthquake shaking. An example of this type of analysis, incorporating nonlinear soil behavior and pore pressure effects, is presented in the report.

Available online: http://nisee.berkeley.edu/documents/EERC/EERC-78-23.pdf (2 MB)