THE ZONED FINITE STRIP METHOD IN GEODYNAMICS

The Zoned Finite Strip method, where one strip can have several differ ent materials in the horizontal direction, has been extended for dynam ic problems. Eigenfrequencies and eigenmodes are calculated e.g. in or der to perform a response spectra analysis in the case of an earthquak e loading. Besides the new dynamic capabilities, some improvements are proposed for the static case. Also some very efficient solution metho ds, specially for finite strip problems, are included and commented up on. The extensions have been applied to three different problems and t he results are compared with analytical and numerical (finite element) methods. The examples show good agreement between the different metho ds.