Soil-structure-interaction analysis in frequency domain using fixed base eigenvalues

Dynamic soil-structure-interaction analyses are usually performed in the frequency domain. Solutions for large buildings require much computer time because of the many degrees of freedom that are needed to represent the dynamic behaviour of the structure. The method presented takes advantage of the fact, that for seismic loading the behaviour of the structure can be represented by only a few natural modes. Thus the number of the equations of motion that have to be solved are drastically reduced. (author)