Application rule of one-dimensional frequency-domain wave propagation analysis

The authors examined the reliability of the linear and non-linear one-dimensional wave propagation analysis by frequency-domain approach through simulation study using recorded motions obtained at two vertical arrays and the geotechnical data obtained in-situ. It was found that the method is sufficiently reliable in the present form in which frequency-independent damping and the reference strain level by factor of 0.65 to the maximum strain are assumed, if the analysis were supported by a carefully determined velocity profile of the site and strain-dependency of soil layers. Following what have been obtained through the above study, the authors proposed a practical rule to be followed in application of the method, in order to keep the results reliable. (author)