NEHRP Clearinghouse
 Title
 Hybrid Modelling of SoilStructure Interaction in Layered Media.
 File

PB84192178.pdf
 Author(s)
 Tzong, T. J.; Penzien, J.
 Source

National Science Foundation, Washington, DC.,
October 1983,
156 p.
 Identifying Number(s)
 UCB/EERC83/22
 Abstract
 The hybrid modelling approach, which effectively solves soilstructure interaction problems, is extended for use in layered soil media. This approach partitions the entire structuresoil system into a near field which consists of the structure and a portion of its surrounding soil, modelled by the finite element method, and a far field which is responsible for energy travelling away from the near field represented by an impedance model. Two analytical methods, appropriate to different layered soil systems, are employed to simulate the semiinfinite farfield region. The system identification method, which determines the approximate farfield impedance functions along the interface between the near and far fields, is applied to the singlelayer halfspace in which a rigorous representation of the farfield is difficult to obtain by direct solution. A boundary solution method is developed to calculate the exact farfield impedance matrix for cases involving layers of soil having a rigid lower boundary. By this method, the theoretical solution of the far field is combined with the nearfield finite elements through the variational principle.
 Keywords
 Far field; Earthquake engineering; Soils; Soilstructure interactions; Mechanical impedance; Excitation; Finite element techniques; Mathematical models; Near field; Dynamic structural analysis