Simplified Model of Seismic Soil-Underground Box-Type Structure Interaction

In this paper, a simplified soil-underground structure interaction analysis is presented. The soil was modeled as Winkler elastic ground, with which the box-type structure interacts. A matrix method was used for the soil-underground structure interaction analysis. The primary unknowns of the problem were structure joint rotations and translations. The axial deformation of the members of the structure was neglected. The rotation of structure as a whole was considered to reduce the number of the primary unknowns. The stiffness coefficients of the structure were obtained based on the theory of beam-on-elastic ground. Davis's (2003) dynamic soil pressure distribution over sidewall height was used to determine the equivalent joint loads, and a stiffness assembly method was used to obtain the governing equation of the problem. One numerical example is given to improve the effectiveness of the proposed model.