EFFECT OF SEPARATION DISTANCE AND SOIL PARAMETERS ON THE STRUCTURE-SOIL-STRUCTURE INTERACTION RESPONSE OF ADJACENT DEEPLY EMBEDDED STRUCTURES

摘要

Structure-Soil-Structure Interaction (SSSI) is the effect of a neighboring structure on the dynamic response of a given structure on a common soil site. For structures that have large footprints and deep embedment, it is anticipated that SSSI effects may be significant. The focus of this paper is to quantify this effect for such a case where identical structures of large footprints and deep embedments are placed in near proximity of each other. A simplified 2-D planar model is created, representative of a deeply embedded structure with a large footprint. The effect of SSSI is considered using a line of symmetry at a finite distance in the free-field equal to half of the separation distance being analyzed. The analysis is completed for three realistic soil profiles (soft, medium, and hard) and two input response spectra, representative of typical motions in the Central Eastern United States and the Western United States. For each permutation of soil and motion, the separation distance is varied and compared against an analysis using the individual model. The effect of the separation distance between the neighboring structures and the impact on structural seismic demands and equipment qualification demands are assessed and discussed in this paper.