Document: NUREG-0800
Document ID: 03d6f576-ae6a-4439-8d9a-e5695f0bf98a
Document Type: srp
Title: -
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A223.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.7.2
CFR Part: 
CFR Title: 

Content:
Revision 4 – September 2013 accepting a particular modeling method include: (1) the extent of embedment, (2) the layering of the soil/rock strata, and (3) the boundary of the soil-structure model. All SSI analyses should recognize the uncertainties prevalent throughout the phenomenon, and include consideration of the following: A. The random nature of the soil and rock configuration and material characteristics. B. Uncertainty in soil constitutive modeling (soil stiffness, damping, etc.). C. Nonlinear soil behavior. D. Coupling between the structures and soil. E. Lack of lateral uniformity in the site soil profile that is usually assumed to be uniformly layered in all horizontal directions in SSI analyses. F. Effects of the flexibility of soil/rock. G. Effects of the flexibility of basemat, sidewalls and interior structures. H. The effect of pore water on structural responses, including the effects of variability of ground-water level with time. I. Effects of potential separation or loss of contact between the structure (embedded portion of the structure and foundation mat) and the soil during the earthquake. J. If incoherence effects to reduce high frequency motions are included in the SSI response, consideration of the potential variation of the Coherency Function described in DC/COL-ISG-01 with depth should be included in the evaluation. The procedures by which strain-dependent soil properties (damping, shear modulus, pore pressure development), layering, and variation of soil properties are incorporated in the analysis are reviewed. Assumptions for modeling the soil-structure system and computer program validation documents are also reviewed. If applicable, the criteria for determining the location of the bottom boundary and side boundary of the soil-structure system model are reviewed. The procedures used in the SSI analysis to account for effects of adjacent structures, if any, on structural response are reviewed. To perform a seismic analysis for an SSI