Document: NUREG-0800
Document ID: 1f9c2564-a291-4ef6-b7a8-4105b4643ddf
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:
lation,” as well as the “many site response calculations” described above. In no case should the LB shear modulus be less than that value consistent with standard foundation analysis that yields foundation settlement under static loads exceeding design allowables. The UB shear modulus should not be less than the BE shear modulus defined at low strain and as determined from the geophysical testing program. In no case should the material soil damping as expressed by the hysteretic damping ratio exceed 15 percent (NUREG/CR-1161). For the case of analyses using generic broad-banded ground motion spectra, the BE shear modulus and damping of each material of the site profile can be defined in terms of its low strain values. The upper and low bound shear moduli can then be defined at twice and one-half the BE values, with damping maintained at its low strain value. Alternate approaches can be reviewed on a case-by-case basis.