Document: NUREG-0800
Document ID: 072325a8-02ea-4d59-bb3f-06592c340804
Document Type: srp
Title: The Aluminum Association, Specification for Aluminum Structures
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0520/ML052070327.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.4
CFR Part: 
CFR Title: 

Content:
the ground (e.g., embedded walls of nuclear power plant structures); and (c) completely buried underground structures (e.g., tunnels, underground tanks). (2) For rigid walls with shallow embedment, it seems appropriate to use the M-O method using the peak ground acceleration coefficient. (3) For deeply embedded basement walls with a massive superstructure above ground, which may experience rocking components of motion, and for rigid gravity walls, which may undergo rotational displacements about the vertical axis, the use of the M-O method does not seem appropriate. For such cases, the procedures recommended in Bechtel Design Guide C-2.44 (1980) need to be modified, in view of the extensive amount of more recent work done in this area. Proper consideration should be given to the actual conditions (e.g., variations of soil properties and seismic accelerations with depth, flexibility and expected deformations of embedded walls) while determining the appropriate method to calculate the lateral soil pressures, as the U.S. Army report (ITL-92-11) has attempted to do. In such complex cases, the lateral soil pressures derived from the results of an SSI analysis may be used in conjunction with the pressures predicted by the M-O method to determine a range of dynamic lateral pressures that could be expected to act on the embedded walls. These results may also be compared, as a check, with the lateral soil pressures that could be estimated by using the Uniform Building Code provisions for the base shear. In case an applicant wishes to use the elastic solution proposed by Wood (EERL 73-05), a case-by-case justification for the factor 2 for nonyielding walls mentioned in Bechtel Design Guide C-2.44 (1980) must be provided by the applicant. REFERENCES 1. American Society of Civil Engineers (ASCE), 4-86, Section 3.5.3, "Seismic Analysis of Safety Related Nuclear Structures and Commentary on Seismic Analysis of Safety Related Nuclear Structures," New York, NY, 1986. 3.8.4-55 DRAFT