Document: NUREG-0800
Document ID: 838f03f5-e038-48e3-9af7-74af5e319676
Document Type: srp
Title: through 3.5.3.3 for earth retaining walls).
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML0705/ML070550054.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.5.3.1
CFR Part: 
CFR Title: 

Content:
(4) D + L + T0 + R0 + E' (5) D + L + T0 + R0 + Wt (6) D + L + Ta + Ra + 1.5 Pa (7) D + L + Ta + Ra + 1.25 Pa + 1.0 (Yr + Yj + Ym) + 1.25 E (8) D + L + Ta + Ra + 1.0 Pa + 1.0 (Yr + Yj + Ym) + 1.0 E' In combinations (6), (7), and (8), the maximum values of Pa, Ta, Ra, Yr, Yj, and Ym, including an appropriate dynamic load factor, should be used unless a time-history analysis is performed to justify otherwise. Combinations (5), (7), and (8) and the corresponding structural acceptance criteria should be satisfied first without the tornado missile load in (5) and without Yr, Yj, and Ym in (7) and (8). In the review of these loads, local section strength capacities may be exceeded under these concentrated loads, provided that there will be no loss of function of any safety-related system. Both cases of L having its full value or being completely absent should be checked. 3. Allowable Stresses Allowable stresses provided in ACI 531-79, shall be supplemented by the following modifications/exceptions. A. When wind or seismic loads (OBE) are considered in the loading combinations, no increase in the allowable stresses is permitted. See Subsection II.3 of this SRP for further guidance regarding the OBE. B. Use of allowable stresses corresponding to a special inspection category should be substantiated by demonstration of compliance with the NRC recommended inspection criteria. C. All the tensile stresses will be resisted by reinforcement. D. For load conditions which represent extreme environmental, abnormal, abnormal/severe environmental, and abnormal/extreme environmental conditions, the allowable working stress may be multiplied by the factors shown in the following table: Type of Stress Factor Axial or flexural compression 2.5 Bearing 2.5 Reinforcement stress except shear 2.0 but not to exceed 0.9 fy Shear reinforcement and/or bolts 1.5 3.8.4-22 Revision 2 - March 2007 Masonry tension parallel to bed joint 1.5 Shear carried by masonry 1.3 Masonry tension perpendicular to