Document: NUREG-0800
Document ID: 73dc4705-6dff-4f44-87ee-2a6f76cc6536
Document Type: srp
Title: OTHER SEISMIC CATEGORY I STRUCTURES
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1319/ML13198A258.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.8.4
CFR Part: 
CFR Title: 

Content:
e 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 3.8.4-24 Revision 4 – September 2013 Bearing 2.5 Reinforcement stress except shear 2.0 but not to exceed 0.9 fy Shear reinforcement and/or bolts 1.5 Masonry tension parallel to bed joint 1.5 Shear carried by masonry 1.3 Masonry tension perpendicular to bed joint for reinforced masonry 0.0 Note: When anchor bolts are used, the design should prevent facial spalling of masonry unit. 4. Design and Analysis Considerations A. The analysis should follow established principles of engineering mechanics and take into account sound engineering practices. B. The assumptions and modeling techniques used should give proper consideration to boundary conditions, cracking of sections, if any, and the dynamic behavior of masonry walls. C. Damping values to be used for dynamic analysis should be those for reinforced concrete in accordance with guidance provided in RG 1.61. D. The seismic analysis should account for the variations and uncertainties in mass, materials, and other pertinent parameters used. E. The analysis should consider both in-plane and out-of-plane loads. F. The analysis should consider interstory drift effects. G. In new construction, no unreinforced masonry wall is permitted; also, all grout in concrete masonry walls should be consolidated by vibration. H. For masonry shear walls, the minimum reinforcement requirements shall be as provided in ACI 531. I. The acceptance of special construction (e.g., multiwythe, composite) or other items not covered by the code are reviewed on a case-by-case basis. J. Applicants should submit for review the quality assurance/quality control (QA/QC) information. In the event QA/QC information is not available, a field survey and a test program reviewed and approved by the NRC staff