Document: NRC Regulatory Guide
Document ID: a03860d0-46a2-4c53-b0e5-9398a146bf12
Document Type: regulatory_guide
Title: Safety-Related Steel Structures and Steel-Plate Composite
Source: NRC Regulatory Guide Division 1
Source URL: https://www.nrc.gov/docs/ML2033/ML20339A558.pdf
Revision Date: 2023-05
Chapter: 
Section ID: RG-1.243
CFR Part: 
CFR Title: 

Content:
ter than the magnitude of any portion of the impulsive loading, which is approximately constant for a time equal to or greater than the first fundamental period of the structural member. DG-1304. Page 12 11.1.3. In addition to the deformation limits under 11.1.4. to 11.1.7. below, the maximum deformation should not result in the loss of intended function of the structural wall nor impair the safety-related function of other systems and components. 11.1.4. For flexure-controlled SC walls as defined in Section N9.6b of ANSI/AISC N690-18, the permissible displacement ductility ratio demand should satisfy all of the following: • ductility ratio less than or equal to 10, • principal strain of the faceplates less than or equal to 0.05 (Johnson et al., 2014) (Ref. 27), and • rotational capacity of any yield hinge less than or equal to 0.07 radians (4 degrees) (Bruhl et al., 2017, Ref. 28). 11.1.5. For SC walls resisting axial compression, the permissible displacement ductility ratio should be as shown in 11.1.5.1 to 11.5.1.3: 11.1.5.1. When compression controls the design as defined by the balanced point in a load-moment interaction diagram, the permissible ductility ratio should be 1.0. 11.1.5.2. When the compression load is less than 0.1(f'c Ag), where Ag is the sum of the area of concrete infill and the net area of the faceplates, or one-third of that which would produce balanced conditions, whichever is smaller, the permissible ductility ratio should be as given in 11.1.4. 11.1.5.3. The ductility ratio varies linearly between 1.0 and that given in 11.1.4 for conditions between those described in 11.1.5.1 and 11.1.5.2. 11.1.6. The permissible displacement ductility ratio in flexure should not exceed 3.0 for loads such as blast and compartment pressurization, which could affect the integrity of the structure as a whole. 11.1.7. For shear-controlled SC walls with yielding reinforcement spaced at section thickness divided by two or smaller, the ductility ratio is no