Document: NUREG-0800
Document ID: 5c405a7a-1098-462c-b352-0353348123fd
Document Type: srp
Title: 3.05
Source: NUREG-0800
Source URL: https://www.nrc.gov/docs/ML1235/ML12352A305.pdf
Revision Date: 2023-06
Chapter: 3
Section ID: 3.50
CFR Part: 
CFR Title: 

Content:
4 18.52 15.59 67.28 24.88 10.71 11.65 19.57 7.78 1.55 1.97 5 16.67 8.64 41.92 18.48 6.97 6.46 10.80 4.21 0.76 1.24 6 14.31 5.82 25.16 12.13 4.12 3.65 6.51 2.49 0.42 0.68 7 10.70 3.97 17.94 6.96 2.29 1.90 4.38 1.55 0.25 0.36 8 8.64 2.94 11.85 4.77 1.35 1.05 2.73 1.01 0.15 0.20 9 5.80 2.09 7.86 3.23 0.84 0.61 1.85 0.74 0.09 0.12 10 4.34 1.46 5.21 2.41 0.50 0.41 1.24 0.53 0.06 0.08 15 0.85 0.16 1.20 0.42 0.08 0.07 0.32 0.11 0.01 0.01 20 0.23 0.04 0.42 0.12 0.03 0.02 0.12 0.03 0.01 25 0.01 0.05 WUS Soil Sites Magnitude 5 - 6 Magnitude 6 - 7 Magnitude 7+ 3.7.1-30 Draft Revision 4 - December 2012 REFERENCES 1. NUREG/CR-6728, “Technical Basis for Revision of Regulatory Guidance on Design Ground Motions: Hazard- and Risk-consistent Ground Motion Spectra Guidelines.” 2. NUREG/CR-5347,"Recommendations for Resolution of Public Comments on USI A-40, Seismic Design Criteria," June 1989. 3. NUREG/CR-3509, "Power Spectral Density Functions Compatible with NRC Regulatory Guide 1.60 Response Spectra," June 1988. 3.7.1-31 Draft Revision 4 - December 2012 APPENDIX C TO SRP SECTION 3.7.1 SCALE FACTORS FOR RESPONSE SPECTRA DAMPING RATIOS RELATIVE TO THE 5 PERCENT DAMPED RESPONSE SPECTRA The purpose of this appendix is to present the ratios of response spectra at a given damping value to the 5 percent damped response spectrum. A number of previous recommendations have been made over the years but these have generally been limited by the restricted data set of recordings used to develop the recommendations. This study performed the evaluation using all the records currently available in the data set presented with NUREG/CR-6728. These are three component data sets (two horizontal and one vertical) of both empirical (recorded) and modified time history records. For this evaluation, spectra have been computed for each of these three records individually and then the average horizontal spectrum computed by (lognormally) averaging the two horizontal spectral accelerations for each damping