ASCE 7 Modal Response Spectrum Analysis: Scale Spectrum or Results
ASCE 7 Modal Response Spectrum Analysis: Scale Spectrum or Results
(OP)
In reviewing ASCE 7-10 12.9, I see two possible ways to complete a MSRA.
Procedure A:
1. Run MSRA based on full design response spectrum
2. Scale results for R/I.
3. Scale up results for 0.85 of ELF if required by 12.9.4.2
Procedure B:
1. Scale design response spectrum for R/I.
2. Run MSRA based on elastic design response spectrum
3. Scale up results for 0.85 of ELF if required by 12.9.4.2
Are both of these ways permissible? Would they theoretically yield same results?
Procedure A:
1. Run MSRA based on full design response spectrum
2. Scale results for R/I.
3. Scale up results for 0.85 of ELF if required by 12.9.4.2
Procedure B:
1. Scale design response spectrum for R/I.
2. Run MSRA based on elastic design response spectrum
3. Scale up results for 0.85 of ELF if required by 12.9.4.2
Are both of these ways permissible? Would they theoretically yield same results?






RE: ASCE 7 Modal Response Spectrum Analysis: Scale Spectrum or Results
RE: ASCE 7 Modal Response Spectrum Analysis: Scale Spectrum or Results