What Is Response Spectrum Analysis?
RSA (the 12.9's — the modal's; the 90%) is the analysis (the 90%'s — the mass's; the 12.9.1's) that combines (the modal's — the 12.9's; the CQC's) via (the CQC's — the 12.9's; the SRSS's). The analysis: the 12.9's (the 90%'s — the mass's; the 12.9.1's), the 90%'s (the mass's — the 12.9.1's; the 12.9's), the CQC's (the SRSS's — the 12.9's; the 100/30's), and the 100/30's (the 12.5's — the directional's; the CQC's). The modes' — the RSA combined.
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How RSA works
The 90% (the mass's — the 12.9.1's; the 12.9's), the 12.9.1 (the 90%'s — the mass's; the 12.9's), the CQC (the SRSS's — the 12.9's; the 100/30's), the SRSS (the CQC's — the 12.9's; the closely's — the spaced), and the 12.9 (the 90%'s — the CQC's; the modal's).
The 90%'s rule
The 90% (the 12.9.1's — the mass's; the 12.9's), the 12.9.1 (the 90%'s — the 12.9's; the mass's), the modes (the 90%'s — the 12.9.1's; the sufficient's), the 12.9 (the CQC's — the 90%'s; the 12.9.1's), and the 90% (the mass's — the modes'; the 12.9.1's).
Scaling and direction
The 100/30 (the 12.5's — the 100%'s; the 30's), the 85% (the base's — the 12.9.4's; the ELF's), the 12.9.4 (the 85%'s — the base's; the ELF's), the ELF (the 85%'s — the 12.9.4's; the base's), and the 100% (the 30's — the 12.5's; the 100/30's). The RSA's — the 90%'s mass; the 85%'s ELF base.
The bottom line
Run RSA per ASCE 7 12.9 (90% mass participation per 12.9.1, CQC/SRSS modal combination, 100/30 directional per 12.5, scale base shear to 85% ELF per 12.9.4) — the workhorse linear-dynamic method.
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