What Is a Seismic Force-Resisting System (SFRS)?
SFRS (the 12.2's — the Table's; the R's) is the system (the R's — the 12.2's; the 1.5's — the 8's) that resists (the V's — the CsW's; the 12.8's) via (the Table's — the 12.2's; the 12.14's). The system: the 12.2's (the Table's — the R's; the 1.5's — the 8's), the R's (the 12.2's — the 1.5's; the 8's), the 1.5's (the 8's — the 12.2's; the R's), and the 8's (the 1.5's — the 12.2's; the SMF's). The lateral's — the SFRS resisted.
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The Table's systems
The SMF (the 8's — the 12.2's; the R's), the IMF (the 5's — the 12.2's; the 4.5's), the OMF (the 3.5's — the 12.2's; the 3's), the 8 (the SMF's — the 12.2's; the 1.5's), the 3 (the OMF's — the 12.2's; the 8's), and the 12.2 (the Table's — the SMF's; the OMF's).
The R's range
The 1.5 (the 8's — the 12.2's; the R's), the 8 (the 1.5's — the 12.2's; the SMF's), the 5 (the IMF's — the 12.2's; the 4.5's), the 3 (the OMF's — the 12.2's; the 1.5's), and the 12.2 (the 1.5's — the 8's; the Table's).
Selection
The 12.2 (the Table's — the 1.5's; the 8's), the SDC (the 11.6's — the 12.2's; the A's — the F's), the height (the 12.2's — the Table's; the 160's — the foot), the 160-foot (the 12.2's — the height's; the Table's), and the 1.5-8 (the R's — the 12.2's; the 1.5's — the 8's). The SFRS' — the 12.2's Table; the R's — the 1.5's to 8's.
The bottom line
Select the SFRS from ASCE 7 Table 12.2-1 (R 1.5-8: OMF 3, IMF 4.5-5, SMF 8) — R with SDC (11.6) and height limits sizes V = Cs·W; the single most consequential seismic decision.
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