What Is a Diaphragm Chord and Collector?
Chords (the 12.10.1's — the boundary's; the tension's) resist (the diaphragm's — the M; the C/T) while (the collectors' — the drag's; the strut's) deliver (the shear's — the 100-kip; the 12.10's). The chord: the 12.10.1's (the M/d's — the C/T's), the collector (the 12.10.2's — the 1.0's; the Omega's), the 100-kip (the 200's — the typical; the 12's), and the 25-foot (the spacing's — the 50's; the 12's). The diaphragm's — the boundary resisted.
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Chords
The 12.10.1 (the boundary's — the M/d's; the C/T's), the M/d (the moment's — the depth's; the 100-kip's), the 100-kip (the 200's — the tension's; the 12's — the compression), the 2x (the splices' — the 12.10.2's; the connection's), and the 25-foot (the 50's — the 12's; the spacing's).
Collectors
The 12.10.2 (the drag's — the 1.0's; the Omega's — the 2.5's), the 100-kip (the 200's — the strut's; the 12's), the 2x (the connection's — the 12.10.2's; the 2.0's), the 25-foot (the 50's — the 12's; the spacing's), and the 1.0 (the 2.5's — the Omega's; the 12.10.2's).
Design together
The M/d (the C/T's — the 100-kip's; the 12.10.1's), the 1.0 (the Omega's — the 2.5's; the 12.10.2's), the 2x (the 12.10.2's — the 2.0's; the connection's), the 100-kip (the 12's — the 200's; the typical), and the 25-foot (the 12's — the 50's; the spacing's). The chord's — the M/d's C/T; the collector's — the 1.0 Omega's.
The bottom line
Design chords per 12.10.1 (C/T = M/d) and collectors per 12.10.2 (1.0Ω₀ ≤2.5, connections at 2x force) — 100-200 kip boundary forces at 25-50 ft spacing tying the diaphragm to the LFRS.
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