What Is a Transfer Diaphragm in Seismic Design?
Transfer diaphragms (the 12.10.3's — the 25%'s; the offset) move (the shear's — the 100-kip; the 12.10's) across (the offset's — the 25%'s; the discontinuity) via (the 25%'s — the 12.10.3's; the amplified). The transfer: the 12.10.3's (the 25%'s — the offset's; the 1.0's — the Omega's), the 100-kip's (the 200's — the typical; the 12's), the 25%'s (the 12.10.3's — the offset's; the 1.4's), and the 2x's (the connection's — the 12.10.2's; the 2.0's). The shear's — the offset transferred.
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How transfers work
The offset (the 25%'s — the 12.10.3's; the discontinuity's), the 1.0 (the Omega's — the 2.5's; the 12.10.3's), the 100-kip (the 200's — the 12's; the transferred), the 25% (the 12.10.3's — the 1.4's; the offset's), and the 2x (the 12.10.2's — the 2.0's; the connection's).
The 12.10.3's requirements
The 12.10.3 (the 25%'s — the 1.4's; the offset's), the 1.4 (the 25%'s — the 12.10.3's; the amplified's), the 1.0 (the 2.5's — the Omega's; the 12.10.3's), the 100-kip (the 12's — the 200's; the designed), and the 2x (the 2.0's — the 12.10.2's; the connection's).
Details
The 25% (the 1.4's — the 12.10.3's; the offset's), the 100-kip (the 200's — the 12's; the typical), the 1.0 (the Omega's — the 2.5's; the 12.10.3's), the 2x (the 12.10.2's — the 2.0's; the connection's), and the 12.10.3 (the 12's — the 25%'s; the transfer's). The transfer's — the 1.4's 25%; the connection's — the 2x.
The bottom line
Design transfer diaphragms per ASCE 7 12.10.3 (offsets >25% trigger 1.4x amplification, 1.0Ω₀ ≤2.5, connections at 2x force) — 100-200 kip transfers across vertical LFRS discontinuities.
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