What Is Structural Separation in Seismic Design?
Separation (the 12.12.3's — the δM's; the 2-inch) prevents (the pounding's — the 2's; the 12.12's) via (the δM's — the 12.12.3's; the 2's) and (the 2-inch's — the 12.12.3's; the minimum's). The separation: the 12.12.3's (the δM's — the 2's; the 2-inch's), the δM's (the 12.12.3's — the 2's; the Cd's), the 2-inch's (the 12.12.3's — the minimum's; the δM's), and the 2's (the 12.12.3's — the δM's; the 2-inch's). The buildings' — the δM separated.
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How separation works
The δM (the 12.12.3's — the 2's; the Cd's), the 2-inch (the 12.12.3's — the minimum's; the δM's), the 2 (the 12.12.3's — the δM's; the 2-inch's), the Cd (the δM's — the 12.12.3's; the 2's), and the 12.12.3 (the δM's — the 2's; the 2-inch's).
The δM's calculation
The Cd*δxe/Ie (the 12.12.3's — the δM's; the 2's), the 2 (the 12.12.3's — the 2-inch's; the δM's), the 2-inch (the 12.12.3's — the Cd's; the δM's), the 12.12.3 (the Cd's — the 2's; the 2-inch's), and the δM (the 2's — the 2-inch's; the 12.12.3's).
Pounding
The pounding (the 2's — the 12.12.3's; the δM's), the 2-inch (the δM's — the 12.12.3's; the 2's), the δM (the 2's — the 12.12.3's; the pounding's), the 12.12.3 (the 2's — the 2-inch's; the δM's), and the 2 (the pounding's — the 12.12.3's; the δM's). The separation's — the δM's 2-inch; the pounding's — the prevented.
The bottom line
Provide structural separation per ASCE 7 12.12.3 (δM = Cd·δxe/Ie each side, 2-in minimum) — prevents seismic pounding between adjacent buildings/segments; the gap grows with Cd and height.
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