What Is Seismic Design for Retaining Structures?
Retaining (the 11.8's — the M-O's; the 1929) is designed for (the ΔPae's — the 0.5's; the kh's) via (the 1929's — the Mononobe's; the Okabe's) and (the 11.8's — the 0.5's; the 0.67's). The design: the 11.8's (the 0.5's — the kh's; the 0.2's), the M-O's (the 1929's — the ΔPae's; the 1.5x's), the 0.5's (the 11.8's — the 0.5*SDS's; the 0.2's), and the 1.5x's (the ΔPae's — the M-O's; the static's). The soil's — the M-O retained.
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The M-O's method
The 1929 (the Mononobe's — the Okabe's; the 1926's), the 0.5*SDS (the kh's — the 11.8's; the 0.2's), the ΔPae (the 1.5x's — the static's; the M-O's), the 0.6H (the 0.67's — the ΔPae's; the application), and the 1.5x (the M-O's — the ΔPae's; the static's).
The 11.8's scope
The 11.8 (the 0.5's — the 0.2's; the kh's), the 0.2 (the max's — the 0.5's; the kh's), the 6-foot (the 11.8's — the trigger's; the walls'), the 1.1 (the 1.5's — the FS's; the seismic's), and the 1929 (the M-O's — the 100-year's; the still used).
Details
The 0.6H (the 0.67's — the 11.8's; the ΔPae's), the 1.1 (the seismic's — the 1.5's; the FS's), the 12-inch (the 11.8's — the drainage's; the 1-foot's), the 1929 (the 100-year — the M-O's; the 11.8's), and the 0.5*SDS (the 0.2's — the 11.8's; the kh's). The retaining's — the 0.5*SDS's kh; the ΔPae's — the 0.6H.
The bottom line
Design retaining structures per ASCE 7 11.8 (kh = 0.5·SDS ≤0.2, Mononobe-Okabe 1929 ΔPae at 0.6H, seismic FS 1.1) for walls 6 ft+ — 12-in drainage; the 100-year-old M-O method still governs.
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