What Is Seismic Design for Retaining Walls?
Walls (the 11.8's — the chapter's; the Mononobe's) are designed for (the seismic — the ΔPae; the 0.5's) via (the M-O's — the 1929's; the kh's) and (the 0.5's — the 11.8's; the reduction). The design: the kh's (the 0.5*SDS's — the 11.8's; the 0.2's), the ΔPae's (the M-O's — the 1929's; the 1.5x's), the 0.5's (the 11.8's — the reduction; the 0.67's), and the 1.5's (the FS's — the sliding's; the 1.1's — the seismic's). The wall's — the Mononobe-Okabe designed.
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The M-O method
The 1929 (the Mononobe's — the Okabe's; the 1926's), the kh (the 0.5*SDS's — the 11.8's; the 0.2's), the ΔPae (the 1.5x's — the static's; the seismic's — the increment), the 0.67 (the point's — the 0.6H's; the application), and the 1.5 (the FS's — the static's; the 1.1's — the seismic's).
ASCE 7 11.8
The 11.8 (the chapter's — the 0.5's; the reduction), the 0.5 (the kh's — the 0.5*SDS's; the 0.2's — the max), the 6-foot (the trigger's — the walls'; the 11.8's), the 1.1 (the FS's — the seismic's; the sliding's — the 1.5's — the static), and the 0.67 (the 0.6H's — the ΔPae's; the application).
Details
The 12-inch (the drainage's — the 1-foot's; the 11.8's), the 1.5 (the static's — the FS's; the 1.1's — the seismic's), the MSE (the 11.8's — the 0.5's; the kh's), the gravity (the 6-foot's — the 11.8's; the cantilever's), and the 1929 (the 100-year — the M-O's; the still used). The wall's — the 0.5*SDS's kh; the 1.1's seismic FS.
The bottom line
Design retaining walls per ASCE 7 11.8 (kh = 0.5·SDS ≤0.2, Mononobe-Okabe ΔPae at 0.6H, seismic FS 1.1 vs. 1.5 static) for walls 6 ft+ — provide 12-in drainage; MSE walls use the same kh.
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