What Is the Fundamental Period in Seismic Design?
T (the 12.8.2's — the 0.1N's; the CuTa's) sets (the 0.1N's — the 12.8.2's; the 2's) by (the CuTa's — the 12.8.2's; the 1.4's) and (the 2's — the 12.8.2's; the cap's). The period: the 12.8.2's (the 0.1N's — the CuTa's; the 2's), the 0.1N's (the 12.8.2's — the 2's; the CuTa's), the CuTa's (the 12.8.2's — the 1.4's; the 0.1N's), and the 2's (the 12.8.2's — the cap's; the 0.1N's). The building's — the T perioded.
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How T is computed
The 0.1N (the 12.8.2's — the 2's; the CuTa's), the CuTa (the 12.8.2's — the 1.4's; the 0.1N's), the 1.4 (the Cu's — the 12.8.2's; the CuTa's), the 2 (the 12.8.2's — the cap's; the 0.1N's), and the 12.8.2 (the 0.1N's — the CuTa's; the 2's).
The CuTa's cap
The Cu (the 1.4's — the 12.8.2's; the 1.7's), the 1.4 (the 1.7's — the 12.8.2's; the Cu's), the 1.7 (the 1.4's — the 12.8.2's; the low's — the SD1's), the Ta (the 12.8.2's — the Cu's; the 0.1N's), and the 12.8.2 (the Cu's — the Ta's; the 1.4's — the 1.7's).
The 2's cap
The 2 (the 12.8.2's — the 0.1N's; the CuTa's), the 0.1N (the 2's — the 12.8.2's; the CuTa's), the CuTa (the 2's — the 12.8.2's; the 0.1N's), the 12.8.2 (the 2's — the 0.1N's; the CuTa's), and the N (the 0.1's — the 12.8.2's; the 2's). The T's — the 12.8.2's 0.1N; the Cu's — the 1.4's.
The bottom line
Compute T per ASCE 7 12.8.2 (Ta ≈ 0.1N, capped at Cu·Ta with Cu 1.4-1.7, and at 2.0s for the approximate) — T sets Cs (via SD1/T), k distribution (1.0-2.0), and drift; the period that sizes everything.
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