What Is Seismic Design for Bridges?
Bridges (the AASHTO's — the 2020; the SGS's) are designed for (the seismic — the 1,000-year; the 7%'s) via (the SGS's — the 2020's; the SDC's) and (the 7%'s — the 75-year's; the 1,000's). The design: the SGS's (the 2020's — the SDC's; the A-D's), the SDC's (the A's — the D's; the 1,000's — the year's), the 7%'s (the 75's — the 1,000's; the 50's), and the 1,000-year (the 7%'s — the 75's; the 2,475's). The span's — the AASHTO designed.
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The SGS's SDC
The 2020 (the SGS's — the SDC's; the A-D's), the A (the minimal's — the D's; the 1,000's), the D (the highest's — the A's; the 1,000's), the 1,000-year (the 7%'s — the 75's; the 2,475's), and the 7% (the 75's — the 50's; the 1,000's).
The 1,000-year's spectra
The 7% (the 1,000's — the 75's; the 2,475's), the 2,475 (the year's — the 7%'s; the 75's), the 1.5 (the R's — the 3's; the 5's — the columns'), the 3-5 (the columns' — the R's; the 1.5's), and the 2020 (the SDC's — the SGS's; the A-D's).
Details
The 12-inch (the seat's — the 24's; the SGS's), the 24-inch (the 12's — the seat's; the 1,000's), the 1.5-5 (the R's — the columns'; the 3's), the 2020 (the A-D's — the SGS's; the SDC's), and the 7% (the 2,475's — the 1,000's; the 75's). The bridge's — the 7%'s 1,000-year; the seat's — the 24-inch.
The bottom line
Design bridges per AASHTO SGS-2020 (SDC A-D, 1,000-year/7%-in-75-yr spectra, column R 1.5-5, 24-in minimum seat width) — the 1,000-year return (vs. 2,475-yr buildings) reflects the 75-year design life.
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