AASHTO 2023 — USGS Risk-Targeted Design Spectrum

This software is preliminary or provisional and is subject to revision. It is being provided to meet the need for timely best science. The software has not received final approval by the U.S. Geological Survey (USGS). No warranty, expressed or implied, is made by the USGS or the U.S. Government as to the functionality of the software and related material nor shall the fact of release constitute any such warranty. The software is provided on the condition that neither the USGS nor the U.S. Government shall be held liable for any damages resulting from the authorized or unauthorized use of the software.Enter coordinates + Site Class + Risk Category, fetch results from USGS, and plot the two-period design spectrum.

Inputs

Latitude

Longitude

AASHTO 2023 Site Class

Title

2023 note: AASHTO 2023 uses a multi-period, risk-targeted design spectrum rather than the older 2009 two-point spectrum format.

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Results

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Project / Site

Title	—
Latitude	—
Longitude	—
Site Class	—

Selected Spectrum Ordinates

S_a(0.0 s)	—
S_a(0.2 s)	—
S_a(1.0 s)	—
No. of Spectrum Points	—

Values shown above are extracted directly from the returned AASHTO-2023 multi-period spectrum. S_a(0.0 s) is the zero-period ordinate. The complete returned spectrum should be used where the governing AASHTO procedure requires the multi-period spectrum.

AASHTO 2023 Risk-Targeted Design Spectrum

Spectrum Data

Period, T (s)	Spectral Acceleration, S_a (g)
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Raw JSON (debug)

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