Development of seismic ground-motion criteria for the ASCE 7 standard

C. B. Crouse*, E. V. Leyendecker, P. G. Somerville, M. Power, W. J. Silva

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

7 Citations (Scopus)


The ground-motion section in the ASCE 7-05 standard has been revised to incorporate (1) maps of a new parameter, TL, the period on the design response spectrum separating the constant-velocity and constant-displacement segments, (2) new Maximum Considered Earthquake (MCE) ground-motion maps for the conterminous U.S., Puerto Rico (PR) and the Virgin Islands (VI), and (3) criteria for conducting site-specific ground-motion analysis including lower limits on ground motions for Site Class F soils. Values of TL are designated within irregularly shaped regions within the U.S. and are based on 2-sec deaggregation results from probabilistic seismic hazard analysis (PSHA) conducted by the U.S. Geological Survey (USGS). Although acknowledged to be imperfect, the maps are intended to provide improved estimates of ground motions for the design of long period structures. The values of short period MCE spectral acceleration, SS, and 1-sec MCE spectral acceleration, S1, for PR and VI are generally smaller than the default values of SS and S1 in the previous ASCE 7-02 standard. The new values are based on the USGS PSHA, whereas the old values were based on the judgment that PR and VI were equivalent in hazard to that represented by Zone 3 and Zone 4, respectively, of the Uniform Building Code. The new values of SS and S1 for the conterminous U.S. are generally within + 10% of the values in ASCE 7-02.

Original languageEnglish
Title of host publication8th US National Conference on Earthquake Engineering 2006
Number of pages8
Publication statusPublished - 2006
Externally publishedYes
Event8th US National Conference on Earthquake Engineering 2006 - San Francisco, CA, United States
Duration: 18 Apr 200622 Apr 2006


Other8th US National Conference on Earthquake Engineering 2006
Country/TerritoryUnited States
CitySan Francisco, CA


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