United States Nuclear Regulatory Commission - Protecting People and the Environment

Engineering Characterization of Ground Motion: Task II: Summary Report (NUREG/CR-3805, Volume 5)

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Publication Information

Manuscript Completed: June 1986
Date Published: August 1986

Prepared by:
M.S. Power, C.-Y. Chang, I.M. Idriss, Woodward-Clyde Consultants
R.P. Kennedy, Structural Mechanics Associates, Inc.

Woodward-Clyde Consultants
Walnut Creek, CA 94596

Structural Mechanics Associates, Inc.
Newport Beach, CA 92660

NRC Job Code B6680

Office of Nuclear Regulatory Research

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This report presents the results of part of a two-task study on the engineering characterization of earthquake ground motion for nuclear power plant design. The overall objective of this research program sponsored by the U.S. Nuclear Regulatory Commission (USNRC) is to develop recommendations for methods for selecting design response spectra or acceleration time histories to be used to characterize motion at the foundation level of nuclear power plants.

Task I of the study, which is presented in Vol. 1 of NUREG/CR-3805, developed a basis for selecting design response spectra taking into account the characteristics of free-field ground motion found to be significant in causing structural damage. Task II incorporates additional considerations of effects of spatial variations of ground motions and soil-structure interaction on foundation motions and strutural response. The results of Task II are presented in Vols. 2 through 5 of NUREG/CR-3805 as follows: Vol. 2, effects of ground motion characteristics on structural response considering localized structural nonlinearities and soil-structure interaction effects; Vol. 3, observational data on spatial variations of earthquake ground motions; Vol. 4, soil-structure interaction effects on structural response; and Vol. 5, summary based on Tasks I and II studies. This report presents the results of the Vol. 5 studies.

This study was conducted under Contract No. NRC 04-80-192 with the USNRC. Woodward-Clyde Consultants (WCC) was the prime contractor for the project. Project Subcontractors were Structural Mechanics Associates, Newport Beach, California, Structural and Earthquake Engineering Consultants, Inc., Sierra Madre, California, Interpacific Technology, Inc., Oakland, California, and NCT Engineering, Inc., Lafayette, California.

Project Consultants, W. 3. Hall of the University of Illinois, Champaign, J. E. Luco of the University of California, San Diego, J. M. Roesset of the University of Texas, Austin, H. B. Seed of the University of California, Berkeley, and N. C. Tsai of NCT Engineering, Inc., Lafayette, California, provided a detailed review of a draft of the report:and made many valuable comments. J. F. Costello provided overall technical guidance and review as the technical representative of the USNRC for this research project.

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