Site response analyses were performed using the computer program SHAKE at the I-24/580/980 site to provide seismic ground motions for independent evaluations of the freeway interchange structure. Analytical models and soil parameters for SHAKE analysis were developed from geotechnical data obtained from several site investigation programs conducted at the site in 1960, 1991 and 1995. Two sets of rock outcropping input motions were used: (1) modified Santa Cruz earthquake records provided by Caltrans, and (2) LLNL synthetic strong ground motions. The LLNL synthetic ground motions were developed using LLNL Empirical Green functions method simulating strong earthquakes of moment magnitude 7.25 …
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Lawrence Livermore National Lab., CA (United States)
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Site response analyses were performed using the computer program SHAKE at the I-24/580/980 site to provide seismic ground motions for independent evaluations of the freeway interchange structure. Analytical models and soil parameters for SHAKE analysis were developed from geotechnical data obtained from several site investigation programs conducted at the site in 1960, 1991 and 1995. Two sets of rock outcropping input motions were used: (1) modified Santa Cruz earthquake records provided by Caltrans, and (2) LLNL synthetic strong ground motions. The LLNL synthetic ground motions were developed using LLNL Empirical Green functions method simulating strong earthquakes of moment magnitude 7.25 from the nearby Hayward Fault about 4 km from the site. Calculated ground surface motions using LLNL median rock input-motions are compatible with Caltrans design/evaluation motions.
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Chen, J. C.Independent seismic evaluation of the 24-580-680 south connector ramps,
report,
May 1, 1997;
California.
(https://digital.library.unt.edu/ark:/67531/metadc697392/:
accessed April 23, 2024),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.
