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4. A New Seismic Site Coefficient Model Based on Conditions in the South Carolina Coastal Plain.

Author

Aboye, Shimelies A., Andrus, Ronald D., Ravichandran, Nadarajah, Bhuiyan, Ariful H., Martin II, James R., and Harman, Nicholas E.

Subjects
COMPUTER simulation, SHEAR waves, ROCK properties, EARTHQUAKE zones
Abstract

A new seismic site coefficient model is developed in this article from the results of over 48,000 total stress, 1D equivalent linear and nonlinear ground response simulations assuming conditions at seven locations in the South Carolina Coastal Plain. Site coefficients (F) computed from the simulations are plotted versus average shear-wave velocity in the top 30 m (VS30) and grouped by location, spectral acceleration, and spectral period. In all plots, it can be seen that F increases from zero to a zone of peak values as VS30 increases from zero, and then F decreases to a value of 1 as VS30 approaches the reference soft-rock value. Variables found to be most influential on F, in addition to VS30 and spectral acceleration, are stiffness of material in the top 100 m, depth to top of rock, and frequency content of the rock outcrop motion. A mathematical model for median values of F defined by these five variables is proposed. Significant differences exist between the new seismic site coefficient model and the site coefficients commonly assumed in current seismic design codes, particularly where VS30 is < 180 m/s and where the top of the rock is at shallow depths. The new model is partially validated using data from the 1989 Loma Prieta earthquake. Because the new model is based on a broad range of soil/rock properties, it should be applicable to other areas with similar conditions and may be applicable in areas with different conditions if the model variables are appropriately calibrated or modified. [ABSTRACT FROM AUTHOR]

Published
2014
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5. Seismic site coefficients and acceleration design response spectra based on conditions in South Carolina : final report.

Author

South Carolina. Dept. of Transportation, United States. Federal Highway Administration, Andrus, Ronald D., Ravichandran, Nadarajah, Aboye, Shimelies A., Bhuiyan, Ariful H., Martin, James R. II, Clemson University. Department of Civil Engineering, South Carolina. Dept. of Transportation, United States. Federal Highway Administration, Andrus, Ronald D., Ravichandran, Nadarajah, Aboye, Shimelies A., Bhuiyan, Ariful H., Martin, James R. II, and Clemson University. Department of Civil Engineering

Abstract

SC-DOT Research Project No. 686, The simplified procedure in design codes for determining earthquake response spectra involves, estimating site coefficients to adjust available rock accelerations to site accelerations. Several, investigators have noted concerns with the site coefficients recommended in current codes, herein, called the 1994 National Earthquake Hazard Reduction Program (NEHRP) site coefficients, including (1) the suitability of the 1994 NEHRP coefficients for conditions different from Western, United States geology; (2) the appropriateness of using a single coefficient for a wide range of soil, stiffnesses; and (3) the suitability of using coefficients that are independent of depth to top of rock., This report describes a systematic ground response study to determined site coefficients (F), appropriate for South Carolina’s geologic and seismic conditions. The study involves assuming, conditions at seven locations in the Atlantic Coastal Plain and four locations in the South Carolina, Piedmont. Over 60,000 total stress, one-dimensional equivalent linear (SHAKE2000) and nonlinear, (DMOD2000) ground response simulations are conducted using numerous representative shear wave, velocity profiles and a suite of over 130 synthetic rock outcrop motions generated with the computer, program Scenario_PC assuming return periods of 475 and 2,475 years., Results of the ground response analyses are compiled into over 400 plots of computed values of, F versus average shear wave velocity in the top 100 ft (VS100ft) grouped by site location, depth to top, of soft rock (HB-C) or hard rock (HHR), spectral period (T), and spectral acceleration of the rock input, motion (Soutcrop). In nearly all the plots, the following three distinct features can be seen—(1) an, increasing trend in F as VS100ft increases from zero; (2) a zone of peak values of F; and (3) a, decreasing trend in F as VS100ft increases to the velocity of the reference rock.

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