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原文传递 Seismic Site Coefficients and Acceleration Design Response Spectra Based on Conditions in South Carolina

题名：	Seismic Site Coefficients and Acceleration Design Response Spectra Based on Conditions in South Carolina
作者：	Andrus, R. D.; Ravichandran, N.; Aboye, S. A.; Bhuiyan, A. H.; Martin, J. R.
关键词：	South Carolina (State)##Earthquakes##Ground motion analysis##Ground response modeling##Seismic site conditions##Shear wave velocity##Recommendation##Material damping##Site Effects##Shear modules##South Carolina Department of Corrections (SCDC)##
摘要：	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.
总页数：	399
报告类型：	科技报告