Browse > Article

A Proposition of Site Coefficients and Site Classification System for Design Ground Motions at Inland of the Korean Peninsula  

Sun Chang-Guk (Highway & Transp. Tech. Inst., Korea Highway Corp.,)
Chung Choong-Ki (School of Civil, Urban & Geosystem Eng., Seoul National Univ.)
Kim Dong-Soo (Dept. of Civil & Evbironmental Eng., Korea Adanced Inst. Of Science & Tech.)
Publication Information
Journal of the Korean Geotechnical Society / v.21, no.6, 2005 , pp. 101-115 More about this Journal
Abstract
For the site characterization at two inland areas, Gyeongju and Hongsung, which represent geomorphic and geologic characteristics of inland region in Korea, in-situ seismic tests containing borehole drilling investigations and resonant column tests were peformed and site-specific seismic response analyses were conducted using equivalent linear as well as nonlinear scheme. The soil deposits in Korea were shallower and stiffer than those in western US, from which the site coefficients and site classification system in Korea were derived. Most sites were categorized as site classes C and D based on the mean shear wave velocity $(V_s)$ of the upper 30 m $(V_s30)$, ranging between 250 and 650 m/s. According to the acceleration response spectra determined from the site response analyses, the site coefficients specified in the current Korean seismic design guide underestimate the ground motion in the short-period band and overestimate the ground motion in mid-period band. These differences can be explained by the differences in the bedrock depth and the soil stiffness profile between Korea and western US. The site coefficients, $F_a$ for short-period and $F_v$ for mid-period, were re-evaluated and the site classification system, in which sites C and D were subdivided according to $V_s20,\;V_s15,\;and\;V_s10$ together with the existing $V_s30$ was introduced accounting for the local geologic conditions at inland region of the Korean peninsula. The proposed site classification system in this paper is still rudimentary and requires modification.
Keywords
Bedrock depth; Seismic design; Shear wave velocity; Site class; Asite coefficient; Site response analysis;
Citations & Related Records
연도 인용수 순위
  • Reference
1 BSSC (2000), NEHRP Recommended Provisions for Seismic Regulations for New Buildings and Other Structures, Part 1-Provisions, Building Seismic Safety Council, Washington D. C
2 Dobry, R., Ramos, R., and Power, M. S. (1999), Site Factor and Site Categories in Seismic Codes, Technical Report MCEER-99-0010, Multidisciplinary Center for Earthquake Engineering Research
3 ICBO (1997), 1997 Uniform Building Code, Volume 2 - Structural Engineering Design Provisions, International Conference of Building Officials
4 Kim, D. S., Chung, C. K., Sun, C. G., and Bang, E. S. (2002), 'Site assessment and evaluation of spatial earthquake ground motion of Kyeongju', Soil Dynamics and Earthquake Engineering, Vol.22, pp.371-387   DOI   ScienceOn
5 Borcherdt, R. D. (1994), 'Estimates of site-dependent response spectra for design (methodology and justification)', Earthquake Spectra, Vol.10, pp.617-653   DOI   ScienceOn
6 Idriss, I. M., and Sun, J. I. (1992), User's Manual for SHAKE91: A Computer Program for Conducting Equivalent Linear Seismic Response Analyses of Horizontally Layered Soil Deposits, University of California, Davis
7 건설교통부 (1999), 내진설계기준연구(II)
8 Imai, T. and Tonouchi, K. (1982), 'Correlation of N-value with S-wave Velocity and Shear Modulus', Proceedings of the 2nd European Symposium on Penetration Testing, Amsterdam, pp.57-72
9 Sun, C. G. (2004), Geotechnical Information System and Site Amplification Characteristics for Earthquake Ground Motions at Inland of the Korean Peninsula, Ph.D. Dissertation, Seoul National University
10 Bardet, J. P. and Tobita, T. (2001), NERA: A Computer Program for Nonlinear Earthquake Site Response Analyses of Layered Soil Deposits, University of Southern California
11 ANSS Technical Integration Committee (2001), Technical Guideline for the Implementation of an Advanced National Seismic System, Advanced National Seismic System, http://www.anss.org/ticplan, Accessed in 14 April 2002