To calculate proper seismic design load and seismic design category, the exact site class for construction site is required. At present, the average shear-wave velocity for multi-layer soil deposits is calculated by the sum of shear-wave velocities without considering of vertical relationship of the strata. In this study, the transfer function for the multi-layered soil deposits was reviewed on the basis of the wave propagation theory. Also, the transfer function was accurately verified by the finite element model and the eigenvalue analysis. Three methods for site period estimation were evaluated. The sum of shear-wave velocities underestimated the average shear-wave velocities of 526 strata with large deviations. The equation of Mexican code overestimated the average shear-wave velocities. The equation of Japanese code well estimated the average shear-wave velocities with small deviation.

A B S T R A C T
 1. 서 론
 2. 지반분류 기준
 3. 배경이론 및 해석검증
  3.1 고정단 위에 감쇠가 없는 단층지반조건에 대한 파동전달이론
  3.2 다층지반조건에 대한 파동전달이론
  3.3 국외기준의 지반주기 추정식
  3.4 유한요소해석을 이용한 전달함수 검증
 4. 526가지 다층지반조건에 대한 평균전단파속도추정
  4.1 대상지반조건
  4.2 평균전단파속도 추정 결과 및 비교
 5. 결 론
 REFERENCES

• 김동관(청주대학교 건축공학과) | Kim Dong-Kwan (Department of Architectural Engineering, Cheongju University) Corresponding author