KSCE Journal of Civil and Environmental Engineering Research (대한토목학회논문집)

Korean Society of Civil Engeneers (대한토목학회)
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A Study on the Dynamic Behavior of Vertical Shaft in Multi-Layered Soil

다층지반에서의 수직구 동적 거동 분석

  • 김용민 (연세대학교 토목환경공학과) ;
  • 정상섬 (연세대학교 토목환경공학과) ;
  • 김경열 (한국전력공사 전력연구원) ;
  • 이용희 (한국수력원자력(주) 중앙연구원)
  • Received : 2010.08.16
  • Accepted : 2011.01.10
  • Published : 2011.08.31
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Abstract

In this study, dynamic response of a vertical shaft subjected to seismic loads was evaluated by three-dimensional Finite Element (FE) approach. The emphasis was on quantifying the ground conditions, input motions and direction of motions. A series of parametric analyses were carried out. From the results of FE analysis, more than 1.7 times increase in shear force and bending moment is obtained when the stiff layer was thinker than the soft layer. And all of the maximum values were occurred near the interface between the soil layers. The dynamic behavior of vertical shaft was significantly influenced by the different frequencies of the input motion, and normalized acceleration of surrounding soil was 3 times larger than vertical shaft.

본 연구에서는 수직구의 동적 거동특성 분석을 위하여 지반조건, 입력하중 특성, 하중 방향 등의 주요 인자를 고려하여 3차원 유한요소해석을 수행하였다. 그 결과로, 다층지반에 시공된 수직구는 하부 단단한 지층이 두꺼울수록 전단력과 휨모멘트가 최대 1.7배 크게 발생되며, 지층이 변화하는 경계면에서 가장 큰 단면력이 발생된다. 또한 입력하중의 주기 특성에 따라 수직구 동적거동은 서로 다르며, 수직구와 주변지반에서의 가속도 증폭 비율은 주변지반에서 최대 3배 이상 크게 나타났다.

Keywords

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