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Dynamic Analysis of Structure-Fluid-Soil Interaction Problem of a Bridge Subjected to Seismic-Load Using Finite Element Method

유한요소법을 이용한 지진하중을 받는 교량의 구조물-유체-지반 동적 상호작용해석

  • 류희룡 (농촌진흥청 원예연구소 시설원예시험장) ;
  • 박영택 (전북대학교 농업생명과학대학 생물자원시스템공학부) ;
  • 이재영 (전북대학교 농업생명과학대학 생물자원시스템공학부)
  • Published : 2008.07.31

Abstract

In construction facilities such as bridges, the fluid boundary layer(or water film) is formed at the structure-soil interface by the inflow into the system due to rainfall or/and rising ground-water. As a result, the structure-soil interaction(SSI) state changes into the structure-fluid-soil interaction(SFSI) state. In general, construction facilities may be endangered by the inflow of water into the soil foundation. Thus, it is important to predict the dynamic SFSI responses accurately so that the facilities may be properly designed against such dangers. It is desired to have the robust tools of attaining such a purpose. However, there has not been any report of a method for the SFSI analyses. The objective of this study is to propose an efficient method of finite element modelling using the new interface element named hybrid interface element capable of giving reasonable predictions of the dynamic SFSI response. This element enables the simulation of the limited normal tensile resistance and the tangential hydro-plane behaviour, which has not been preceded in the previous studies. The hybrid interface element was tested numerically for its validity and employed in the analysis of SFSI responses of the continuous bridge subjected to seismic load under rainfall or/and rising ground-water condition. It showed that dynamic responses of the continuous bridge resting on direct foundation may be amplified under rainfall condition and consequently lead to significant variation of stresses.

Keywords

References

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