Journal of the Earthquake Engineering Society of Korea (한국지진공학회논문집)

Earthquake Engineering Society of Korea (한국지진공학회)
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Seismic Response of Multiple Span Prestressed Concrete Girder Bridges in the New Madrid Seismic Zone

New Madrid 지진대의 다경간 PSC 교량의 지진거동

  • Choi, Eun-Soo (Track & Civil Engineering Research Department, Korea Railroad Research Institute) ;
  • Kim, Hak-Soo (Civil Engineering, Honam University) ;
  • Kim, Kwang-Il (Department of Civil Engineering, Hanyang University) ;
  • Cho, Byung-Wan (Department of Civil Engineering, Hanyang University)
  • Published : 2006.10.30
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Abstract

This paper evaluates the seismic response of multi-span prestressed concrete girder bridges typically found in the New Madrid Seismic Zone region of the central United States. Using detailed nonlinear analytical models and synthetic ground motion records for Memphis, TN, nonlinear response history analyses are performed for two levels of ground motion: 10% probability of exceedance (PE) in 50 years, and 2% probability of exceedance (PE) in 50 years. The results show that the bridge performance is very good fur the 10% PE in 50 years ground motion level. However, the performance for the 2% PE in 50 years ground motion is not so good because it results in highly inelastic behavior of the bridge. Impact between decks results in large ductility demands on the columns, and failure of the bearings that support the girders. It is found that making the superstructure continuous, which is commonly performed for reducing dead load moments and maintenance requirements, results in significant improvement in the seismic response of prestressed concrete girder bridges.

본 연구는 미중부지역의 New Madrid 지역에서 일반적으로 존재하는 다경간 PSC 교량의 지진거동을 평가하였다. 지진 해석은 비선형 교량모델과 인공지진파를 사용하여 수행하였으며, 인공지진파는 50년 동안 발생확률이 10%와 2%의 두 가지 수준을 사용하였다. 10%의 지진파에 대해서는 해석교량은 양호한 응답을 보였으나, 2%의 지진파에 대해서는 비선형 거동을 보이면 응답이 좋지 않았다. 바닥판사이의 충돌로 인하여 기둥의 요구량이 증가하였으며 교량받침의 파손이 발생하였다. 또한 PSC 거더를 연속화하면 매우 만족한 응답의 개선효과가 있었으며, 이러한 연속화는 유지보수의 절감 및 사하중에 의한 모멘트의 감소를 위해서 일반적으로 행해지는 것이다.

Keywords

References

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