Journal of the Korea Concrete Institute (콘크리트학회논문집)

Korea Concrete Institute (한국콘크리트학회)
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Response Analysis of RC Bridge Piers due In Multiple Earthquakes

연속지진하중에 의한 철근콘크리트 교량 교각의 응답해석

  • Lee Do-Hyung (Dept. of Civil and Geotechnical Engineering, Paichai University) ;
  • Jeon Jong-Su (Research and Development Institute, Sambo Engineering Co., Ltd) ;
  • Park Tae-Hyo (Dept. of Civil Engineering, Hanyang University)
  • 이도형 (배재대학교 토목환경공학과) ;
  • 전종수 ((주)삼보기술단 기술연구소) ;
  • 박대효 (한양대학교 토목공학과)
  • Published : 2004.06.01
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Abstract

In this paper, the effect of cumulative damage for reinforced concrete bridge piers subjected to both single and multiple earthquakes is investigated. For this purpose, selected are three set of accelerograms one of which represents the real successive input ground motions, recorded at the same station with three months time interval. The analytical predictions indicate that piers are in general subjected to a large number of inelastic cycles and increased ductility demand due to multiple earthquakes, and hence more damage in terms of stiffness degradation is expected to occur. In addition, displacement ductility demand demonstrates that inelastic seismic response of piers can significantly be affected by the applied input ground motion characteristics. Also evaluated is the effect of multiple earthquakes on the response with shear. Comparative studies between the cases with and without shear indicate that stiffness degradation and hence reduction in energy dissipation capacity of piers are pronounced due to the multiple earthquakes combined with shear. It is thus concluded that the effect of multiple earthquakes should be taken into account for the stability assessment of reinforced concrete bridge piers.

본 논문에서는 단일 및 연속지진하중을 받는 철근콘크리트 교량 교각의 누적손상의 영향을 조사하였다. 이 목적을 위하여 세 쌍의 입력지진파들이 선택되었고 이중 한 쌍은 3개월 간격으로 같은 지역에서 기록된 연속지진에 의한 입력지진파들을 나타낸다. 해석결과 교각들은 연속지진하중에 의하여 많은 수의 비탄성 반복주기를 경험하고 변위 연성요구도가 증가되었다. 따라서 교각들은 강성의 감소로 인한 손상이 클 것으로 사료된다. 뿐만 아니라 교각의 변위 연성요구도의 비교분석 결과, 교각의 비탄성 지진응답은 작용된 입력지진파들의 특성에 크게 영향을 받는다는 것을 알 수 있었다. 본 연구에서는 또한 연속지진하중이 전단을 고려한 응답에 미치는 영향을 조사하였다. 전단을 고려한 경우와 고려하지 않은 경우의 비교해석 결과, 연속지진하중 하에서 전단을 고려한 경우 교각의 강성저하와 그에 따른 에너지 소산능력 감소의 정도가 심각한 것을 알 수 있었다. 따라서 철근콘크리트 교량 교각의 안전성 검토에 연속지진하중의 효과가 고려되어야 할 것으로 사료된다.

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