• 제목/요약/키워드: Skewed steel box girder

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강상자형교의 전단력 산정을 위한 하중분배계수 (Load Distribution Factors for Determinating Shear Force in Steel Box Girder Bridges)

  • 송재호;김민욱;김일수;오진우
    • 한국구조물진단유지관리공학회 논문집
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    • 제15권2호
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    • pp.88-97
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    • 2011
  • 강상자형사교의 경우 국내의 도로교 설계기준이 갖추어지지 않아, 미국의 AASHTO 및 AASHTO LRFD 설계기준을 적용할 경우에는 실제의 거동과 다른 하중분배계수를 산출하게 되어 과대설계 및 과소설계를 초래할 가능성을 가지고 있다. 본 연구의 목적은 실제 거동을 바탕으로 한 강상자형 사교의 둔각부 지점에서의 전단력 산정을 위한 하중분배계수식을 제시하는 데 있다. 이를 위하여 본 연구에서는 강상자형 사교의 다양한 구조모델들에 대해 유한요소해석을 수행하고, 각 매개변수들이 강상자형사교의 하중분배계수에 미치는 영향을 분석한 후, 다중회귀분석을 수행하여 강상자형사교의 전단력 산정을 위한 하중분배계수식을 제시한다.

Fragility characteristics of skewed concrete bridges accounting for ground motion directionality

  • Jeon, Jong-Su;Choi, Eunsoo;Noh, Myung-Hyun
    • Structural Engineering and Mechanics
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    • 제63권5호
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    • pp.647-657
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    • 2017
  • To achieve this goal, two four-span concrete box-girder bridges with typical configurations of California highway bridges are selected as representative bridges: an integral abutment bridge and a seat-type abutment bridge. A detailed numerical model of the representative bridges is created in OpenSees to perform dynamic analyses. To examine the effect of earthquake incidence angle on the fragility of skewed bridges, the representative bridge models are modified with different skew angles. Dynamic analyses for all bridge models are performed for all earthquake incidence angles examined. Simulated results are used to develop demand models and component and system fragility curves for the skewed bridges. The fragility characteristics are compared with regard to earthquake incidence angle. The results suggest that the earthquake incidence angle more significantly affects the seismic demand and fragilities of the integral abutment bridge than the skewed abutment bridge. Finally, a recommendation to account for the randomness due to the ground motion directionality in the fragility assessment is made in the absence of the predetermined earthquake incidence angle.