지진하중 하에서 교량 곡률과 사각 크기에 따른 받침부의 반력 검토
Seismic Evaluation of Supporting Reactions for the Bridge with Various Curvatures and Skew Angles
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초록
본 연구에서는 LRB 받침을 갖는 플레이트 거더교를 해석 대상 교량으로 하고 편구배별 곡선반경과 사각을 해석변수로 하여 교량받침의 반력에 미치는 영향을 평가하고자 하였다. 지진파로는 El-Centro 지진 기록과 인공지진파를 각각 교축방향과 교축직각방향으로 적용하고 3D 해석을 수행하였다. 해석결과, 곡선교 내측과 예각부에서 부반력이 발생될 가능성이 높은 위치로 나타났으며, 또한, 교축 직각방향으로 지진이 작용하였을 때가 또한 가능성이 높은 조건으로 해석되었다. 그 이외에도 직선교보다는 곡선교이면서 곡률반경이 작고 사각이 작을수록 부반력의 발생 가능성이 높은 것으로 나타났다. 따라서 교량의 부반력 발생여부는 지진파의 종류 및 교량의 편구배, 곡선반경, 사각 등을종합적으로 고려하여 검토하여야 할 것으로 판단된다.
Abstract
This study has addressed to evaluate the effects of radius of curvature and skew angle on the negative reaction in a plate girder bridge withLRB (Lead Rubber Bearing) supports. As analytical parameters, various radius of curvatures and skew angles were selected and two seismic loads ofEl-Centro and artificial earthquakes were applied to the bridge in the longitudinal and transverse directions. As results of 3D analysis, the possibilityof negative reaction is shown at the part of acute angle and inner side of the curved bridge, and becomes increased when seismic load is applied in thetransverse direction. In addition, the occurrence of negative reaction is found to be increased as both radius of curvature and skew angle decrease, whichmeans that curved bridge has higher possibility of negative reaction than straight one. Conclusively, all of earthquake wave, gradient, radius of curvatureand skew angle should be considered together to investigate the possibility of negative reaction at the bridge support subject to seismic load.
참고문헌 (10)
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