논문 상세보기
There are differences in seismic behavior between non-skewed bridges and skewed bridges due to in-plane rotations caused by pounding between the skewed deck and its abutments during strong earthquake. Many advances have been made in developing design codes and guidelines for dynamic analyses of non-skewed bridges. However, there remain significant uncertainties with regard to the structural response of skewed bridges caused by unusual seismic response characteristics. The purpose of this study is performing non-linear time history analysis of the bridges using abutment-soil interaction model considering pounding between the skewed deck and its abutments, and analyzing global seismic behavior characteristics of the skewed bridges to assess the possibility of unseating. Refined bridge model with abutment back fill, shear key and elastomeric bearing was developed using non-linear spring element. In order to evaluate the amplification of longitudinal and transverse displacement response, non-linear time history analysis was performed for single span bridges. Far-fault and near-fault ground motions were used as input ground motions. According to each parameter, seismic behavior of skewed bridges was evaluated.
2. 교대-지반 상호작용 모델
2.1 선형 모델(Linear Model)
2.2 이중선형 모델(Bilinear Model)
2.3 쌍곡선 모델(HFD Model)
3. 교량시스템모델 및 지반운동
3.1 예제교량
3.2 교대 뒤채움지반 모델
3.3 전단키 모델
3.4 탄성받침 모델
3.5 입력지진파 선정
4. 교량해석 및 결과검토
4.1 면내회전 응답
4.2 교축방향 변위응답
4.3 교축직각방향 변위응답
5. 결 론
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