An elastic bearing must be strong against vertical loads and flexible against horizontal loads. However, due to the material characteristics of rubber, it may show variability due to the manufacturing process and environmental factors. If the value applied in the bridge design stage and the actual measured value have different values or if the performance during operation changes, the performance required in the design stage may not be achieved. In this paper, the seismic response of bridges was compared and analyzed by assuming a case where quality deviation occurs during construction compared to the design value for elastic bearings, which have not only always served as traditional bearings but also have had many applications in recent seismic reinforcement. The bearing's vertical stiffness and shear stiffness deviation were considered separately for the quality deviation. In order to investigate the seismic response, a time history analysis was performed using artificial seismic waves. The results confirmed that the change in the bearing's shear stiffness affects the natural period and response of the structure.

1. 서 론
2. 대상 교량
    2.1 교량 모델링
    2.2 강성 변동을 고려한 탄성받침 해석조건
    2.3 지진 하중
3. 지진응답 평가
    3.1 고유주기 비교
    3.2 받침의 전단강성 편차에 따른 지진응답 비교
    3.3 받침의 수직강성 편차에 따른 지진응답 비교
4. 결 론
감사의 글

• 윤혜진(한국건설기술연구원 구조연구본부 연구위원) | Yoon Hyejin (Research Fellow, Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology) Corresponding author
• 조창백(한국건설기술연구원 구조연구본부 수석연구원) | Cho Chang-Beck (Senior Researcher, Department of Structural Engineering Research, Korea Institute of Civil Engineering and Building Technology)
• 김영진(한국건설기술연구원 기획조정본부 선임연구위원) | Kim Young-Jin (Senior Research Fellow, Planning and Coordination Department, Korea Institute of Civil Engineering and Building Technology)
• 강준원(홍익대학교 건설환경공 학과 교수) | Kang Jun Won (Professor, Department of Civil and Environmental Engineering, Hongik University)