In this study, considering the expansion/contraction behavior of the upper structure at all times and the abnormal behavior of the receiving friction elements that allow horizontal movement during earthquakes, a port receiving test body simulating the protrusion of the friction elements was created and the modulus performance was evaluated. In order to confirm the influence of the friction element's projection, the friction element's degree of separation was divided into four stages, and the shear behavior of the test specimen and the friction coefficient were confirmed. As a result of the experiment, it was found that the friction load increases as the protrusion degree of the friction element increases. On the other hand, as the degree of protrusion of the coefficient of friction increases, the coefficient of friction also increases. It was confirmed that damage to the friction elements during use increases the coefficient of friction, hinders smooth expansion and contraction of the upper structure, and causes stress concentration at the fixed-end support.

1. 서 론
2. 공용 중 교량받침부 결함 사례 조사
    2.1 포트받침 마찰요소 돌출
    2.2 마찰형 지진격리받침 특수 마찰요소 이탈·파손
    2.3 앵커볼트 설치 누락 및 파손
3. 실험 계획 및 방법
    3.1 실험체 구성
    3.2 실험 방법
4. 실험 결과
    4.1 압축-전단 실험 결과
    4.2 마찰요소 돌출 정도에 따른 마찰계수
5. 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)