The steel I-girder inserted circular steel pipe is a new structural cable-anchorage system that the circular guide pipe is connected and welded to the web of the I-girder for cable-stayed bridge. This guide pipe-anchor system has many merits of the structural and aesthetic performances. However, there has been little research into the behavior mechanism with respect to anchor angles and the strengthening methods against the sectional area reduction caused by the penetration of guide pipe. Therefore, this paper investigates an experimental behavior of the steel I-girder with circular steel tube which is fabricated 1/3 scale model as fundamental study to examine the flexural behavior and failure mode in the laboratory. Based on the comparison of test results and nonlinear FE analyses, it is found that FEM is suitable to estimate the stiffness of I-girder with circular tube in order to design the cable-stayed bridge.

1. 서 론
 2. 사전변수해석
 3. 실험 모델 및 계획
  3.1 실험모델
  3.2 하중재하
  3.3 계측계획
 4. 실험결과 및 분석
  4.1 실험결과
  4.2 시사점 1: 가파른 경사의 취성파괴 유발
  4.3 시사점 2: 소성 단계의 응력집중부 변화
  4.4 시사점 3: 가이드 파이프의 변형 억제 필요
 5. 결 론
 REFERENCES

• 천경식((주)포스코건설 R&D센터 과장) | Chun Kyoung-sik Corresponding author
• 정진일(인하대학교 토목공학과 박사과정) | Jung Jin-il
• 조경식((주)디엠엔지니어링 부사장) | Cho Kyung-sik
• 황재웅((주)현대건설 인프라환경사업본부 대리) | Hwang Jae-woong