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Analysis of Pull-out Behavior of Tunnel-type Anchorage for Suspended Bridge Using 2-D Model Tests and Numerical Analysis

2차원 모형실험 및 수치해석을 통한 현수교 터널식 앵커리지의 인발거동 특성 분석

  • Seo, Seunghwan ;
  • Park, Jaehyun ;
  • Lee, Sungjune ;
  • Chung, Moonkyung
  • 서승환 ;
  • 박재현 ;
  • 이성준 ;
  • 정문경
  • Received : 2018.10.15
  • Accepted : 2018.10.25
  • Published : 2018.10.31

Abstract

In this study, the pull-out behavior of tunnel type anchorage of suspension bridges was analyzed based on results from laboratory size model tests and numerical analysis. Tunnel type anchorage has found its applications occasionally in both domestic and oversea projects, therefore design method including failure mode and safety factor is yet to be clearly established. In an attempt to improve the design method, scaled model tests were conducted by employing simplified shapes and structure of the Ulsan grand bridge's anchorage which was the first case history of its like in Korea. In the model tests, the anchorage body and the surrounding rocks were made by using gypsum mixture. The pull-out behavior was investigated under plane strain conditions. The results of the model tests showed that the tunnel type anchorage underwent wedge shape failure. For the verification of the model tests, numerical analysis was carried out using ABAQUS, a finite element analysis program. The failure behavior predicted by numerical analysis was consistent with that by the model tests. The result of numerical analysis also showed that the effect of Poisson's ratio was negligible, and that a plugging type failure mode could occur only when the strength of the surrounding rocks was 10 times larger than that of anchorage body.

Keywords

Tunnel type anchorage;Pull-out test;Failure mode;Scaled model test;Quasi-static

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Acknowledgement

Grant : 케이블교량 글로벌 경쟁력 강화를 위한 전주기 엔지니어링 및 가설 공법 개발

Supported by : 국토교통과학기술진흥원