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2020 Vol.16, Issue 4 Preview Page

Original Article

December 2020. pp. 796-805
Abstract
Purpose: A static loading test was performed to evaluate the ultimate flexural strength of a girder in which 80MPa high-strength concrete was synthesized on the compressive flange of the I-shape steel girder. Method: This test is designed and fabricated two types of specimens with different shear-connection specifications, and evaluated their ultimate flexural behavior until reaching the extreme event limit states. In addition, the ultimate strength was evaluated by comparing the test results and the results of the strain compatibility method. Result: By confirming the displacement within 0.02mm as a result of the relative slip measurement, it was verified that the two specimens secured perfect bonding. Therefore, the difference in the shear specification does not have a great effect on the stiffness, and if the specimens are completely synthesized, there is no difference in the behavior until it reaches the extreme-event limit states. Conclusion: The girder to be tested has a working load within the elastic range and meets the usability requirements for allowable deflection. Therefore, even if a part of the casing is subjected to the tensile force at the level of cracking, the deck will first reach the compression failure due to the role of the reinforcing bar.
연구목적: I형 강거더의 압축플랜지에 80MPa급의 고강도 콘크리트가 합성된 거더의 극한휨강도 평가를 위하여 정적재하시험을 수행하였다. 연구방법: 본 실험은 전단연결 상세가 다른 2종류의 실험체를 설계 및 제작하여 극한한계상태 도달까지 극한휨거동을 평가하였다. 또 실험 결과와 변형률적합법 결과 비교를 통해 극한강도를 평가하였다. 연구결과: 상대슬립 측정 결과 0.02mm 이내 변위를 확인함으로서 두 실험체가 완전결합을 담보한다는 것을 검증하였다. 따라서 전단상세의 차이는 강성에 큰 영향을 미치지 않으며 완전합성 된다면 극한한계상태까지의 거동에도 차이가 없다. 결론: 실험 대상이 되는 거더는 사용하중이 탄성범위 내 있고, 허용처짐에 대한 사용성 요구조건을 충족시킨다. 따라서 케이싱 일부가 균열이 발생하는 수준의 인장력을 받더라도 철근의 역할로 인해 바닥판이 압축 파괴에 먼저 도달한다.
References
  1. AASHTO (2010). AASHTO LRFD Bridge Construction Specifications(3rd), US.
  2. ACI Committee 318 (2000). Building Code Requirements for Structural Concrete(ACI 318M-14) and Commentary (ACI 318RM-14), US.
  3. Lee, J.W.,Yang, I.W., Ha, T.Y., Lim, E., Lee, K,J. (2017). "Characteristics of flexural behavior of composite section consisting of steel girder with 80MPa high strength concrete on compressive flange." Journal of Society of Disaster, Vol. 13, No. 4, pp. 455-464.
  4. Lim, C.H. (2014). Evaluation for the Nominal Moment Capacity of Composite Girder Considering the Partial Safety Factor, Seoul National University of Science and Technology.
  5. Yang, I.W., Lim, E., Ha, T.Y. (2016). "Experimental study on structural behavior of interfaces of double composite girder using the 80 MPa concrete." Journal of the Korea Academia-Industrial cooperation Society, Vol. 17, No. 4, pp. 400-413. 10.5762/KAIS.2016.17.4.400
Information
  • Publisher :The Korean Society of Disaster Information
  • Publisher(Ko) :한국재난정보학회
  • Journal Title :Journal of the Society of Disaster Information
  • Journal Title(Ko) :한국재난정보학회논문집
  • Volume : 16
  • No :4
  • Pages :796-805