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김운학,이주원,이석민,Kim, Woon Hak,Lee, Juwon,Lee, Seokmin 한국재난정보학회 2020 한국재난정보학회 논문집 Vol.16 No.4
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. 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.
철근(鐵筋)콘크리트 쉘구조(構造)의 비선형(非線型) 해석(解析)(II)
김운학,신현목,신현묵,Kim, Woon Hak,Shin, Hyun Mock,Shin, Hyun Mook 대한토목학회 1991 대한토목학회논문집 Vol.11 No.1
본 논문에서는 본 논문의 선행논문(先行論文)( )에서 언급한 철근콘크리트 쉘구조의 재료적(材料的) 및 기하학적(幾何學的) 비선형(非線形) 해석방법(解析方法)의 타당성을 입증하기 위해서 여러가지 수식예제(數植例題)를 해석하여 실험치와 비교, 고찰하였다. 그 결과 본 논문의 해석방법이 재료적(材料的) 및 기하학적(幾何學的) 비선형성(非線形性)을 고려한 임의형상의 철근콘크리트 쉘구조의 해석에 적합한 방법임을 입증하였다. In this paper, several numerical examples are analyzed and the results are compared with those from other reseachers to verify the applicability and the validity of the geometric and material nonliner analysis method of reinforced concrte shells refered to the paper ( ). As a results, this method is a useful tool to account for geometric and material nonlinearities in detailed analysis of reinforced concrete shells of general form.
김운학 ( Kim Woon-hak ),라정균 ( Ra Jeong-kyoun ),김태훈 ( Kim Tae-hoon ),신현목 ( Shin Hyun-mock ) 한국구조물진단유지관리공학회 2003 한국구조물진단유지관리공학회 논문집 Vol.7 No.1
This paper presents an analytical prediction of the prestress losses of prestressed concrete bridges. In this study a numerical procedure and computer program is developed to analyze the behavior of prestressed concrete bridges considering the time-dependent properties of material. It accounts for the aging, creep and shrinkage of concrete and the stress relaxation of prestressed steel. The structural model uses two dimensional plane frame elements with three nodal degree of freedom and is analyzed based on the finite element method. Member cross section can consist of concrete, reinforcement and prestressing steel. Two different set of equations for the prediction of time-dependent material properties of concrete are presented, which are ACI, CEB-FIP. The proposed numerical method for the prestress losses of prestressed concrete bridges is verified by comparison with reliable experimental results.