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        검색결과 6

        1.
        2020.08 KCI 등재 구독 인증기관 무료, 개인회원 유료
        Load carrying capacity(LCC) can be reduced from its design value as a result of film thickness change when a journal is misaligned and some part of bearing is unintentionally translated. In this study, the numerical solution of the incompressible Reynolds equation was obtained by using the finite difference method and mass conservation algorithm (JFO boundary condition) with periodic pressure distribution in circumferential direction to analyze the change of LCC due to journal misalignment and step change of film thickness in axial direction for a journal bearing of vertical pumps. Smallest LCC in each eccentricity ratio is obtained as two angular positions are changed – an angular position where misalignment occurs, and another angular position where the axial step takes place while the degree of misalignment is fixed at 90%. Compared with the reaction force of plain journal bearing, the LCC reduced as much as 26.7% due to geometric effects of journal bearing at the eccentricity ratio of 0.9, while the step height is no higher than 0.1 times of bearing clearance.
        4,000원
        2.
        2016.12 KCI 등재 구독 인증기관 무료, 개인회원 유료
        OBJECTIVES : The objective of this study is to analyze the nonlinear behavior of block pavements using multi-load level falling weight deflectometer (FWD) deflections. METHODS: Recently, block pavements are employed not only in sidewalks, but also in roadways. For the application of block pavements in roadways, the structural capacities of subbase and subgrade are important factors that support the carry traffic load. Multi-load level FWD testing was conducted on block pavements to analyze their nonlinear behavior. The deflection ratio due to the increase in load was analyzed to estimate the nonlinearity of block pavements. Finite element method with nonlinear soil model was applied to simulate the actual nonlinear behavior of the block pavement under different levels of load. RESULTS: The results of the FWD testing show that the center deflections in block pavements are approximately ten times greater than that in asphalt pavements. The deflection ratios of the block pavement due to the increase in the load range from 1.2 to 1.5, indicating that the deflection increased by 20~50%. The material coefficients of the nonlinear soil model were determined by comparing the measured deflections with the predicted deflections using the finite element method. CONCLUSIONS: In this study, the nonlinear behavior of block pavements was reviewed using multi-load level FWD testing. The deflection ratio proposed in this study can estimate the nonlinearity of block pavements. The use of nonlinear soil model in subbase and subgrade increases the accuracy of predicting deflections in finite element method.
        4,000원
        4.
        2019.10 서비스 종료(열람 제한)
        본 연구는 U형 복합보의 구조적 성능을 파악하기 위해 실험을 실시하였으며, 각 실험체의 휨 성능에 대한 실험값과 이론 값을 비교하였다. U형 복합보 단부에는 H 형강이 설치되고 중앙부분에는 U 형강이 설치되기 때문에 H 형강과 U 형강이 만나는 접합부에서의 원활한 응력전달이 중요하다. U형 복합보는 크게 3개 부분(U형보 단부의 H형강 부분, H형강과 U형보 가 만나는 부분, U형보만 존재하는 중앙부분) 구분할 수 있으며, U형 복합보의 중앙부와 하중작용점에 부착된 변형게이지의 변형률 값을 비교하여 중심축을 하중 단계별로 확인하였으며, 실험체의 하중단계별 변형률 분포를 확인하였다.
        5.
        2014.04 서비스 종료(열람 제한)
        In this paper, construction staged-analysis is introduced to understand how the additional loads transfer to existing and added piles. Added piles are not able to take on the existing load due to mechanical problem.
        6.
        2009.07 KCI 등재 서비스 종료(열람 제한)
        본 연구는 다단계 온도프리스트레싱 공법으로 보강된 합성보의 하중재하 실험 및 구조해석을 통하여 온도프리스트레싱 공법의 프리스트레스 도입효과와 단면증가효과를 평가하였다. 연구결과 온도프리스트레싱을 이용한 합성보의 보강공법은 온도프리스트레싱에 의한 프리스트레스 도입 뿐 아니라 커버플레이트의 설치에 의한 단면증가로 합성보의 처짐 또한 감소시킬 수 있으므로 합성보의 효율적인 보강공법으로 적용이 가능할 것이다.