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        • 노천 발파패턴에 따른 발파상수의 정량적 평가

          강성후,박선준 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

          The actual ground vibrations due to prism cut and trench cut blasting at power plant field have been measured, and the data were analyzed using reliability index(β) to the blast constants and attenuation coefficients. In this study, blast vibrations were suggested with wave component parts of ground vibration to the blast patterns, and were suggested with the division of ultimate limit state(,8 =0), serviceability limit state(β=1.28) and safety state(β =3) respectively. The reliability index 0 means 50% data line obtained by the least squares best-fit line. The reliability index 1.28 and 3 represent bounds below 90%, and 99.9% of the data, respectively. The vibration constants K(particle velocity) for prism cut were evaluated to 333, 619, 1419, respectively and the attenuation coefficients of vibrations was -1.94. From this study, inference and analysis methods of vibration equations using reliability theory were established.

        • 휨부재의 인장철근비 변화에 따른 섬유보강에폭시 판넬의 보강효과평가

          강성후,박선준,송영국 東新大學校 工業技術硏究所 2003 工業技術硏究 Vol.9 No.-

          FREP is a stiffener that is increasingly used in construction fields today. Concerning it, however, the mechanical characteristics of structures reinforced with it, reinforcement design methods, etc. have not been systematically established yet. The present study evaluated the mechanical characteristics of FREP such as fracture behavior, bending stress enhancement, etc. through a bending test using as variables steel ratio of RC beams reinforced with FREP and the thickness of FREP reinforcement. The RC Beams used in the test showed two types of fraction, which were bending tension fraction and edge stripping fracture, and when the ratio of steel ratio (ρ) to FREP ratio (ρ_(F)) is larger than 1.8, it showed edge stripping fracture. Under same reinforcement condition, if steel ratio is relatively low, reinforcement effect appeared to be high. In addition, if reinforcement thickness increases, the flexural rigidity rises and, as a result, the maximum load also increases, but an excessive increase of reinforcement thickness makes stress concentrate on the reinforced end and cause unexpected brittle fracture (edge stripping fracture) even at a light load.

        • 3경간 연속 중로식 강아치교의 내풍안정성을 고려한 라이즈 비 특성

          강성후,박선준,최명기 東新大學校 工業技術硏究所 2004 工業技術硏究 Vol.10 No.-

          The most important element is a rise ratio when regarding beauty and economics of arch bridges. Only the effect of dead load has been considered to decide the rise ratio. In this study, when going over the rise ratio of arch bridges, examined the problems, that the determination of the rise ratio by the dead load has, by adding the factor of a determination of optimum rise ratio, which is not only the effect of the dead load that has been currently considered but also the problem with respect to wind resistant dynamic stability that is now taken seriously. Synthetically, when deciding rise ratio that is investigated in basic step of design, it is not necessary to consider the evaluation wind resistant dynamic stability. Therefore the result of this research can be summarized as followes ; If it is identify oneself with rise ratio that the divided ratio due to the tie girder of the 3 continuous spans half-through steel arch bridges cannot cause a big effect in stability the wind resistant dynamic stability. If it is identify oneself with the relative stiffness ratio and girder depth ratio of the 3 continuous spans half-through steel arch bridges that the rise ratio proposes that it uses 0.10~0.30, divided ratio due to tie girder proposes that it uses 1.0~2.5 because of the wind resistant dynamic stability and the stress of the hanger. The rise ratio proposes that it uses 0.16~0.18 is given by the Japanese bridge construction association to obtained in investigation equation between an arch span length and the rise, using 0.1~0.2 at the basic design phase and the divided ratio which using 1.5 due to tie girder generally has been employed to main results and very well agrees with a research accomplishment results.

        • 3경간 중로식 아치교량의 풍하중에 대한 동적안전성

          강성후,박선준,정철호 東新大學校 工業技術硏究所 2003 工業技術硏究 Vol.9 No.-

          Recently, bridges have been momentous as not only regarding function but also concerning aesthetics. However, when beauty is considered in the design, it is also essential that stability and economics be considered. Moreover, when considering stability, an arch bridge is one of the most stable structures. The most important element is a rise ratio when regarding beauty and economics of arch bridges. Only the effect of dead load has been considered to decide the rise ratio. Therefore, in this study, when going over the rise ratio of 3-Span half through type arch bridges, I examined the problems, that the determination of the rise ratio by the dead load has, by adding the factor of a determination of optimum rise ratio, which is not only the effect of the dead load that has been currently considered but also the problem with respect to wind-resistant dynamic stability that is now taken seriously.

        • KCI등재

          실험적 방법에 의한 콘크리트 사장교의 보행자 중심 진동사용성 평가

          강성후,최봉현,박선준 한국방재학회 2011 한국방재학회논문집 Vol.11 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          In this study, the vibration serviceability of pedestrian by travelling vehicles on the cable-stayed bridge with concrete tower was studied. Experiment variables were considered travelling speed of vehicles, pavement state of asphalt on the deck and weight of vehicles, preferentially. Especially, pavement grade states were considered by A and C grades by BMS (Bridge Management System) standard. The incremental ratio extent of vibration acceleration responses, asphalt pavement grade C over A, was construed to 1.23~1.43. Only, these results are valid within extent of the Scaled-Weight 228.0~1161.9km/h·kN. The vibration equations for acceleration responses prediction of bridge deck were proposed into three types, reliability 50%, 90%, 95% respectively. These equations can consider asphalt pavement grade, and the vehicle’s weight and travelling velocity, which are the source of vibration, are combined into the term called, ‘Scaled Weight’. 본 연구에서는 콘크리트 사장교를 대상으로 차량주행속도와 교면아스팔트의 포장 상태, 차량중량 등을 실험변수로 하여 차량이 교량을 주행할 때 교면(보도)진동이 보행자에게 미치는 진동사용성 평가 방법에 대해 연구하고 그 결과로부터 진동사용성 여부를 평가하였다. 특히, 실험변수 가운데 교면포장 상태를 BMS기준에 의해 A와 C등급으로 구분하였다. 여기에는 진동을 발생시키는 에너지원을 “환산중량”으로 정의하고 차량주행 속도와 차량중량의 자승근을 곱한 형태로 사용하였다. 환산중량 228.0~1161.9km/h·kN 범위 내의 동일한 실험 조건에서 얻어진 교면포장 상태 A등급의 경우에 대한 C등급 경우의 진동가속도 응답 비율은 1.23~1.43으로 분석되어 교면포장 상태가 진동가속도 응답을 결정짓는데 큰 영향을 미치고 있음을 확인 할 수 있었다. 연구대상 교량의 교면 진동가속도 응답을 추정할 수 있는 진동추정식을 신뢰도 50%, 90%, 95%로 구분하여 제시하였으며, 실험 교량에서 교면 포장 A등급과 C등급의 경우 각각 전체응답의 30%, 40%가 레벨 C(강하게 감지)범위, 70%, 60%가 레벨 D(명확하게 감지)범위에 있는 것으로 나타났다.

        • KCI등재
        • 동적하중을 받는 콘크리트 보의 파괴거동

          강성후,김우,박선준,Kang, Sung-Hoo,Kim, Woo,Park, Sun-Joon 한국콘크리트학회 1996 콘크리트학회지 Vol.8 No.1

          본 연구는 정적 및 동적하중 재하상태에서 배합조건을 달리한 콘크리트의 파괴특성을 조사하고자 3점 휨 실험을 실시하였다. 실험은 물-시멘트비를 일정하게 유지한 상태에서 슬럼프 값을 변화시키는 경우와 슬럼프 값을 일정하게 유지하면서 물-시멘트비를 변화시키는 경우로 구분하여 배합비를 달리한 6가지 배합형태의 무근콘크리트 시편 54개를 제작하였다. 실험결과에 의하여 콘크리트의 파괴에너지(Gf)와 특성길이(lch)를 구한 수 이를 강도특성(f'c, fsp , Ec, ff)과의 상관관계를 규명하고 파괴에너지(Gf)를 이용한 배합설계의 타당성을 검토하였다.

        • 파괴에너지를 고려한 콘크리트 배합설계 프로그램

          강성후,박선준,노호현 東新大學校 工業技術硏究所 2001 工業技術硏究 Vol.7 No.-

          In the concrete structure, there are many possibilities existing cracks that are produced and developed from the infinitesimal crack in the member, fatigue or corrosion being not existing in the early period. Also, it is not enough to explain the fracutre behavior using the strength theory. Because the concrete reach to the shear due to main cracking after developing infinitesimal crack when it is received the tension stress. But it is hard to solve the structural problem of concrete, because current analysis and design methods of structure are based on the strength of concrete. Hence the subject of this thesis is programming the design of automatic mix design program to do automatic concrete mix design and to consider fracutre energy depending on mix condition.

        • 강박스 거더교 콘크리트 바닥판에 발생하는 크리이프와 건조수축에 관한 연구

          강성후,박선준,김현일 東新大學校 工業技術硏究所 2002 工業技術硏究 Vol.8 No.-

          It studies the non-structural crack factors that are produced in Steel Box Girder Bridge concrete floor plate using analytical method. It mainly studies humidity and design standard of concrete strength. It used MIDAS CIVIL Ver 5.4.0, a general structure analysis program that applies drying shrinkage rate of domestic road bridge design standard and standard value of creep coefficient, CEF-FIP standard equation and ACI standard equation from the aspect of creep, drying shrinkage and hydration heat to see the effect of the two factors on concrete crack and found the following result. The analytical results of this study showed that the initial stress, which was obtained by ACI standard, exceeds the allowable tensile stress between 5 to 18 days. This result means that even if a bridge is designed and constructed according to design standard, the bridge can have cracks due to various variables such as drying shrinkage, hydration heat and creep that produce stress in slab.

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