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축방향 하중을 받는 특별직교이방성 적층복합판의 진동해석
원치문,Won, Chi Moon 한국강구조학회 2006 韓國鋼構造學會 論文集 Vol.18 No.1
본 논문에서는 축방향 하중을 받는 사변단순지지된 특별직교이방성 적층복합판의 고유진동수를 간편하게 계산하는 방법을 제시한다. 이 방법은 진동해석을 위해, 임의 방법으로 얻어질 수 있는 영향계수를 사용하며 공명상태하에서 관성력에 의한 부재의 변형된 모드 형상을 결정하는 과정으로 이루어진다. 최초에 가정된 임의의 모드 형상으로 시작하여 정확한 모드 형상이 반복적인 과정을 통해 얻어진다. 또한 ${[{\alpha}{\beta}]_r}$, ${[{\alpha}{\beta}{\beta}{\alpha}{\alpha}{\beta}]_r}$그리고 ${[{\alpha}{\beta}{\beta}{\gamma}{\alpha}{\alpha}{\beta}]_r}$와 같이 적층의 수가 증가함에 따라 ${B_1_6}$, ${B_2_6}$, ${D_1_6}$, 그리고 ${D_2_6}$ 가 무시될 수 있어서 특별직교이방성 적층복합판 이론과 본 방법을 적용할 수 있는 형태를 제시하고 이들에 대한 진동해석 결과를 제시한다. A simple but precise method of calculating the natural vibration frequencies of composite laminated plates with all-simple support and under axial loadings is presented herein. This method uses deflection influence surfaces, which can be obtained by any method for vibration analysis and member due to the inertia force under resonance condition. Beginning with an initially guessed mode shape, the exact mode shape is obtained by the process similar to iteration. In this paper, equations are given for the case of special orthotropic laminates. The same equations, however, can be used for any laminate as long as ${B_1_6}$, ${B_2_6}$, ${D_1_6}$, and ${D_2_6}$ are negligible as the number of plies increases. Some laminates that possess such properties are presented in the paper.
다양한 경계조건을 갖는 복합적층판의 간편한 고유진동수 해석방법
원치문,Won, Chi Moon 한국강구조학회 2002 韓國鋼構造學會 論文集 Vol.14 No.1
거더와 가로보를 포함하는 많은 교량시스템과 콘크리트 상판은 특별직교이방성 판처럼 거동한다. 그런데 Navier나 Levy의 해로 해결할 수 없는 경계조건을 가졌거나, 불규칙 단면을 가진 경에에 해석해를 얻기 것이 매우 어렵다. 더구나 이러한 경우, 고유치 문제에 대한 수치해법은 너무 복잡하다. 그러나 불규칙 단면을 갖는 보와 탑에 대해, 첫 번째 진동모드에 해당하는 고유진동수를 계산하는 방법이 1974년 '김'에 의해 개발되어 발표되었다. 최근에 이 방법은 2차원 문제로 확장되었고 전단변형이 고려된 복합판에 적용되어 왔다. 본 연구에서는 이 방법을 다양한 경계조건을 갖는 특별직교이방성 복합적층판에 적용하여 타당성을 검토하고 그 해석결과를 제시한다. Many of the bridge systems, including the girders and cross-beams, and concrete decks behave as the special orthotropic plates. Such systems with boundary conditions other than Navier or Levy solution types, or with irregular cross sections, analytical solution is very difficult to obtain. Numerical method for eigenvalue problems are also very much involved in seeking such a solution. A method of calculating the natural frequency corresponding to the first mode of vibration of beam and tower structures with irregular cross-sections was developed and reported by Kim in 1974. Recently, this method was extended to two dimensional problems including composite laminates, and has been applied to composite plates with shear deformation effects. In this paper, application of this method to the specially orthotropic laminated plates with various boundary condition is accomplished and the result of analysis is presented.
메타카올린을 사용한 초속경콘크리트의 초기재령에서 작업성과 압축강도 특성
원치문 ( Won Chi-moon ),김동호 ( Kim Dong-ho ),김남윤 ( Kim Nam-yun ) 한국구조물진단유지관리공학회 2018 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.22 No.1
This paper presents the findings of the study conducted to evaluate workability and compressive strength characteristics of rapid-setting concrete containing metakaolin. The experimental variable selected was the rate of cement replacement with metakaolin at 0, 5, 10, and 15 percent. The findings are summarized as follows: compared with the control specimens with no replacement rate, the workability and compressive strength of the concrete with 5% of cement replaced with metakaolin were comparable to those of control specimens at 4hours; however, at 72 hours, the compressive strength of the concrete with the same replacement rate was larger than the strength of the control specimens by 4.1%, while no increase in strength was observed at higher replacement rates, implying that the optimum replacement rate of cement with metakaolin is 5%.
첨가질량이 존재하는 변단면 4변고정 적층복합판의 진동해석
박제선,김경진,원치문,심도식,Park, Je-seon,Kim, Kyeong-jin,Won, Chi-moon,Shim, Do-sik 강원대학교 산업기술연구소 1995 産業技術硏究 Vol.15 No.-
A method of calculating the natural frequency corresponding to the first mode of vibration of beams and tower structures, with irregular cross-sections and with arbitrary boundary conditions was developed and reported by D. H. Kim in 1974. This method has been developed for two-dimensional problems including the laminated composite plates and was proved to be very effective for the plates with arbitrary boundary conditions and irregular sections. In this paper, the result of application of this method to the clamped composite plates with non-uniform cross-section and with attached point mass/masses is presented.