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교량상판형(橋梁上板形) 적층복합판(積層復合板)의 진동수(振動數)에 대한 첨가질량(添加質量)의 영향(影響)
심도식,이세진,김경진,박제선,Sim, Do-Sik,Lee, Se-Jin,Kim, Kyung-Jin,Park, Je-Sun 강원대학교 산업기술연구소 1996 産業技術硏究 Vol.16 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. In order to obtain the natural frequency by the presented method, the first step to take is to obtain the deflection influence surfaces. In design and analysis of any structure, the first step to be taken is to obtain this deflection influence surfaces. Any method can be used for this purpose. Then using this surfaces, deflections, slopes, moments, shears, and natural frequencies can be obtained by differentiating either the continuous function or discrete function defined at certain points. The merit of the presented method is that the natural frequency can be obtained by the deflection influence surfaces obtaining which is the first step in structural analysis.
적층 복합판의 보강방향 및 형상비 변화에 따른 임계좌굴하중
심도식(Do Sik Sim),김경진(Kyeong Jin Kim),민창동(Chang Dong Min),박제선(Je Seon Park) 한국강구조학회 1996 韓國鋼構造學會誌 Vol.8 No.2
In this paper, simple formulas to obtain $quot;accurate$quot; values of the critical buckling load of certain type laminate are compared with Whitney`s equations. Also critical buckling loads of plates with varying aspect ratios and fiber orientations, are compared with critical buckling load of a beam. Even though this paper is limited to the composite laminated plates of [α/β/β/γ/α/α/β]r type, the critical buckling loads of such plates with various fiber orientations, ply numbers and plate aspect ratios, can be used by engineers for a preliminary design. This work can be a guideline to obtain data in many other cases.
불변량(不變量)과 수정계수(修正係數)를 사용(使用)한 [αββγααβ]<sub>r</sub> 적층부합판(積層復合板)의 진동해석(振動解析)
홍창우,심도식,김남윤,정영화,Hong, Chang-Woo,Sim, Do-Sik,Kim, Nam-Yun,Jung, Young-Hwa 강원대학교 산업기술연구소 1996 産業技術硏究 Vol.16 No.-
For a large scale civil and architectural structures, mainly steel, concrete and aluminum have been used and weight and corrosion of materials became a major concern. Designing with composite materials is very much complicated. Simple classical theory may yield good results for selecting "initial" sections for preliminary design. D. H. Kim proposed to use the quasi-isotropic constants by Tsai for the preliminary design of the composite primary structures for the civil construction. Also he made simple equation using correction factor. In this paper, the simple formulas developed by D. H. Kim to obtain "exact" values of the natural frequencies of [ABBCAAB]r laminate are compared with Whitney's equations. Also natural frequencies of the plate with varying aspect ratios and reinforcing fiber orientations, are compared with natural frequencies of bean. This work can be a guideline to obtain data in many other cases.
고로(高爐)슬래그 미분말(微粉末)을 사용(使用)한 라텍스개질(改質) 콘크리트의 화학적(化學的) 침식(侵蝕) 및 탄산화 특성(特性)
홍창우,정원경,심도식,Hong, Chang-Woo,Jeong, Won-Kyong,Sim, Do-Sik 한국자원리싸이클링학회 2008 資源 리싸이클링 Vol.17 No.5
본 연구에서는 고로슬래그 미분말 혼입률에 따른 라텍스개질 콘크리트의 역학적 특성과 탄산화 특성을 평가하였다. 이를 위해 라텍스 혼입률 변화(0%, 15%)와 고로슬래그 혼입률 변화(0%, 30%, 50%)를 실험변수로 하였으며, LMC와 BS-LMC의 특성분석을 위하여 압축강도, 황산, 염산에 대한 화학저항성 및 탄산가스에 의한 탄산화 촉진 시험을 실시하였다. 실험결과, 고로슬래그 혼입률이 30%일 경우 일반콘크리트와 동일한 강도발현 특성을 나타내었다. 고로슬래그 혼입율 50%의 조건은 탄산화에 의한 구조적 품질 저하가 예상되었으나 혼입률 30%이하에서는 일반콘크리트보다 우수한 탄산화 억제 효과가 있는 것으로 평가되었다. 특히 황산 및 염산용액 침지에 따른 강도저하 문제는 라텍스를 혼입함으로써 저감할 수 있었으며 탄산가스에 의한 중성화 진행도 라텍스를 혼입함으로서 개선되는 것으로 나타났다. The purpose of this study was to evaluate the effects of blast-furnace slag on chemical attack and carbonation of latex-modified concrete (LMC) and ordinary portland cement concrete as slag contents. Main experimental variables were performed latex contents (0%, 15%) and slag contents (0%, 30%, 50%). The compressive strengths, chemical attacks resistance and carbonation depth were measured to analyze the characteristic of the developed LMC and BS-LMC(latex-modified concrete added blast-furnace slag) on hardened concrete. The test results showed that compressive strength of BS-LMC with blast-furnace slag content 30% was quite similar to it of OPC without slag content. The structural quality deterioration was concerned when blast slag content was up to 50%. However, carbonation restraint of BS-LMC with blast-furnace slag 30% was bigger then that of opc. Also, the effects of added latex on OPC and BS-LMC were increased on the carbonation restraint and chemical attacks resistance.