라텍스 개질 콘크리트의 부착강도 특성에 관한 연구

심도식,이주형 도립 강원전문대학 2000 道立 江原專門大學 論文集 Vol.3 No.-

Achieving an adequate bond between repair and overlay materials and existing concrete is a critical requirement for durable surface repairs. Repairs and overlay to concrete pavements and bridge decks frequently fail prematurely due to bond deterioration between the old concrete and repair material. It is essential that the repair and overlay material achieve a strong band to the substrate and that subsequent stresses are not sufficiently great as to cause debonding. Repairs which have bond lines in direct tension have the greatest dependency on bonding. The bond strength of latex-modified concrete to normal portland cement concrete measured with direct pull-out test. Using 250×1100×1400mm concrete slab as the base concrete, an overlay of the latex-modified concrete is applied and cured similar to bridge deck and then tested in direct pull-out. The test results not only give values of the bond strength of the overlay tested but also clearly indicate whether the failure is in the bond interface or the materials tested.

콘크리트 포장의 하중전달 평가방법연구

심도식,이주형,이종호 도립 강원전문대학 1999 道立 江原專門大學 論文集 Vol.2 No.-

This type of analysis assumes linear elastic material properties and static loading conditions. The well-known ILLI-SLAB finite element program was used for the analysis. Closed form analysis is commonly used to analyze pavement structures. This type of analysis assumes linear elastic material properties and static loading conditions. The well-known ILLI-SLAB finite element program was used for the analysis. Bonded concrete overlay analyzed the stress distribution, behavior and load carrying capacity under track load is made evaluation standard of bonded concrete overlay. The purpose of this dissertation was to develop an evaluation system at joints of jointed concrete pavement using finite element analysis Program, a sensitivity analysis was Performed using ILLI-SLAB program with a selected variables which might affect fairly to on the performance of transverse joints. The most significant variables were selected from precise analysis. It was concluded that the variables which most significantly affect to pavement deflections are the modulus of subgrade reaction(K) and the modulus of dowel/concrete interaction(G), and limiting criteria on the performance of joints at JCP are 300pci, 500,000 lb/in. respectively.

2경간 연속 철근콘크리트 슬래브교의 자유진동 해석

심도식,김경진,박제선,김덕현 대한토목학회 1998 대한토목학회 학술발표회 논문집 Vol.1998 No.1

Investigation of Tension Force in Stretch Forming of Doubly Curved Aluminum Alloy (Al5083) Sheet

심도식,백경윤,신광용,윤희석,이기용,김광호 한국정밀공학회 2016 International Journal of Precision Engineering and Vol.17 No.4

Aluminum alloys, which are suitable for lightweight applications, are being applied widely in diverse industries, especially to the external bodies of automobiles, ships, and aircraft. The external bodies of these vehicles have a three-dimensional geometric shape with various double curvatures. However, aluminum sheets with double curvatures are difficult to form because of their elastic recovery characteristic, known as the springback effect. As a consequence, the stretch-forming process is widely used to reduce the springback phenomenon and to obtain the desired quality product. In the stretch-forming process for aluminum sheets, the stretching conditions should be precisely designed to achieve high accuracy and minimum product defects. In particular, thickness reduction and elastic recovery of the formed plate must be considered during the determination of the stretching force. In this study, the deformation of an aluminum plate according to the magnitude of a tension force was analyzed and an optimal tension force proposed, while considering changes in the mechanical properties of the formed material. FE simulations and experiments show that the proposed tension force can be used to manufacture doubly curved aluminum surfaces with minimum thickness reduction and high accuracy.

Development of Process Design Program for Manufacture of Desired Shapes using Line Array Roll Set (LARS) Process

심도식,양동열,이돈진,한명수 한국정밀공학회 2013 International Journal of Precision Engineering and Vol. No.

The line array roll set (LARS) process is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. In the process, the plate is deformed incrementally as the deformation proceeds simultaneously in longitudinal and transverse directions in a stepwise manner. For the industrial application of this process, the forming information (such as bending radii) must be determined considering the springback phenomenon that is inevitable in the sheet metal forming process. In the present study, the process design program calculating forming information for the manufacture of doubly-curved plates is proposed. The calculation program using the iterative scheme has been implemented with Visual C++language. To check the validity of the developed program, experiments were carried out. From the experimental results, it has been demonstrated that the cold roll forming system has the general applicability for the manufacture of ship hull plates.

복합구조물 파괴에 대한 크기 효과의 영향

심도식,김경진,박제선,김덕현 대한토목학회 1995 대한토목학회 학술발표회 논문집 Vol.1995 No.1

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.

줄눈 콘크리트포장의 우각부 하중 해석

심도식,이주형,윤경구 도립 강원전문대학 1998 道立 江原專門大學 論文集 Vol.1 No.1

This study focused on the development of an alternative stress estimation procedure to instantly calculate the critical stresses bonded concrete pavement. Closed form analysis is commonly used to analyze pavement structures. This type of analysis assumes linear elastic material properties and static loading conditions. The well-known ILLI-SLAB finite element program was used for the analysis. Bonded concrete overlay analyzed the stress distribution, behavior and load carrying . capacity under track load is made evaluation standard of bonded concrete overlay. In the study, the following results were derived ; The properties of strength is that compress and 3-point bending strength of existing pavement is deteriorated with 184 ㎏/㎠, 59 kg/㎠ but compress and splitting tensile strength of overlay is satisfied with 465 ㎏/㎠, 45 kg/㎠. Load transfers is happen at adjacent slab by interlocking under track load. The stress distribution under interior, corner and edge load is described high loading position surrounding then loading position.

암석 제물성간의 상호 관련성에 관한 연구

심도식,박병수,이종호 도립 강원전문대학 2000 道立 江原專門大學 論文集 Vol.3 No.-

This thesis is results of research about correlations between physical characteristics of rock distributed around Kangwon Province in Korea. Experimental data obtained from laboratory and field tests have been collected and rock properties about 21 items were analyzed statistically to find correlations between them. From analyzed results, uniaxial compression strength and tensile strength are highly correlated to each other with R-squared value of 0.95, and tensile strength is about 1/10 of uniaxial compression strength. Two different rock quality classification systems of Q and RMR show a high value of correlation such as 0.92 of R-squared value since they have many common items in classifying the quality of rock mass. Relations between P-wave velocity and absorbing rate of water in rock, Q value and RQD, RQD and RMR, and unit weight of rock and P-wave velocity show relatively strong correlations with higher R-squared value than 0.85. Therefore, such correlations between rock properties can be used to evaluate the rock properties in designing structures in rock mass. However, rock properties have relatively low correlation with rock quality classification system, showing scattered distribution of data to find correlations between them, because they are quite dependent on types of rock and geological characteristics of rock mass. Therefore, classification of rock types and their locality should be performed in advance of evaluating their correlations.

불균등 단면과 첨가된 점질량이 있는 고정지지 복합판의 진동해석

심도식,원치문,박제선,김덕현 대한토목학회 1995 대한토목학회 학술발표회 논문집 Vol.1995 No.1