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鋼部材 필렛鎔接 및 홈鎔接 連結部의 疲勞擧動에 關한 硏究
閔彰東 忠州大學校 1995 한국교통대학교 논문집 Vol.30 No.2
. Fabrication by welding may result in stress concentration regions in the joints and it may be caused by weld imperfections or geomatrical discontinuities. Thus, fatigue strength of welded details was essential for fatigue design of bridge components. In this study, constant amplitude fatigue tests on load-carrying, nonload-carrying fillet welded specimen and transverse groove welded specimen were carried out, and fatigue strength was evaluated. the effects of curvature radius ρand tangential angle θof fillet welded toe were also investigated. From the result of this study, fatigue strength of nonload-carrying fillet welded specimen was higher than that of load-carrying specimen, and smoothing weld surface in the transverse groove welded specimen improved fatigue strength. The smaller ρand θ, the higher probability of fatigue crack occurance. Thus, the effect of weld toe shape was play a role in fatigue strength and fatigue crack initiation.
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閔彰東 충주대학교 1993 한국교통대학교 논문집 Vol.27 No.-
In this study, impact fracture and fatigue behaviors of SWS 50 Steel are investigated in terms of macroscopic view. Then the fundamental data needed to trace the relationship between macroscopic and microscopic views and the data for fracture control of steel manufactured in domestic are represented.
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閔彰東,成基泰,金聖勳 충주대 산업과학기술연구소 1994 産業科學論文集 Vol.2 No.-
Quantitative evalution of the fatigue and fracture in rail steel is made the basis for predicting fatigue life and making a decision of exchange interval. In this study, tharpy V-notch behavior and fracture toughness KIC were evaluated by using of the analysis data from tharpy V-notch Test. From the results of this study. It was shown that there is no any probability of ductile fracture, but quite probability of brittle and fatigue fracture. On the other hand, fracture toughness is decreased by increasing the service year and it is not consitent in evaluation of fracture toughness for the proposed equation by pre-researcher.
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閔彰東 忠州大學校 1972 한국교통대학교 논문집 Vol.5 No.-
The static mechanic analysis of a frame structure redounds to the analysis of simple simultaneous equations. But the higher the order becomes, the more time and energy become required to obtain the analysis, value and then even if we abtained the analysis value we would not be able to distinguish the exactness of the analysis value easily. Therefore in the past we have practically used the method of analysis in which the unknown quantity of simultaneous equations was made to be less, and also we have sought only to find the way to obtain the value of simultaneous equations approximately. But nowadays owing to the development of computer, we can obtain all calcuration values easily and correctly. The method of matrix frame structure analysis is simple and clear in its theory and it is convenient for programming, the computer program. So I made an investigation on the matrix methods of structure analysis by giving a few calculation examples.
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閔彰東 忠州大學校 1978 한국교통대학교 논문집 Vol.11 No.2
As a long-span bridge we may discuss truss bridge, Arch bridge, suspension bridge and cable-stayed bridge. Among these bridges, suspension bridge are adopted as a longer-span bridge which has more than 400m span. By comparing these two styles of bridges each other, I hereby have comparatively discussed the superior aspects of cable-stayed to those of suspension bridge in view of its stiffness and stiffness and its necessary steel material.
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閔彰東 忠州大學校 1968 한국교통대학교 논문집 Vol.2 No.-
A Suspension bridge is an economical bridge which is constructed in case of the long span. Theoretic ally the author tried to determine the shape of cable, the stress, the deformation, which are the main members of this bridge ; and then in three hinge high-strength reinforce truss, one of the suspenison bridge styles, the author described to determine at what point the moment and shearing force reach the maximum, when the load act on the bridge.
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閔彰東 忠州大學校 1982 한국교통대학교 논문집 Vol.15 No.2
When we design a bridge if we use the desing live load indicated in specifcation, it is considered to be in safety side. However, the large sized and high speeded vehicles have caused over-vibration of a bridge and the changing compass of its stress wave leaves a big problem. In this paper, the writer developed the theory of vibration based on general elastic assumption to the vibration behavior of a bridge, and tried to seek not only vibration behavior with frequency of vehicle and the change of speed by using Ragrange's equation of motion but also dynamic response by using matrix structural analysis.
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閔彰東 忠州大學校 1976 한국교통대학교 논문집 Vol.8 No.1
On the safety in building bridges Almost all of the accidents in building a steel bridge will happen at the time fo its construction. Therefore it is necessary to investigate the safety at the time of bridge building. In the light of the impotrance of this fact, the author investigated the safety of bridge construction by examing the materialson the construction of steel bridge,especially the examples of the accidents happened under the construction of bridge, the conditions fo construction and the other problems.
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閔彰東 忠州大學校 1983 한국교통대학교 논문집 Vol.16 No.2
When the load acts dynamically, the deflection, the bending moment and the shearing force increase more than it acts statically. Accordingly the effect of dynamic load in design is considered by the mothod of progressive impact factor. However, it is hard to examine closely the exact valadity of that method. We developed the theory of vibration on the basis of general elasticity assumption to the vibration behavior of simple steel bridge, and calculated the deflection and the section force of each point of the beam in dynamic ioad acting on the middle of the beam. We compard these values with those from the method of progressive impact factor and those of survey to make clear the valadity of the method of progressive impact factor.
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