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RISS 인기검색어
- 검색키워드
- 저자 : An. Zu-Og (검색결과 29 건)
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안주옥 경희대학교 산학협력기술연구원 1996 산학협력기술연구논문집 Vol.2 No.-
An optimum design section of concrete framed structure based on the Korean Concrete Standard specifications is presented in this study. SUMT algorithm is used for numerical analysis of optimization. The optimum design section is divided framed structure into beam and column sections. As a result of numerical analysis, it was shown comparatively good results of optimum sections within 10 iterations.
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안주옥,이재성 경희대학교 산학협력기술연구원 2001 산학협력기술연구논문집 Vol.7 No.-
The objective of this study is to investigate the behavior of reinforced concrete cobels. In ACI building code, shear-friction analogy has been suggested for span-to-depth ratio less than 1.0, regardless of the failure mechanism of cobels. However, based on our analysis results, it is resonable to apply the shear-friction analogy for a/d ≤ 0.5 and strut-and-tie method for 0.5 < a/d ≤ 1.
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安主玉 慶熙大學校 1992 論文集 Vol.21 No.-
This paper intend to compare the numerical results of the dynamic analysis of arch subject to initial eccentric axial forces. In this study, subspace iteration method is performed in order to estimate frequency analysis. The time history respone for each type of arch is calculated by mode superposition. The arch models which are used for numerical analysis are circular & parabolic arch with and without initial eccentric axial forces.
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안주옥,김재하 경희대학교 산학협력기술연구원 2000 산학협력기술연구논문집 Vol.6 No.-
The procedure is computed by a set of points for a constant ratio of bending moments on the three dimensional failure surface and plots the resulting interaction diagram by using computer program「Column」. In this study, the computer program 「Column」 is developed for the nonlinear analysis of arbitrary reinforced concrete sections subjected to axial force and biaxial bending moments. A numerical procedure is performed by an exact analysis based on Davister Method for reinforced concrete columns subjected simultaneously to a combination of axial force and biaxial bending moments. The interaction curve is obtained for the various types (rectangular shape, L-shape and T-shape) of reinforced concrete columns in this study.
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안주옥,김현삼 경희대학교 산학협력기술연구원 1998 산학협력기술연구논문집 Vol.4 No.-
Because cross-section of Prestressed Concrete Box Girder Bridge is usually a closed section, its transverse, longitudinal flexural rigidity and elastic stability are very high. Hence, the bridge is very safe and stable during construction and use, and frequently used in these days. It can be applied with advantages to 60=70m span and curved bridges that have a lot of torsional moments. The Box Girder Bridge transmits the upper weight to a pier and abutment through diaphragm built inside the box girder, and prevents the section deformation by increasing the cross-section stiffness. But, the diaphragm, which includes geometric and static discontinuity, causes a lot of problems to be accurately analyzed and reasonably designed only with Korean Design Codes. When a prestressed force ia applied directly to a diaphragm, a large tension force is built up opposite side and lower part of anchorage zone, which causes bursting stress. Cracks around the anchorage zone are found because of bursting stress. The bursting stress and the tension around the diaphragm are not considered in the Korean Design Code. Hence, the prestress transferring mechanism, the analysis of End Strut and the stability of Lower Corner, are needed to study. Analysis using Strut-and-Tie Model has been performed to transverse analysis of diaphragm. An accurate structural analysis about the anchorage zone has been performed by a jStrut-and-Tie Model based on Area-AASHTO and CEB-FIP code, and their results has been compared with those of the Korean Design Code. It has been found that the Korean Design Code underestimates the shear strength of concrete.
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안주옥,임정열 경희대학교 산학협력기술연구원 1998 산학협력기술연구논문집 Vol.4 No.-
The nonlinearity of a cable-stayed bridge results in the large displacement of main girder due to a long span, the large axial forces reduce the catenary action of cables and the flexural stiffness. Therefore, th static and dynamic behavior of pylon for a cable-stayed bridge plays an important role in determining its safety. This study was performed to find the behavior of pylon of cable-stayed bridge for the first-order analysis considering of axial load only and for the second-order analysis considering of lateral deflection due to axial load. The axial force and moment values of pylon were different from the results of the first-order analysis and second-order analysis according to pylon shape and cross beam stiffness when the pylon was subjected to earthquake and wind loads. In te second-order analysis, comparing the numerical values of the member forces for the dynamic analysis, type 3 and 4(A type_ were relatively more advantageons types than types 1 and 2 (H type). considering the stability for pylon of cable-stayed bridge(whole structural system), types 3 and 4(A type) with pre-bucking of girder were proper types than types 1 and 2(H type) with buckling of pylon.
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안주옥 경희대학교 환경연구소 1993 環境硏究 論文集 Vol.4 No.-
The buckling loads of parabolic, circular, catenary and fixed arches with pinned and fixed were calculated using the subspace iteration procedures. In this study, linearized buckling analysis by using the geometric stiffness in due consideration of the effect of moment was obtaind comparatively good results.
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安主玉 慶熙大學校 1986 論文集 Vol.15 No.-
Numerical Analysis is performed to obtain the optimal size of counterfort retaining wall. As a result of the numerical Analysis, the optimal size can be easily obtained. The most economical spacing of the counterforts appears to be from 1/(2.4) to 1/(1.6) the height of the wall. And an efficient design optimization program is developed.
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持續荷重을 고려한 鐵筋 콘크리트 長柱의 휨剛性 特性의 考察
안주옥,최훈 경희대학교 산학협력기술연구원 1997 산학협력기술연구논문집 Vol.3 No.-
It is difficult to calculate the flexural rigidity of reinforced concrete slender columns under sustained load that will reasonably approximate the variations in stiffness due to creep of the concrete stress-strain curve. In this study, the initial and creep strain were calculated by use of Age-adjusted effective modulus method. Then, the column stiffness was estimated by moment-curvature relationships. This paper is presented a statistical evaluation of the stiffness parameters for use in the design of reinforced concrete slender columns subjected to sustained loads. It is recommended that the creep factor β_d used in current moment magnifier method should be concerned with the parameters affecting creep.
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