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김갑순,한병찬,성수용,김우범,정수영 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.2
In current design, the strength formula for a Gusset-Tube connections stiffened with rib-plate is proposed only in the limited case because of its complexity of the behavior. So in this study, experimental study and finite element analysis were performed to investigate the behavior and strength of a Gusset-Tube connections stiffened with rib-plate. Because of limitations in loading capacity, the specimens were fabricated with 1/3 scale of full size. Tensile coupon tests and stub column tests were also carried out. Of primary interest here are the stiffened effect of Gusset-Tube connections considering lateral force ratio, gusset plate length, eccentricity, stiffened length. Consequently, we intend to obtain accumulated database to propose practical strength equation and suggest rational reinforcing method of Gusset-tube connection.
김갑순,신의균,김우범,정수영 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1
A finite element analysis and experimental study were performed to investigate the behavior and strength of a connection of tubular steel member considering slenderness ratio and eccentricity. Primary interest here are ultimate strength of connections having eccentricity. In comparison with the current design standard according to which the gravity axes of the main and branch pipes coincide with each other, the inner eccentric joint where the gravity axes of the branch pipes are shifted to the gusset plate side can reduce the gusset plate size. However, in the eccentric joint where the gravity axes do not coincide, the bending moment that acts on the main pipe due to eccentricity causes a problem. As a result, in cases where the slenderness ratio is 40 or less, the buckling strength of the inner eccentric joint was similar to that of a joint without eccentricity. Therefore the possibility of use of inner eccentricity connection to reduce the gusset plate size has been verified.
구자갑,유범식 안성산업대학교 1998 論文集 Vol.30 No.2
This paper is to analyze the characteristics of the unconfined compression strength for improved soils. The improved soils has been selected by the laboratory mixing and the field mixing. The following conclusions are made by performing the experiments for the soil-cement wall (SCW) and the soil-cement foundation (SCF). The strength of improved soils are affected by various factors; moreover, reasonable design standards are not still available. Thus, the suitable mixing ratio should be determined to obtain the specified strength for construction sites. The relationship between the unconfined compressive strength and the aging of the improved soils may be the following equation; q_(u60) = (1.1~1.4)q_(u28) = (1.4~2.2)q_(u7) It has been found that the more long-term strength increases, the more improved materials are put in the sample soils. The confined compressive strength may be used as 7.5 kg/㎠ for the SCW and 18 kg/㎠ for SCF, respectively. Since the strength of improved soils are affected by various factors in construction sites, the field core tests and the field loading tests would be required to assure the results of this study in the project site.
조용현,조항문,현재혁,조재범,김갑수 忠南大學校 環境問題硏究所 1997 環境硏究 Vol.15 No.-
In the study , the feasibility of deposit soil in river and stream bed as a substitute for conventional plant soil was investigated through the analysis of soil characteristics and germination growth rate for 75days. Proper mix between samples from different places was compared to optimize the germination and growth rate of plant in the ratio of 2 : 1 and 3 : 1 (sand : deposit). From the results, it could be concluded that the deposit mix 3 : 1 showed most favorable germination and growth conditions for pancy and the deposit containing enough amount of silt and clay components showed most favorable conditions for marigold. Consequently, the feasibility of deposits as a substitutional plant soil was evaluated to be high.