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김우범(Woo Bum Kim) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.2
A simple "engineering" method was formulated for computing the ultimate strength of end restrained tubular column damaged by a dent or out-of-straightness. The method establishes the load-shortening response of damaged members for various end restraints. The load-shortening response was obtained through the numerical integration technique using the moment-thrust-rotation and shortening-thrust-rotation relationship based on the previous research. To investigate the effect of influential parameters on column strength, such as diameter-thickness ratio, depth of dent and end restraints, a parametric study was performed efficiently by the proposed method. Also column curves of a damaged member were established for the various end restraints and an effective length factor of damaged columns was introduced. The results of the proposed method were compared with experimental results for the limited cases.
손상된 관형부재의 모멘트-곡률 관계식 유도에 관한 연구
김우범(Woo Bum Kim) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.4
A method for analyzing the behavior and strength of damaged tubular segment was developed. In developing a reliable and efficient analytical method, finite element analysis on a dented segment was made, and the m-p-φ relationship for each specific dent geometry was obtained. Then, a database of the relationship of various dent geometries was created. To generalize the relationship between M, P, φ, D/t, d/D, and σ_y, regression analysis was performed. Then, the functional relationship between M(moment) and other parameters was determined. Through the reduction process, the end moment of the dented segment was expressed in terms of axial force and rotation only. This pre-determined M-P-θ relationship are used in the numerical integration of the member. Separate comparisons between analytical and experimental results were made for the M-P-θ curves of the dented segment.
김우범(Woo Bum Kim),임경택(Kyung Teak Lim),조용기(Yong Ki Cho) 한국강구조학회 1995 韓國鋼構造學會誌 Vol.7 No.2
An experimental study was performed to investigate the behavior and strength of the connection of tubular member subjected to eccentric loading. To measure the ultimate strength of the connection subjected vertical and lateral forces, testing bed was equipped with three directional loading unit. Because of limitations in loading capacity, the specimens were fabricated with ⅓ scale of full size. To investigate material properties of specimens, tensile coupon tests and stub column tests were also carried out. Primary interest here are the ultimate strength of connections having eccentricity. From several reports and test results, main reasons of local buckling and local plastic deformation of tubular members were reviewed and the influence of degree of eccentricity on the ultimate strength was investigated. Consideration was also given to the effect of D/t raito of a tube on the local buckling strength.
SC(강판-콘크리트)구조 브라켓 접합부 거동에 관한 연구
김우범,김강식,Kim, Woo Bum,Kim, Kang Sik 한국강구조학회 2004 韓國鋼構造學會 論文集 Vol.16 No.3
본 논문에서는 강판-콘크리트 벽체구조에 부착되는 기기를 지지하기 위하여 설치되는 지지대와 벽채와의 접합 성능을 파악하기 위하여 구조실험 및 유한요소해석을 수행하였다. 구조실험은 9개의 시험체를 제작하여 파괴모드 및 최대내력을 파악하였으며 유한요소해석모델을 작성하여 이를 실험결과와 비교 검증한 후 강판두께, 스터드 볼트 간격, 지지대의 위치 및 크기 등의 영향인자가 벽체 접합부의 거동 및 내력에 미치는 변화를 살펴보았다. 해석 시험체의 하중-변형의 관계로부터 시험체의 항복내력 및 최대내력을 정의 하였으며 향후 항복선 해석을 위한 토대를 마련하였다. An experimental and analytical study on the behavior of the wall-support joint in SC(steel plate-concrete) structure was performed. Nine full-scale specimens were tested with a horizontal monotonic load, all acting in the same plane, causing a uni-axial moment on the SC structure's wall-support beam joint. The main focus is to examine thenonlinear behavior and ultimate strength of the SC wall-support joint. The effects of parameters, such aslocation of support, thickness of the steel plate, and size of support, were studied. The yield strength and ultimate strength of the plate-concrete wall was defined by examining the load-deflection relationship, showing the tension membrane action.
단부 구속을 받는 리브 보강 플레이트 원형강관 X형 접합부의 극한내력 도출에 관한 연구
김우범,박현호,Kim, Woo-Bum,Park, Hyun-Ho 한국강구조학회 2012 韓國鋼構造學會 論文集 Vol.24 No.4
본 연구의 목적은 리브 보강된 강관 접합부의 유한요소 해석을 통하여 접합부의 극한강도를 추정하고 그 거동을 파악하는 것이다. 가셋트 강관 접합부의 강도는 관벽 모멘트에 의한 국부적인 응력집중 및 국부 소성화에 의해 크게 저하된다. 이러한 국부적인 응력분포를 재분배 시킬 목적으로 가셋트 상하 단부에 보강플레이트를 부착하고 있다. 이러한 접합부의 거동은 보강된 리브의 형상 및 보강 방법등에 따라 보강하지 않은 경우와 상당히 다르지만 현행 강관구조 설계식은 제한적인 부분만 다루고 있다. 따라서 본 연구에서는 ABAQUS 6.5.1을 사용하여 리브로 보강된 가셋트-강관 접합부의 거동과 구조적 성능을 파악하고 기존 접합부 내력식과 비교하여 리브 보강된 플레이트 원형 강관 X형 접합부에 적합한 내력식을 제안하고자 한다. A finite element analysis study was performed to investigate the behavior and strength of a Plate-Circular Hollow Section joint stiffened with Rib-plate, Since The strength of plate-Circular Section joint is reduced by joint of stress and local plastic deformation which is caused by wall moment, rib plates are attached to the upper and lower Plate-Circular Hollow Section joint for redistribution of stress. The behaviors of joints stiffened with Rib-plate according to shape of rib and reinforcing method, etc are different from those of joints which is not stiffened. However, the criterion of hollow structural section was limited on some parts. Therefore, this study intends to investigate the behavior and structural capacity of Plate-Circular Hollow Section joints stiffened with Rib-plate and compare the Finite element analysis with the Design Equation. Finally, this study proposes the reasonable ultimate strength formula through the comparisons with other design guide.