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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.
김우범,이영정,김갑순,정수영,Kim, Woo Bum,Lee, Young Jung,Kim, Kap Sun,Chung, Soo Young 한국강구조학회 2001 韓國鋼構造學會 論文集 Vol.13 No.6
리브로 보강된 가셋트-강관 접합부의 거동은 매우 복잡한 양상을 나타내므로 이론적인 방법으로는 극한강도평가가 불가능하다. 그러므로 본 연구에서는 리브로 보강된 K형 가셋트-강관접합부의 유한요소 해석결과를 실험결과와 비교 분석하여 그 타당성을 입증하고, 유한요소해석에 의한 접합부의 거동을 파악하고 극한강도를 추정하였다. 또한 횡력비, 편심률, 가셋트 길이를 고려한 유한요소해석으로부터 보강효과를 파악하였으며, 보강플레이트의 길이, 높이, 두께의 변화에 따른 해석을 수행하여 합리적인 보강방법을 제안하였다. It is almost impossible to evaluate the ultimate strength theoretically, because the behavior of Gusset-Tube connection stiffened with rib-plate is considerably complicate. Therefore in this study a finite element model of gusset-tube connection stiffened with rib-plate was established. The validity of finite element analysis was examined through comparing with previous experimental result and the behavior and strength of the connection was examined. From the parametric study considering lateral force ratio, eccentricity, gusset length based on finite element model, the stiffened effect was estimated and stiffening method was proposed.
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.
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.