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A Study on the Bending and Seismic Performance of High Performance Cold Forming Composite Beam
최영한,김성배,홍형주,김상섭 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
Nowadays, the researches about composite structure system are being implemented in various fi elds, and many steel structures are designed based on that. In this study, the bending and seismic performance of the newly developed high-performance cold forming composite beam are evaluated by several experiments. As a result of the bending performance test, the bending moment of beam was increased stably depending on the depth and plate thickness of beam, and it is considered that the bending moment can be evaluated by the equation of a composite beam design. As a result of the seismic performance test, it was verifi ed that suffi cient seismic performance was obtained despite the increase of a negative moment rebar and depth of beam. In addition, the nominal bending moment has obtained the strength above the plastic bending moment, and also the plastic rotation angle has satisfi ed the requirement of composite intermediate moment frame.
최영한,허병욱,채지용 한국강구조학회 2022 韓國鋼構造學會 論文集 Vol.34 No.3
A support type shear connector was developed as a shear connector for the basement composite wall. A push-out test was conducted to evaluate the structural performance of the support type shear connector. The ratio of the yield load to the nominal strength without applying the reduction factor of the support type and H-steel type shear connectors was 0.85 and the ratio of the maximum load was 1.48. In addition, the ratio of the yield load to the nominal strength to which the reduction factor was applied was 1.42 and the ratio of the maximum load was 2.46. Therefore, if the length of the support type and H-steel type shear connector is 35 mm to 100 mm, it can be designed with the nominal strength without the reduction factor applied. In addition, the effect of the decrease in the load ratio according to the increase in the width-thickness ratio is not significant. 지하합성벽을 위한 전단연결재로 지지형 전단연결재(support type shear connector)를 개발하였으며, 구조성능평가를 위해 push-out 실험을 실시하였다. 지지형 전단연결재 및 H형강 실험체의 감소계수를 적용하지 않은 공칭강도에 대한 항복하중의 비는0.85, 최대하중의 비는 1.48로 나타났다. 감소계수를 적용한 공칭강도에 대한 항복하중의 비는 1.42, 최대하중의 비는 2.46으로 나타났다. 따라서 지지형 전단연결재 및 H형강의 길이가 35 mm - 100 mm라면 감소계수를 적용하지 않은 공칭강도로 설계할 수 있을 것으로판단된다. 또한 폭두께비 증가에 따른 하중비 감소의 영향은 크지 않은 것으로 판단된다.
최영한 한국수학교육학회 1968 수학교육 Vol.6 No.2
In mathematics, a definition must have authentic reasons to be defined so. On defining geometric figures, there must be adequencies in sequel and consistency in the concepts of figures, though the dimensions of them are different. So we can avoid complicated thoughts from the study of geometric property. From the texts of SMSG, UICSM and others, we can find easily that the same concepts are not kept up on defining some figures such as ray and segment on a line, angle and polygon on a plane, and polyhedral angle and polyhedron on a 3-dimensional space. And the measure of angle is not well-defined on basis of measure theory. Moreover, the concepts for interior, exterior, and frontier of each figure used in these texts are different from those of general topology and algebraic topology. To avoid such absurdness, I myself made new terms and their definitions, such as "gan" instead of angle, "polygonal region" instead of polygon, and "polyhedral solid" instead of polyhedron, where each new figure contains its interior. The scope of this work is limited to the fundamental idea, and it merely has dealt with on the concepts of measure, dimension, and topological property. In this case, the measure of a figure is a set function of it, so the concepts of measure is coincided with that of measure theory, and we can deduce the topological property for it from abstract stage. It also presents appropriate concepts required in much clearer fashion than traditional method.