鋼構造柱梁接合部の歪集中に関する実験的研究 (その 1)

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This is the basic research for the study of characteristics of the brittle fracture of beam-to-column connections in steel structures. The purpose of this paper is to investigate the effect of the thickness of the column flange on the strain concentration of beam-to-column connections. Test specimens were small-scale ones, and they were manufactured by machineworks from the rolled steel plate (thickness 65mm, SS41). The specimens are made so as to represent the part of the tensile beam flange, and they had no stiffener. 13 Test specimens were put to a test. 10 of them were H-TYPE (a column cross section was H-shape) and 3 of them were B-TYPE (a column cross section was box-shape). The monotonously increasing load was placed on the end of the beam flange. Strain and displacement in the plastic region of the beam flange were calculated by MOIRE analysis. Summary of the results are shown below. (1) Yielding patterns of the beam flange are classified into 4 types corresponding to the thickness of the column flange and the shape of the column cross section. (2) The elasto-plastic behaviour of beam-to-column connections are influenced considerably by the ratio of the full plastic axial load of the beam flange to the load which generates the nonelastic out of plane deflection of the column flange. (3) In regard to the H-TYPE, the axial elasto-plastic strain distribution of the beam flange near the joint to the column flange is usualy in the convex state. If the column has the thick flanges, in elastic range the distribution is in the convex state and in plastic range it is in the concave state. This phenomenon is called the reversal of the strain concentration. (4) The criterion for the occurence of the reversal of the strain concentration is presented. Its results are in approximate agreement with experiment.
社団法人日本建築学会の論文
1976-07-30

鋼構造柱梁接合部の歪集中に関する実験的研究 (その 1)

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