塑性設計梁に関する実験的研究 (1) : 等モーメントを受ける梁

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This paper is an experimental study of the inelastic steel beam under uniform morment. We know that it is useful to brace the inelastic steel beam in plastic design. But, the behavior after lateral-torsional buckling has not been explained. Then in this paper, in order to obtain the support space-versuse-the rotation capacity relationship and the influence of side span under moment gradient, we try to experiment. We experimented eleven test pieces; these test pieces have different length of span, various numbers of span and different moment distribution. We note the outline of experiments, and the result of C-2 type which show typical behavior. Further, we express the results of each type. In general, the beam under uniform moment collapes bv lateral-torsional buckling. But, the beam that is braced sufficiently closely to allow attainment M_p holds constants moment after lateral-torsional buckling untill the local buckling occures on the compression flange. The comparison between test results and the theoretical result of M.G. Lay are shown in Fig. 19. From the results, we know that equation (1-2) is usefull within the limit of the apprication of simple plastic design theory. And, from the experimental results, the value of the effectiv length factor, k, may be taken as 0.52<k<0.56, however, if the side spans are also under full plastic moment, k should be taken as 0.82<k<0.84.
社団法人日本建築学会の論文
1970-02-28