終局時における鋼H型断面柱部材の挙動及びその評価法

概要

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The failure mode of steel beam-columns is classified into three types ,i.e., (1) in-plane instability, (2) local buckling and (3) out-of-plane flexural-torsional instability. For practical shorter beam-columns, however, the in-plane instability may be ruled out for consideration. This study develops analytical methods which is to evaluate individually the post-local buckling and post-flexural-torsional buckling behaviors of wide-flange beam-columns. The methods are therefore able to predict their ductilities at peak strength as well as their post-peak strength behaviors. The accuracy of the solution has been verified by an experimental study. As a result, the more unstable of the two individual post-buckling predictions gives rise to a fairly good or a somewhat conservative approximation of the actual process of failure of the tested specimens. It is found through a series of computation that the ductilities which are dominated by the out-of-plane instability of various wide-flange beam-columns may be approximated by a single simple equation (36) which is a function of only a weak-axis slenderness factor and an axial force ratio.
一般社団法人日本建築学会の論文
1993-03-20