繰返し載荷を受ける構造部材の塑性疲労-鋼板要素の破壊実験-

Abstract

An experimental study is made of the fatigue failure of structural elements in steel framesunder repeated loading. The objective is to attain the ultimate failure in the course ofloading repetitions of the order of several to ten, to try and simulate the action of destructiveearthquakes. The test specimen is a rectangular plate, representing a thin-plated element ina steel member such as wide-flange cross section. It is subjected to uniaxial loadingrepeatedly, until complete failure takes place after undergoing inelastic buckling, plasticbending, plastic elongation and/or combination thereof. The results show that the state ofthe ultimate failure is closely related to the maximum strain at the extreme fiber in the crosssection. The criterion of structural failure due to low-cycle fatigue cannot be specified by thetotal energy absorbed in plastic deformation only, but also depends on the entire history ofloading, because tensile and compressive loadings have shown to induce distinct fatiguedamage in the specimen.