鉄骨の脆性破断に及ぼす繰返し変位振幅の影響 : 鉄骨破断に関する研究その3

概要

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This study deals with effects of deflection amplitude on brittle fracture which was planed in the third series of full-scale fracture test in an extensive research project. Twelve box-section simple beam specimens were tested under cyclic loading with constant amplitude or monotonic loading, in which two types of 490MPa-tensile-strength, 25mm-thick steel plates with low and high Charpy impact energy absorption were used for the beam flanges. All the specimens resulted in brittle fracture triggered by a ductile crack generated in hot spots. As the deflection amplitude increases, the cumulative ductility prior to brittle fracture decreases approximately in inverse proportion, although the ductility of cyclically loaded specimens does not fall below that of monotonically loaded ones. Based upon the test results, proposed here are empirical formulas to adequately represent the correlation between ductility and deflection amplitude. They are also effective in evaluating the deformability of specimens subjected to cyclic loading with incremental amplitude.
社団法人日本建築学会の論文
2000-08-30