繰り返し載荷を受ける H 形鋼はりの復元力特性 : その 1 定変位振幅繰り返し載荷時の塑性ヒンジ回転能力

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Among various patterns of failures of the steel structures subjected to cyclic loadings, the following two behaviors are emphasized. 1) Strength deterioration of a structure or its members due to an excessive deformation. 2) Fracture of members caused by low cycle plastic fatigue. In order to avoid the above failures and also evaluate the damage of the structure by various external forces, it is required to investigate quantitatively the capacity of energy absorption as well as the restoring force characteristics of structures or its members under cyclic loadings. This series of tests intends to reveal experimentally restoring force characteristics of H-Shaped steel beams under cyclic and reversed loadings, particularly of the beams with the specified sizes which are expected to failure due to local and lateral bucklings. The content of this experiment comprises four items; 1) To get a critical deflection amplitude in constant deflection amplitude cyclic loadings, up to which load-deflection hysteresis loops are stable. This critical deflection depends on various ratios of deflection amplitudes, lateral bracing spacings, material properties, and section properties of the beams. 2) To represent stable hysteresis loops in mathematical expressions deriving from experimental data. 3) To inquire into the relation between a maximum deflection amplitude and strength deterioration when beams are cycled by a random deflection. 4) To obtain the relation between strength deterioration and deflection amplitude in various ratios of deflection amplitudes in the range where hysteresis loops become unstable under constant deflection amplitude cyclic tests. Based on the results, to evaluate strength deterioration of beams subjected to random deflections. In these experiments, only a half of a beam was tested, since the stress state of a beam can be supposed as shown in Fig. 1 in the case that a structure has columns with higher stiffness and strength than those of beams. 1) and 2) are given in Part I, and 3) and 4) in Part II.
社団法人日本建築学会の論文
1978-02-28

繰り返し載荷を受ける H 形鋼はりの復元力特性 : その 1 定変位振幅繰り返し載荷時の塑性ヒンジ回転能力

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