交番繰り返し軸力を受ける局部座屈崩壊型H形鋼梁の塑性変形性能

摘要

H-shaped beams installed in a braced structure are subjected to compressive and tensile forces from buckling restrained braces. In our previous paper, experiments on H-shaped beams which possess various beam sections under compressive and tensile forces were conducted. However, evaluations for the capacities of H-shaped beams under these two forces have not been scrutinized yet. In this paper, additional experiments and numerical analyses are carried out to reveal the influences of beam sections and magnitudes of axial forces on the performances. Based on the obtained results, this paper presents evaluation formulae for estimating the maximum strength, plastic deformation capacity, and cumulative plastic deformation capacity. In the end, an empirical formula to predict the Bauschinger effect coefficient is proposed to convert the cumulative plastic deformation capacity to the hysteretic energy absorption.%制振ブレース構面におけるH形鋼梁は地震時にブレースから変動軸力を受け，無軸力や一定軸力を受ける場合とは異なる履歴挙動を示すことが，既往の研究で明らかにされている。制振ブレースは，通常の座屈崩壊型ブレースと異なり，人変形領域まで安定して軸力を保持することから，梁に一定の軸力が作用し続けるため，梁の履歴吸収エネルギーに人きな影響を及ぼすものと考えられる。