Low-Cyclic Fatigue Characteristics of Hanging Bolts Used in Building Equipment
Low-Cyclic Fatigue Characteristics of Hanging Bolts Used in Building Equipment
复制标题
建筑设备用悬挂螺栓的低周疲劳特性
DOI：
10.1007/978-3-031-03811-2_27
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Shoichi Kishiki
中科院分区：
文献类型：
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作者：
Ichiro Hirano;Miku Kurosawa;Shoichi Kishiki
在2011年日本东部大地震中，有报道称，建筑设备的悬挂螺栓在连接处周围断裂，导致设备损坏失去功能。以往的研究已对循环变形引起的悬挂式螺栓的低周疲劳特性进行了研究。然而，相对较小的加载幅值范围对悬挂式螺栓疲劳特性的影响并不明显。在本研究中，我们以变形幅度、悬挂长度和公称直径为参数，对悬挂螺栓的低周疲劳特性进行了循环加载试验，明确了结构的基本行为。通过循环加载试验发现，挂杆在初始循环时的弹性刚度和屈服强度实验值与计算值基本一致。就悬挂螺栓的低周疲劳特性而言，悬挂长度越长，没有公称直径差异的循环次数越多。此外，当名义直径不同时，力学性能不同，弹性刚度和屈服强度也不同，但循环次数基本相同。
In the 2011 Great East Japan Earthquake, it has been reported that hanging bolts of building equipment are fractured around the connection and cause damage to equipment to lose its function. The low-cyclic fatigue characteristics of hanging bolts caused by cyclic deformation has been investigated in previous studies. However, effects of relatively small loading amplitude range on the fatigue characteristics of hanging bolts are not clear. In this study, we conducted cyclic loading test focusing on the low-cyclic fatigue characteristics of hanging bolts with deformation amplitude, suspension length, and nominal diameter as parameters and clarified the fundamental structural behavior. From this cyclic loading test, it was found that the experimental values of the elastic stiffness and yield strength of the hanging bolts at initial cycle were almost the same to the calculated one. Regarding the low-cyclic fatigue characteristics of the hanging bolts, the longer suspension length brought the greater number of cycles without differences of nominal diameter. In addition, it was found that when nominal diameter was different, the elastic stiffness and yield strength were varied according to mechanics, however the number of cycles were almost the same.