重力和地震荷载作用下棘轮塑性破坏的发生

IF 0.4 Q4 ENGINEERING, MECHANICAL
Satoru Kai, M. Ichimiya, N. Kasahara
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引用次数: 0

摘要

地震荷载作用下管道构件最主要的破坏形式是带棘轮的疲劳破坏。在以往的试验试验中,为了防止塑性破坏,将主应力极限应用于地震荷载。地震荷载引起的塑性破坏最早是在20世纪80年代由EPRI进行的管件动态可靠性计划(PFDRP)中确认的。但是,这种失效的机理和发生条件尚未明确。本文提出了一种棘轮破坏的复合破坏模式,它代表了棘轮变形引起的塑性破坏行为。利用识别棘轮和一阶位移破坏发生条件的地震破坏模式图解释了沿棘轮破坏模式的转变,并引入解释结构在棘轮作用下的激励条件的X-Y轨迹来投射这种转变。根据塑性破坏的X-Y轨迹和发生条件,在不进行模拟分析的情况下,从概念上提出了棘轮诱导破坏的预测方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Occurrence of plastic collapse under ratcheting due to gravity and seismic loading
The most dominant failure mode of piping components under seismic loading is fatigue failure with ratcheting. While it was confirmed via the experimental tests in the past, the Primary stress limit is applied to seismic loading to prevent plastic collapse. The plastic collapse due to seismic loading was first confirmed at Pipe-Fitting Dynamic Reliability Program (PFDRP) conducted by EPRI in 1980s. But, the mechanism and occurrence condition of this failure has not been clarified yet. In this research, a composite failure mode of the ratchet-induced collapse, which represents the behavior of the plastic collapse failure induced by ratchet deformation, is introduced. The transition of the failure modes along ratcheting is explained with the seismic failure mode map which identifies the occurrence condition of ratcheting and first-excursion failure, and the X-Y trajectory, which explains the excitation condition of structures under ratcheting, is introduced to project the transition. With the X-Y trajectory and the occurrence condition of the plastic collapse, this study conceptually proposes the prediction approach of the ratchet-induced collapse without the simulation analyses.
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来源期刊
Mechanical Engineering Journal
Mechanical Engineering Journal ENGINEERING, MECHANICAL-
自引率
20.00%
发文量
42
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