Failure Behavior of Piping Systems With Wall Thinning Under Seismic Loading
Failure Behavior of Piping Systems With Wall Thinning Under Seismic Loading
复制标题
DOI：
10.1115/pvp2002-1390
复制
发表时间：
2004-02
期刊：
影响因子：
--
通讯作者：
Izumi Nakamura;Akihito Otani;M. Shiratori
中科院分区：
文献类型：
--
作者：
Izumi Nakamura;Akihito Otani;M. Shiratori
为了研究退化对管道系统动力特性和失效模式的影响，进行了三维退化管道模型振动台试验。在管道模型中引起的退化条件是在一个或多个弯头处约50%的全周向壁变薄。通过改变管道模型中的诱导部分，制作了4种模型进行振动台试验。这些模型在相同的输入加速度下被激励，直到模型失效并导致加压内部水泄漏。通过这些试验，得到了退化管道模型振动特性的变化和失效过程。管道模型的变形倾向于集中在退化的弯头上，因此损伤集中在管道模型中最薄弱的弯头上。管道模型的失效模式是在最薄弱的弯头处的低周疲劳失效。
In order to investigate the influence of degradation on dynamic behavior and failure modes of piping systems, shaking table tests of 3-D piping models with degradation were conducted. The degradation condition induced in the piping models was about 50% full circumferential wall thinning at an elbow or elbows. By varying the induced parts in the piping model, 4 kinds of models were made for the shaking table tests. These models were excited under the same input acceleration until the models failed and caused leak of pressurized internal water. Through these tests, the change of the vibration characteristic and the process to failure of degraded piping models were obtained. The deformation of the piping models tended to concentrate on the degraded elbows, and therefore the damage concentrated to a weakest elbow in the piping models. The failure mode of the piping models was a low-cycle fatigue failure at the weakest elbow.Copyright © 2002 by ASME