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Seismic fragility of threaded Tee-joint connections in piping systems

机译:管道系统中螺纹三通接头的抗震性

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This paper proposes a methodology to evaluate seismic fragility of threaded Tee-joint connections found in typical hospital piping systems. Existing experimental data on threaded Tee-joints of various sizes subjected to monotonic and cyclic loading indicates that the "First Leak" damage state is observed predominantly due to excessive flexural deformations at the Tee-joint section. The results of the monotonic and cyclic loading tests help us evaluate the characteristics for a given pipe size and material. A non-linear finite element model for the Tee-joint system is formulated and validated with the experimental results. It is shown that the Tee-joint section can be satisfactorily modeled using non-linear rotational springs. The system-level fragility of the complete piping system corresponding to the "First Leak" damage state is determined from multiple time-history analyses using a Monte-Carlo simulation accounting for uncertainties in demand. (C) 2015 Elsevier Ltd. All rights reserved.
机译:本文提出了一种方法来评估典型医院管道系统中的螺纹三通接头的地震脆性。现有的各种尺寸的螺纹三通接头承受单调和循环载荷的实验数据表明,观察到的“第一泄漏”损坏状态主要是由于三通接头部分的过度弯曲变形所致。单调和循环载荷测试的结果有助于我们评估给定管道尺寸和材料的特性。建立了三通接头系统的非线性有限元模型,并通过实验结果进行了验证。结果表明,使用非线性旋转弹簧可以很好地模拟三通接头的截面。使用考虑到需求不确定性的蒙特卡洛模拟,通过多次时间历史分析,确定了与“首次泄漏”损坏状态相对应的完整管道系统的系统级脆弱性。 (C)2015 Elsevier Ltd.保留所有权利。

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