基于PIPESTRESS的核一级辅助管道疲劳分析方法研究

摘要

为防止管道失效，RC C－M规范规定除应考虑自重、压力等载荷变化导致的应力变化外，核一级辅助管道必须考虑热膨胀和热弯曲应力变化对疲劳累积使用系数的影响。重点研究基于PIPESTRESS的核一级辅助管道疲劳分析的基本方法，并以某电站核一级辅助管道为例，通过专用管道力学分析软件PIPESTRESS确定管道在温度载荷（热膨胀、温度梯度和锚固点热位移）、压力载荷和机械载荷等交变载荷作用下各瞬态工况应力变化幅值，采用雨流计数法计算疲劳累积使用系数进行疲劳分析和评定。%In order to avoid auxiliary class 1 piping failure,thermal expansion and thermal bending stress range should be taken into consideration for evaluation of cumulative usage factor besides deadweight and pressure loadings due to RCC -M code.The fatigue behavior analysis methodology for auxiliary class 1 piping is realized by the PIPESTRESS software,and the alternating stress intensity of auxiliary class 1 pip-ing is calculated under thermal(thermal expansion,thermal gradients and thermal anchor displacements included),pressure and mechanical cycling loading conditions.And the cumulative usage factor is calcu-lated according to rainflow counting method.