海底管道涡激振动疲劳可靠性分析

海底管道悬跨管段在波流联合作用下非常容易发生疲劳破坏，故提出管跨非线性涡激振动疲劳失效可靠性分析方法．通过多项Galerkin方法对海底管跨的涡激振动方程进行求解，获得系统的非线性动力响应；综合考虑管跨疲劳可靠性评估中相关参数和程序的不确定性，运用现代断裂力学的方法对管跨进行疲劳可靠性评估．分析了几个重要参数对管跨疲劳失效的影响程度，建立了基于裂纹扩展理论的海底管道疲劳可靠性分析的方法．通过实例计算与分析，验证了该方法的适用性和可靠性．

Fatigue Reliability Analysis of Vortex-Induced Vibration of Submarine Pipeline Span

In view of the submarine pipeline spans being vulnerable to considerable fatigue damage over its design life period due to the dynamic excitation caused by vortex-induced vibration(VIV) under wave and current,the reliability analy-sis method of nonlinear vortex-induced vibration fatigue failure of pipeline spans was proposed.The VIV equation was solved by the Galerkin method.Then fracture mechanics approaches were adopted to assess the fatigue reliability.In the assessment of fatigue failure the uncertainties associated with the parameters and procedures employed for the fatigue dam-age estimation were considered.The effects of some important factors on the fatigue failure of pipeline span was analyzed.Finally,based on the fatigue crack propagation theory,the fatigue reliability analysis method of pipeline span was estab-lished.By calculating an example,the applicability and reliability of the method were validated.