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- 2016
基于累积损伤的张力腿平台疲劳及时变可靠性评估
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Abstract:
张力腿平台在各种恶劣海况和复杂交变载荷作用下, 平台结构疲劳破坏是结构失效的重要形式．首先, 基于累积损伤的疲劳寿命谱分析方法, 系统地建立了平台关键部位的疲劳可靠性分析方法．然后, 建立张力腿平台的整体结构模型, 计算得到其在工作海况下主体结构的应力传递函数．同时引入疲劳累积损伤增加函数, 提出了一种针对平台各关键部位的疲劳可靠性的时变性分析方法, 得到张力腿平台的时变疲劳可靠度, 并通过实例计算验证了方法的适用性和可靠性．
Tension leg platform(TLP)is vulnerable to considerable fatigue damage over its design life period under severe sea conditions and alternating loads and thus fatigue damage is an important aspect of structural failure. Firstly，spectral analysis method was employed，based on cumulative damage theory，to systematically study the fatigue reliability of the key parts of the platform. Then，the whole structural model was built and the stress transfer functions of key joints under working conditions were obtained. At the same time，the fatigue cumulative damage increasing function was introduced to analyze the time-dependent reliability of the key parts. Finally，the time-dependent reliabilities of the key parts of TLP were obtained，and applicability and reliability of the method were then verified by specific examples
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