研究平台管节点疲劳强度的谱分析法，根据南海海况进行某新型立柱式生产储油平台桁架管节点的疲劳分析。结果表明平台桁架管节点的疲劳强度满足设计要求，而立柱的疲劳强度小于撑管的疲劳强度。分析比较撑管轴向力、面内弯矩和面外弯矩各自对疲劳损伤的贡献，结果表明斜撑管的疲劳损伤主要由轴向力造成，水平撑管的疲劳损伤主要由面内弯矩造成，而面外弯矩对撑管造成的疲劳损伤较小。
Spectral fatigue analysis method for truss tubular joints is studied and used to analyze the truss tubular joints of a new-type production and storage SPAR based on the sea condition of South China Sea. The results show that the fatigue strength of truss tubular joints of the new-type SPAR satisfies design requirement， and the fatigue strength of columns is worse than that of braces. Contributions to fatigue damage by axial force，in-plane bending moment and out-of-plane bending moment of braces are analyzed individually as well. The results show that the fatigue damage at diagonal braces is mainly caused by axial force of braces，the fatigue damage at horizontal braces is mainly caused by in-plane bending moment，while out-of-plane bending moment has little effect on fatigue damage at all braces.
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