摘要
对随机波浪荷载作用下海洋平台结构动力响应和疲劳寿命评估理论作了简要叙述,通过对某深水导管架平台经损伤加固维修后整体结构的随机动力响应分析,应用随机波浪谱和线性疲劳累积损伤理论,进行了导管架结构构件和管节点的详细疲劳寿命评估,计算模型充分考虑了对平台结构动力性能和疲劳寿命有着显著影响的附属结构和质量,以及结构-桩-土的相互作用.计算结果表明,海洋平台结构的一阶模态对动力响应起主导作用;与受损构件相连接的构件疲劳寿命与损伤前相比有明显的降低,但都满足设计使用要求;频率数和频带宽的合理选取对随机波浪动力荷载作用下结构的响应有着显著的影响.
The theory on the dynamic response and fatigue life evaluation for offshore platform structures under stochastic wave loads was summarized. The stochastic dynamic responses of a deep-water damaged jacket platform structure that had been repaired and strengthened were investigated. The fatigue life of the members and tubular joints of the jacket structure was evaluated by using wave spectrum analysis theory and theory of linear cumulative damage. The accessory structures and added mass that evident have effect on the dynamic characteristics and fatigue life of platform structures were included in the numerical calculation model. The soil reaction was modelled as reaction spring and damper. The results showed that the first-order mode of offshore platform structures provides primary contribution to the dynamic response, that the fatigue life of the members being connected with the damaged member is obviously decreased in contrast to non-damaged conditions, that they all satisfied with operating requirements in the designed life term, and that appropriate selection of frequency and bandwidth has remarkable effect on the structural re- sponse analysis. The stochastic wave spectrum analysis technique is reasonable and feasible.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2007年第1期12-17,共6页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(59895410
59779002)
海洋石油工程股份有限公司资助项目
关键词
海洋平台
随机动力响应
波浪
结构-桩-土相互作用
疲劳寿命
offshore platform
stochastic dynamic response
wave
structure-pile-soil interaction
fatigue life
