极端风暴潮下近海导管架平台结构安全分析

Safety Analysis of Offshore Jacket Platform Structure under Extreme Storm Surges

基于导管架平台极端环境作用下极限状态的分析,研究了近海导管架平台的结构安全。由极端风暴潮载荷的模拟方法,确定适用于近海导管架平台的安全评价方法。并以某近海导管架平台为例,进行甲板上浪载荷计算、静力非线性分析、动力响应分析及极限承载能力分析。结果表明:极端风暴潮作用下的上浪载荷会减弱近海导管架结构的极限承载能力,也会影响其抗力,须予以重视。

Based on the ultimate limit states analysis against extreme environmental loading of jacket platform,the safety analysis of offshore jacket platform structure was carried out to study the simulation method of extreme storm surges and determine the safety assessment method which suitable for offshore jacket platform.Using an offshore jacket platform as an example,calculation of wave-in deck（WID）load,the static nonlinear analysis,the dynamic response analysis and the ultimate bearing capacity analysis was carried out respectively.The results showed that the WID loads under extreme storm surges decreased the ultimate bearing capacity of offshore jacket platform and influenced the resistance.When the safety analysis of structure is applied to jacket platform in service,great importance must be attaches to the WID loads in the case of extreme storm surges or sinking platform obviously.