摘要
结合中国船级社发布的《固定式海洋钢制结构冰激振动与冰激疲劳分析指南》,以渤海某平台为例,分析了不同海冰速度、海冰厚度对平台振动响应和疲劳损伤的影响,并给出了冰激疲劳的计算方法。分析发现:第一,在慢冰速下(0.1 m/s以下),海冰-结构会发生稳态振动,且由于该速度范围为目前渤海海域较高概率冰速,在该冰速下结构的损伤较为显著;第二,随着冰厚的增加(17.5 cm),高冰速(0.4 m/s以上)对结构损伤的作用也会加剧,但由于其所占概率的比例较低,对结构累计损伤的作用效果并不明显;第三,根据平台的自振频率,存在一个临界冰厚(12.5 cm),在该范围内,海冰-结构的作用主要受冰速影响。
Combined with the"Guide for analysis of ice induced vibration and ice induced fatigue of fixed offshore steel structures"issued by China Classification Society,and taking an actual platform in Bohai Sea as an example,this paper analyzes the influence of ice speed and ice thickness on the vibration response and fatigue of the platform.The results show that:First,the steady-state vibration of ice-structure occurs at slow ice velocity(below 0.1 m/s),and the damage is significant due to high probability of such ice velocity in Bohai Sea;Second,with the increase of ice thickness(to 17.5 cm),the effect of high ice velocity(above 0.4 m/s)on structural damage is aggravated,but due to its low proportion of probability,the effect on structural cumulative damage is not obvious;Third,according to the natural vibration frequency of the platform,there is a critical ice thickness(12.5 cm),and within this ice thickness range,the ice-structure response is mainly affected by ice velocity.
作者
徐辉
柴俊凯
XU Hui;CHAI Junkai(CCS Offshore Technology Center,Tianjin 300457,China)
出处
《石油工程建设》
2020年第S01期1-7,共7页
Petroleum Engineering Construction
关键词
海冰速度
海冰厚度
平台振动响应
结构疲劳损伤
平台自振频率
sea ice velocity
sea ice thickness
vibration response of platform
structural fatigue damage
natural vibration frequency of platform
