某散货船底凳与内底相交处热点疲劳分析及改进方案

Comparative Analysis of Some Fatigue Improving Plan at Intersection of Lower Stool and Inner Bottom

目前对屈服强度和屈服强度的评估相对较成熟,理论性也较强,结构直接计算方法已经成为评估和校核不可或缺的手段;而疲劳强度的计算在现行规范中现在仍是以经验公式为主。由于对疲劳性能影响的因素很多,在实船的设计计算中难免会出现疲劳强度达不到规范要求的情况,因此考虑使用中国船级社在MSC PATRAN平台的基础上按照IACS CSR-JBP规范开发的软件DSA-JBP,对底凳与内底相交处的疲劳累积损伤进行评估,并据评估结果对超出规范要求的热点区域提出改进方案。

More research had been paid for yield and buckling strength which are supported by mature theoretical methods,and the structure direct analysis method has become indispensable for assessment.But fatigue strength calculation mostly depends on empirical formula in current ship rules.More factors have relations to fatigue strength and the fatigue strength often can＇t comply with ship rule make the fatigue strength improving as an important term.In this paper,the CCS DSA-JBP developed according to IACS CSR-JBP was employed to analyze and compare some improve methods of cumulative fatigue damage for the intersection of lower stool and inner bottom which is not comply with CSR rule.