Abstract: With a 34.7 m catamaran fishing boat taken as the study object, according to requirements of relevant regulations of China Classification Society, finite element analysis method is presented for total structural strength of the catamaran fishing boat. The wave loads are calculated with direct calculation method and normative calculation method, thus to determine the input loads for analysis of the total structural strength of the catamaran fishing boat, establish the finite element model of the whole catamaran fishing boat’s structure, exert constraints and loads for analysis of the total strength, study the stress distribution of various parts of the hull, evaluate the key buckling strength of the cross structure, and analyse buckling strength characteristics of each member. The results show that the total structural strength of the catamaran fishing boat meets the requirements, the total transverse moment has the greatest influence on the total strength, the stress concentration appears at the junction between the cross structure’s front and aft end walls and the demihull, and the superstructure has a great impact on the transverse and torsional strength. This provides a reference for the design and construction of other catamaran fishing boats.

Key words: Catamaran fishing boat, wave loads, structural strength

摘要： 以一艘34.7 m双体钓鱼船为研究对象，结合中国船级社相关规范的要求，提出了一套双体钓鱼船结构总强度有限元分析的方法。其中波浪载荷分别采用直接计算法和规范计算法进行计算，以此确定双体钓鱼船结构总强度分析的输入载荷；建立整船结构有限元模型，施加约束和载荷后进行总强度分析，探究双体钓鱼船船体各部位的应力分布；对连接桥结构进行重点屈曲强度评估，分析连接桥各构件的屈曲强度特点。结果显示：双体钓鱼船结构总强度满足要求，总横弯矩对总强度的影响最大，连接桥前后端壁与片体连接处出现应力集中现象，上层建筑对横向和扭转强度有较大影响。本研究结果可为其他双体钓渔船的设计和建造提供参考。

关键词: 双体钓鱼船, 波浪载荷, 结构强度