Abstract: With an offshore beam trawler taken as the research object, according to Code for Classification of Steel Sea Vessels of CCS, the finite element models of supporting structure of anchor mooring of bow and midship were established by MSC.PATRAN, the strength of supporting structure of anchor mooring was calculated directly according to the actual anchor mooring and operation conditions of fishing vessels. For midship model, the influence of different mooring angles on the strength of hull supporting structure and the structural strength under fishing load were analyzed. The mooring load was loaded into the bow model at the most dangerous angle for strength checking, and the stress and deformation of the model under different working conditions were analyzed. Result shows that: the strength of supporting structure of anchor mooring meets the requirements of specifications under various working conditions, the maximum normal stress was found under mooring condition and the minimum was found under fishing auxiliary condition. The structural stress reached its maximum when the angle between the mooring rope and the mid-longitudinal section was 90 degrees and the angle between the mooring rope and the horizontal plane was 0 degree, and this situation should be avoided as far as possible to improve the service life of bollard and its supporting structure. This paper could be used as a reference for the design of beam trawler and its mooring operation.

Key words: Beam trawler, angle of mooring, finite element, strength

摘要： 以某一近海桁拖渔船为研究对象，参照中国船级社（CCS）《钢质海船入级规范》，利用MSC.PATRAN软件分别建立船型船艏和船舯锚系泊支撑结构的有限元模型，根据渔船实际锚系泊和作业情况对其锚系泊支撑结构进行强度直接计算。针对船舯模型，分析不同系泊角度对船体支撑结构强度的影响以及渔捞载荷下的结构强度，并将系泊载荷以最危险的角度加载至船艏模型进行强度校核，分析各工况下模型应力和变形情况。计算结果表明：各工况下船型锚系泊支撑结构强度均满足规范要求，且以锚泊工况的模型正应力最大，以渔捞辅助工况模型的正应力最小。当系泊绳索与中纵剖面夹角为90°、与水平面夹角为0°时，其结构应力达到最大，在实际作业中应尽量避免这种情况，以提高带缆桩及其支撑结构的使用寿命。本研究成果对桁拖渔船的设计和实际系泊操作具有一定的参考作用。

关键词: 桁拖渔船, 系泊角度, 有限元, 强度