Abstract:In order to analyze hull structure stress variation of beam trawler from hauling outboard to fish unloading onboard, the precautions for designing and installing the mainmast of beam trawler are pointed out. Based on the Rules for Lifting Appliances of Ships and Offshore Installations (2007) and Code for Construction of Domestic Steel Marine Fishing Vessels (2019), the finite element models of main suspender and mainmast support structure of 38 m steel beam trawler are set up by MSC.Patran. With mass loading, load such as wind load and trim and healing of ship considered, the structure strength of main suspender is analyzed in typical working conditions. The constrained force of connection point between main suspender and mainmast are extracted and loaded on the corresponding model,the structure strength of mainmast support structure is analyzed. The result shows that the structure strength of main suspender and mainmast under various working conditions meets the specification requirements, and the stress of the main suspender when a single wire rope is stressed is obviously greater than that when two wire ropes are stressed.