Development of a unified formula for evaluating the safe working loads of ship block support structures
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초록
To build a vessel, structural divisions (blocks) of various sizes are first used to form small and medium assemblies, and then a large assembly is formed. The building blocks are finally assembled in a dock via pre-erection to complete hulls, during which supports of various shapes are utilized to prevent overturning and control load distribution. These supports are tailored for specific sites; hence, modifying them for use in jigs may result in jig safety misestimation. Several recent cases of structural damage due to block overturning were caused by the load exceeding the allowable load of the aged supports. In this study, to develop a method for accurately predicting the safe working loads (SWLs) of supports, which are essential in shipbuilding, we performed a finite element series analysis while varying the parameters of different supports, to determine the effect of the parameters on the SWL. In addition, we compared the obtained results with the existing criteria. The Euler equation overestimated the effect of the length change and thus provided unreliable results for long supports. However, the proposed empirical formula based on nonlinear analysis accurately pre-dicted the SWL of supports and reflected the influence of the parameters; therefore, the formula is beneficial for support design.
Abstract
To build a vessel, structural divisions (blocks) of various sizes are first used to form small and medium assemblies, and then a large assembly is formed. The building blocks are finally assembled in a dock via pre-erection to complete hulls, during which supports of various shapes are utilized to prevent overturning and control load distribution. These supports are tailored for specific sites; hence, modifying them for use in jigs may result in jig safety misestimation. Several recent cases of structural damage due to block overturning were caused by the load exceeding the allowable load of the aged supports. In this study, to develop a method for accurately predicting the safe working loads (SWLs) of supports, which are essential in shipbuilding, we performed a finite element series analysis while varying the parameters of different supports, to determine the effect of the parameters on the SWL. In addition, we compared the obtained results with the existing criteria. The Euler equation overestimated the effect of the length change and thus provided unreliable results for long supports. However, the proposed empirical formula based on nonlinear analysis accurately pre-dicted the SWL of supports and reflected the influence of the parameters; therefore, the formula is beneficial for support design.
참고문헌 (11)
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