自升式碎石铺设整平船主船体有限元分析

Finite Element Analysis of Main Hull Structure of the Self-Elevating Ship for Rubble Laying and Leveling

介绍自升式碎石铺设整平船在站立状态下船体结构分析的规范依据,包括规范要求的设计工况、设计载荷和强度评估标准。详细介绍全船有限元建模过程,包括模型范围、模型边界条件、模型中的计算载荷和计算工况。通过有限元分析,校核船体结构的屈服强度和屈曲强度是否满足规范要求,找出结构中相对"危险"的区域,优化结构设计。同时,利用全船有限元分析结果,还可提取船体垂向变形量和桩腿底部最大支反力,为判断整平系统精度和预压载水量是否满足要求提供设计依据。

The rule standard including design load cases,design load and evaluation criteria of strength required by rules for analyzing main hull structure in elevated condition of the self-elevating ship for rubble laying and leveling were introduced. The process of building the global finite element model including model range,model boundary condition,calculated load and load cases in model were presented in detail. By analyzing the results of finite element analysis,designer could not only evaluate the yielding strength and buckling strength of hull structure,but also find the relatively “dangerous” area in the structure and realize the purpose of optimizing the structure design. Meanwhile using the global finite element analysis results,the vertical deformation of hull structure and the maximum reaction force of bottom of legs could also be extracted,which might provide design consideration for judging whether the precision of leveling system and quantity of pre-ballast water meet the requirements.