【摘要】 本文用改进的第二类可靠性分析方法讨论了船首底板受砰击载荷时的强度问题。为了标定板的极限强度计算公式,用有限元法对矩形板的大挠度弹塑性强度作了系列计算,并与刚塑性极限分析作了比较,表明实际的船底板可以承受比刚塑性上限解还要大的荷重。文中还以10条各种类型的实船进行了计算,与常规方法的结果作了比较,证实可靠性分析方法更为合理。更多还原

【Abstract】 Using an advanced level II reliability analysis technique, the reliability analysis for ship bottom plates unter slamming impact pressure is presented. A modified formula for the estimation of the resistance of rectangular plates to a uniformly transverse load is derived, calculating the elastoplastic rectangular plates with finite deflections parametrically and comparing the numerical results with the upper bound on the limit load. It is seen that the ship bottom piate can carry more load than upper bound on the limit load.Bottom plates under slamming impact pressures of ten vessels of different types were analysed. Comparing the results with the ones given by the conventional method reveals that there is a more rational method to analyse the resistance of bottom plates with the help of structural reliability analysis.更多还原