含初始挠度加筋板的极限承载能力分析

摘要

舰船长期服役,甲板结构易产生初始挠度变形,这会对甲板承载能力带来不利影响.加筋板作为船体甲板结构的主要构成单元,研究初始挠度变形对其极限承载力的影响具有重要意义.为了确定初始挠度变形对加筋板极限承载力的影响作用,根据实际情况假设初始挠度为双三角级数形式,利用Ansys计算分析了整体初始挠度的幅值与半波数对极限载荷的影响和典型位置的应力特性,并得到初始挠度对加筋板极限载荷的影响因子计算方法.计算结果分析表明,随着初始挠度的幅值和半波数的增加,加筋板极限承载力逐渐减小;对于含有某种初始挠度的加筋板,其影响因子主要受加筋板的长宽比、厚度和加强筋间距等因素的影响.%The initial deflection existed on the deck of the surface warship at long service and it brought bad effects on the bearing capacity.Study on the effect of initial deflection on the stiffened plate was meaningful since it was the main unit of the deck.For the research,the mode of the initial deflection was regarded as the double trigonometric series based on the practical truth and the effect of the amplitude and the number of half-waves on the critical stress entirely was analyzed by computing with Ansys.The stress state of the typical location was also discussed.The impact factor of the initial deflection was obtained.Results indicate that with the increasing of amplitude and the number of half-waves,the critical stress decreases.For the stiffened plate with one kind of initial deflection,the impact factor is up to the length-width ratio,the thickness of the stiffened plate and the space between stiffeners.