叠合梁屈曲的分析与数值研究  

Analytical and Numerical Studies on the Buckling of Delaminated Composite Beams

作　　者：Chun Wee Yap Gin Boay Chai 

出　　处：《钢结构》2008年第2期80-80,共1页Steel Construction

摘　　要：根据Euler-Bernouli梁与古典叠合梁理论,提出了一个分析模型,用于获得叠合梁的屈曲荷载,同时,用有限元方法验证了该模型。数值模拟采用8节点壳单元和接触对单元。对铺层方向、排列次序、铺层在宽度方向上的位置、铺层长度以及总层数等参数的影响进行了分析。研究表明,应用R2分析模型给出了比R1更精确的结果;同时发现,重要的表达方式必然包含于反对称次级迭合单元的弯曲刚度阵中;此外,叠合层的长度也影响精确性和分析预测之间的差异。但分析结果和模型值吻合很好。In this article, an innovative approach is proposed using the Euler-Bernoulli beam and classical lamination theory （CLT） to create an analytical model that can be used to obtain the buckling load of a delaminated composite beam. Furthermore, the finite element method is used as a tool to validate the analytical model. An 8-noded shell element and a contact pair are used in the numerical simulation. Studies are carried out on ply orientation, stacking sequence, through-the-width location of the delamination, delamination length and effect of total number of plies. It is found that application of R2 to the analytical model will always yield a more accurate answer than use of RI. It is also observed that is an important expression that must be included to＇compute the flexural stiffness of the individual sub-laminates of the anti-symmetric laminated beam considered more accurately. Moreover, it is noted that the length of the delamination will affect the accuracy and difference between the analytical predictions. Nevertheless, the analytical results and simulation values are in good agreement.

关 键 词：叠合单元 分层屈曲 分析方法 有限元分析 

分 类 号：TU323.3[建筑科学—结构工程]