薄壁杆系考虑节点柔度特征的计算模型及其应用

Caculation model which consided the node’s rigid character of thin walled bars and application

在有限元梁理论中节点完全刚性的假设和实际薄壁杆系节点局部变形的出现产生矛盾,不得不考虑薄壁杆系节 点刚度特征对结构分析结果的影响。该问题引起国内外研究者的重视。针对上述问题,提出一个能够考虑薄壁杆系节 点刚度特征的计算模型。该模型的优点在于它包括了用壳单元离散的节点超单元和梁单元共同构成薄壁杆系计算模 型。在一次计算中能提供节点设计所需要的节点细部应力分布特征,同时也提供梁截面设计所需要的截面内力。

The deformation in joint area of thin walled bars is conflict with the hypothesis that node is rigid in FEA theory.So the influence of node’s rigid character of thin walled bars be considered in the analysis result.A new model is presented,which used both shell element and beam element to discretize joint area.By it,detail information of stress distributing at node area and internal force of element which need for beam’s cross-section design can get by only one time analytical calculation.