一种基于精确刚度分析的刚性连接单元

NASTRAN刚性连接单元RBE3中的权因子需要人为设定,由此导致分配节点载荷具有较强的主观性。针对该问题,基于结构刚度矩阵的缩聚原理提出一种精确的刚性连接单元,该单元可将指定节点上的载荷精确分配至结构的主要承力节点,并能有效克服RBE3单元中权因子不直观且难以确定的缺点。通过算例验证,表明采用本文所提出的精确刚性连接单元可以精确完成由加载节点到主要承力节点的载荷分配计算,且所得载荷分配结果更为精确可靠。

A new rigid connection element based on the accurate stiffness analysis

In this paper, a new rigid connection element is proposed to accurately distribute the load acting at the specified node to the main structure nodes based on the principle of structure stiffness matrix condensation. For the rigid connection element (RBE3) in the NASTRAN, it requires the user to specify the weight factor of each main structure node subjectively. However, these factors are difficult to determine, which make the calculation of the distributed loads inaccurate. The new element effectively overcomes the shortcomings of the RBE3 element and makes the solution of distributed loads to be more accurate and reasonable. This element also facilitates the user"s modeling process. The numerical results show that the new element can accurately derive the load distribution of the main structure nodes.