桁架节点不同有限元分析建模方法的探讨

Discussion on Different Finite Element Modeling Methods for Truss Nodes

摘要:

钢桁梁节点进行有限元数值模拟分析时,采用多尺度模型方式或者节点模型方式进行分析较为常见,以多尺度模型计算结果为参考,采用位移边界和内力边界综合施加方式建立的节点模型的结果与其相差较小,两种方式的模型均可以用于节点分析。结合某一顶推施工的 钢桁梁最大悬臂施工状态时的节点,利用有限元软件MIDAS Civil和MIDAS FEA NX,采用不同的单元类型(梁单元或实体单元)对节点进行分析对比,确定节点模型用于实际工程的节点分析更具有优势。此结论可为相似工程的节点分析提供参考。

Abstract:

When the finite element numerical simulation analysis of steel truss beam nodes is carried out, it is common to use the multi-scale model method or node model method for analysis. Taking the calculation results of the multi-scale model as the reference, the results of the node model established by the comprehensive application of displacement boundary and internal force boundary are not so different, and the models of both methods can be used for node analysis. Combined with the node in the construction state of the maximum cantilever of steel truss beam by the jacking method, the finite element software MIDAS Civil and MIDAS FEA NX are used to analyze and compare the nodes by the different element types (beam element or solid element). It is more advantageous to determine the node model for the node analysis of actual engineering. This conclusion can provide a reference for node analysis of similar projects.