考虑焊缝单元的钢节点有限元计算方法

Steel Joints FEM Considering Weldingline Element

焊接是不同钢构件连接最常用的方式之一,出于多种原因,传统的计算对焊缝进行了简化或合并处理,这与构件的实际受力状态有较大偏差.为此,提出了钢结构三维焊缝单元的定义及其作用机理,较为精细地模拟了焊缝的应力应变状态、材料属性、应力集中情况.由于在有限元数值分析中,焊缝单元的物理特性在整个结构的作用中有较大影响,将考虑焊缝单元的节点有限元计算结果与传统的节点计算方法、简化的有限元模型的计算结果进行对比,发现了考虑焊缝单元的作用与属性,对结构的受力分析有更重要的意义.

Welding is one of the common methods in connecting different steel members.For many reasons,the traditional calaulations simplify or co mbines to weldinglines,which leads to a big deviation with actual stress states. Therefore,the definition and mechanism of 3D weldingline eleme nt were put forward in the paper,then the stress and strain stat es,material properties and stress concentrations were precisely simulated with FEM.Because physical properties of weldingline elements took a greater effect on the whole structures in the finite element analysis.FEM calculation result considering welding line elements was contrasted with traditional method and simplified finite element model.It was obtained that considering effects and properties of the weldingline elements would have more practical value for the stress analysis of structures.