电热熔渣焊接瑕疵于钢骨箱型柱板破裂的有限元素分析

Finite Element Analysis of Electro-Slag Weld Defects on Fracture of Steel Box Column Plate

为探讨焊接瑕疵对于钢骨箱型柱板破裂行为的影响,本文采有限元素分析,根据裂缝尖端开口位移、应力三轴度与破裂指数等行为指标,来评估柱板破裂的可能性。有限元素模型参数分析结果显示,侧垫板间隙与钢梁相对于电热熔渣焊道的偏心等参数对于箱型柱板破裂的影响较小;然而由于电热熔渣焊道的偏心,即使侧垫板与柱板间隙处的电热熔渣焊熔接线至内横隔板的一个较小的距离,也将产生较大的裂缝尖端开口位移、应力三轴度与破裂指数,因而可能造成柱板的破裂。

To investigate the effect of electro-slag weld defects on fracture of steel box column plate, finite element analysis was conducted to assess the possibility of fracture of column plate through performance indices, such as crack tip opening displacement （CTOD）, stress triaxiality, and rupture index. The analysis results of the finite element parametric study show that the variables of the backing plate slit and the deviation of the beam flange with respect to the diaphragm have little effect on fracture of box column plate. However, at the slit of backing plate and column plate, a smaller distance from fusion line to the diaphragm due to the eccentricity of the fusion results in a larger CTOD, stress triaxiality, and rupture index which could be detrimental to the column plate and cause the fracture.