Abstract Considering the significant brittle fractures of the beam-to-column welded joints in past earthquakes, it is essential to study the plastic deformation capacity of these welded joints under random loads. But the plastic deformation capacity is of much uncertainty in the past experimental data due to weld. The purpose of this paper is to establish some artificial notched specimens without weld instead of welded specimens to avoid the weld caused uncertainty. Seven typical slice specimens are extracted from investigations of welded joints of steel beam-to-column connections with geometrical and metallurgical notches. The stress-strain states of the notch models were studied by FEM analysis. Then notched specimens made of base metal, which are called equivalent models, are designed for representing the stress-strain states of the actual connections. Thus the artificial notched specimens can be used to test and analyze the plastic deformation capacity instead of the actual welded joints with highly random mechanical properties.

中文翻译：

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具有几何和冶金缺口的焊接梁柱连接的应力应变状态

摘要 考虑到以往地震中梁柱焊接接头发生明显的脆性断裂，研究这些焊接接头在随机载荷作用下的塑性变形能力具有重要意义。但以往的实验数据中，由于焊缝的影响，塑性变形能力有很大的不确定性。本文的目的是建立一些没有焊缝的人工缺口试样代替焊接试样，以避免焊缝造成的不确定性。从具有几何和冶金缺口的钢梁柱连接的焊接接头的研究中提取了七个典型的切片试样。通过有限元分析研究了缺口模型的应力应变状态。然后是由贱金属制成的缺口试样，称为等效模型，设计用于表示实际连接的应力应变状态。因此，人工缺口试样可以代替具有高度随机力学性能的实际焊接接头进行塑性变形能力的测试和分析。