Improvement of weld details to avoid brittle fracture initiating at the toes of weld access hole of the beam end - prediction of ultimate strength of welded joint with conventional detail
Improvement of weld details to avoid brittle fracture initiating at the toes of weld access hole of the beam end - prediction of ultimate strength of welded joint with conventional detail
复制标题
改进焊缝细节，避免在梁端焊缝孔趾处引发脆性断裂——用常规细节预测焊接接头的极限强度
DOI：
10.1007/s40194-022-01299-0
复制
发表时间：
2022
影响因子：
2.1
通讯作者：
Itatani Toshiomi
中科院分区：
文献类型：
--
作者：
Azuma Koji;Iwashita Tsutomu;Itatani Toshiomi
试验结果表明，部分切割角焊(PCFW)工艺能有效提高焊接接头的塑性转动能力，避免脆性断裂。还验证了威布尔应力方法与韧性标度模型方法在预测上述裂纹脆性断裂方面的适用性。由脆性断裂引起的梁端破坏是钢结构倒塌的主要原因之一。本文旨在将改进的波束镜和PCFW程序应用于工字形截面梁端。PCFW在远离法兰板的方向上偏移焊接接入孔，以避免在焊接接入孔的脚趾处出现应变集中。通过试验和有限元分析，确定了现场焊接接头中合适的焊接孔形状。循环荷载试验采用梁-横隔板节点模型，该模型代表通过横隔板的梁-柱连接。延性裂纹在翼缘和腹板之间进行的埋弧焊的脚趾处开始产生。
The test results demonstrate that the partial cutting fillet weld (PCFW) procedure can effectively enhance the plastic rotation capacity of a weld joint and can avoid brittle fractures. The applicability of the Weibull stress approach when compared to that of the toughness scaling model approach in predicting brittle fractures from the aforementioned cracks is also verified. Beam end failure due to brittle fractures is one of the main reasons for the collapse of steel structures. This paper aims to apply the modified beam cope and the PCFW procedure in an I-section beam end. PCFW offsets the weld access hole in a direction away from the flange plate to avoid strain concentration at the toes of the weld access hole. The suitable shape of the weld access hole used in the field-welded connection is determined through experimental and finite element (FE) analysis. Cyclic loading tests are conducted using beam-to-diaphragm joint models, which represent the beam-to-column connections through the diaphragm. Ductile cracks are initiated at the toes of the submerged arc welding performed between the flange and web plate.