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Seismic fracture evaluation of diaphragm joints in welded beam-to-box column moment connections

机译：焊接梁箱柱矩形连接中隔膜关节的地震骨折评价

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摘要

Steel box columns are widely used in steel building structures in Taiwan due to their dual strong axes. To transfer the beam-end moment to the column, diaphragm plates of the same thickness and elevations as the beam flanges are usually welded inside the box column. The electro-slag welding (ESW) process is widely used to connect the diaphragms to the column flanges in Taiwan because of its convenience and efficiency. However, ESW may increase the hardness of the welds and heat-affected zones (HAZs), while reducing the Charpy-V notch strength in the HAZ. This situation can cause premature fracture of the diaphragm-to-column flange welds before a large plastic rotation is developed in the beam-to-box column joints. To quantify the critical eccentricity and the effectiveness of fracture prediction, this study uses fracture prediction models and finite element model (FEM) analysis to correlate the test results. In this study, two beam-to-box column connection subassembly tests are conducted with different loading protocols and ESW chamber shapes. To implement a fracture prediction model, the material parameters are established from circumferential notched tensile tests and FEM analysis. Test results indicate that the fracture instances can be predicted on the basis of the cumulative plastic deformation in the HAZs. Analytical results indicate that fracture instances and locations are sensitive to the relative locations of the ESW joints and beam flange. Tests also confirm that the possible fracture of the diaphragm-to-column flange joints can be mitigated by enlarging the chamber of the ESW joint.
机译：由于双强轴，钢箱柱广泛用于台湾的钢制建筑结构。为了将光束端点转移到柱中，通常在横梁柱内焊接相同厚度和升高的隔膜板，并且通常焊接在箱柱内。电渣焊（ESW）过程广泛用于将隔膜连接到台湾的柱法兰，因为其便利性和效率。然而，ESW可能会增加焊缝和热影响区域（HAZS）的硬度，同时降低HAZ中的夏比V Notch强度。在光束到箱柱接头中开发出大型塑料旋转之前，这种情况可能导致膜片到柱法兰焊接过早的骨折。为了量化临界偏心和裂缝预测的有效性，本研究使用裂缝预测模型和有限元模型（FEM）分析来关联测试结果。在该研究中，使用不同的装载协议和ESW室形状进行两个横频盒列连接子组件测试。为了实现裂缝预测模型，材料参数是从周向性的拉伸试验和有限元分析建立的。测试结果表明，裂缝实例可以基于危险中的累积塑性变形来预测。分析结果表明，断裂实例和位置对ESW关节和梁法兰的相对位置敏感。测试还证实，可以通过扩大ESW关节的腔室来减轻隔膜到柱法兰接头的可能骨折。

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