Low Cycle Fatigue Research on Welded Joint of Beam-Column Conection

焊接接头的低周期寿命强度钢束柱连接，其中风和/或地震负荷是受启发的实验所述重复的压力。测试样品是一个T型连接范围的周柱和光束。该柱是矩形空心部分（ □ -200x200x9，STKR 400），光束是H部分（H-200x100x5.5x8，SS 400）。测试参数为1）缩放和/或非缩放， 2）反向杆和/或非反向杆。经测试的标本总共有24件由这些参数组合而成。低周期寿命测试的结果，光束到柱子是如下所示，1。非尺度特征是由于裂缝传播的光束凸缘的完全宽失败，（1）在非背棒的情况下，在口腔和光束凸缘之间的沟槽之间的沟槽， （2）在背棒之间的沟槽和在位移幅度以下的情况下，光束凸缘之间的沟槽和光束凸缘在1.25下，D2 p，D2 p，D2，（3） the groove weld between the diaphragm and the beam flange when over 1. 0的イイD2pイエD2 in case of with backing bar. 2。The fracture of with scallop specimens were also the beam flange by the crack propagation from （4） the groove wd between the diaphragm and the beam flange when the displacement-amplitude was under 0.87△ i D2pie D2， （5） the bottom of the scalop when over 1.0 △ i D2pie D2 in non-backing bar的情况下，和（6）背景杆和背景杆之间的填充物焊接在箱子中。带有鳞片的标本的脂肪寿命可确定为约20%至50%，在非背棒的情况下可确定为约10%至30%，在带有背棒的情况下可确定为约10%至30%。

The low-cycle fatigue strength of welded joints steel beam-column connection which were subjected repeated stresses by wind and/or earthquake loads were investigated experimentaly. Test specimens was T type connection consiste of the perimeter column and beam. The column was a rectangular hollow section ( □ -200x200x9, STKR400), and the beam was H-section (H-200x100x5.5x8, SS400). Test parameters were 1) scallop and/or non-scallop, 2) backing bar and/or non-backing bar. Tested specimens were total 24 pieces by combination of these parameters.The results of low-cycle fatigue test of welded joints of beam to column were as follows,1. The facture of non-scallop specimens were the full wide failure of the beam flange by the crack propagation from (1) the groove weld between the diaphragm and the beam flange in case of non-backing bar, (2) the fillete welds between backing bar and the beam flange when the displacement-amplitude was under 1.25 △ィイD2pィエD2, (3) the groove weld between the diaphragm and the beam flange when over 1.0 △ィイD2pィエD2 in case of with backing bar.2. The fracture of with scallop specimens were also the full wide failure of the beam flange by the crack propagation from (4) the groove weld between the diaphragm and the beam flange when the displacement-amplitude was under 0.87△ィイD2pィエD2, (5) the bottom of the scallop when over 1.0 △ィイD2pィエD2 in case of non-backing bar, and (6) the fillet welds between the backing bar and the beam flange in case of with backing bar.3. The fatigue life of with scallop specimens deteriorated to about 20% to 50% of the fatigue life of the non-scallop specimens in case of non-backing bar, and deteriorated to about 10% to 30% of these in case of with backing bar.