Abstract:As the support member of steel tubular structure, the tubular joint may be damaged under impact and explosion, even causing the collapse of the entire structure. To study the effect of initial stress and ratio of diameter to thickness, two groups of 6 tubular K-joints were tested by drop hammer testing machine. In each group of 3 specimens, the initial force states are that the chord and the brace were not loaded the initial axial force, the chord was loaded the axial tension and the two braces were loaded the axial pressure at the same time, and the chord was loaded the axial tension and two braces were loaded tension and pressure force respectively. Based on the results obtained from the test, the calculating methods on the impact bearing capacity of the relevant codes at home and abroad is compared. The results show that the failure mode of all joints is the dent failure of top surface of chord at the impact zone. When the initial stress state is the same, the local dent deformation and transverse deformation of the larger diameter-thickness ratio increase by 19% and 3% respectively, the peak value of impact force decreases by 8%, and the impact duration increases by 11%; When the diameter-thickness ratio is the same and the chord and brace are not applied the initial axial force, the local dent deformation is the smallest, the impact force is the largest and the impact duration is the shortest; the platform value of the impact force time history curve is suitable to be taken as the impact bearing capacity.
曲慧1,王庆凡1,李伟1,陈琦1,徐洁2. 主管受拉的K形圆管节点抗冲击性能试验研究[J]. 振动与冲击, 2022, 41(6): 123-129.
QU Hui1,WANG Qingfan1,LI Wei1,CHEN Qi1,XU Jie2. Experimental study of a tubular K-joint with preloaded axial tension on its chord under lateral impact loading. JOURNAL OF VIBRATION AND SHOCK, 2022, 41(6): 123-129.
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