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《Journal of Mechanical Strength》 2001-01
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YAO Guochun HUO Lixing ZHANG Yufeng JING Hongyang YANG Xinqi (College of Materials Science & Engineering, Tianjin University, Tianjin 300072, China)  
The experience from recent earthquakes of USA and Japan shows that brittle fracture of welded steel structure always starts from high stress zone with welded defects. As backing bar for grooved weld on beam flange exists, artificial crack is formed because of lack of fusion at the root of flange weld.In this paper stress distribution of connection is computed with FEM, and stress concentration at the root of flange weld is also analyzed. Stress intensity factors ( K Ⅰ) at the root of flange weld are computed from the viewpoint of fracture mechanics. The computation shows that stress intensity factor on bottom flange weld is obviously higher than that on top flange weld. It is proved by the fact that brittle fracture is inclined to start at the root of bottom flange weld on actual earthquake.
【Fund】: 国家自然科学基金资助项目! (599750 66)
【CateGory Index】: TG405
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