强震下钢框架梁柱焊接连接的断裂行为

Fracture Behavior of Welded Beam to column Connections of Steel Moment Frames under Severe Earthquakes

本文介绍了１９９４年美国Ｎｏｒｔｈｒｉｄｇｅ地震和１９９５年日本阪神地震中的钢框架梁柱焊接连接的断裂模式。结合Ｈ形梁Ｈ形柱节点低周反复荷载试验的断裂现象，指出梁柱焊接连接脆性断裂对节点承载力影响极大，而脆性断裂的原因主要有焊接缺陷、构造不合理及设计方案欠妥等。最后，以降低梁柱焊接连接缺陷敏感度为目标探讨了脆性断裂的预防。

In this paper, fracture modes of welded beam to column connections of steel moment frames damaged in the 1994 USA Northridge Earthquake and the 1995 Japan Hyogoken Nanbu Earthquake are introduced. Based upon the fracture behaviors of H beam to H column joints under low cyclic loading tests, it is pointed out that, the brittle fracture of welded beam to column connections significantly affected the bearing capacity of the joint; brittle fracture is mainly due to welding defects, problems shaded in connection details and structural design, and so on. Finally, the ways of improving the ductility of the beam to column joints and avoiding the defect sensitivity of the welded connections are discussed.