焊接钢结构梁柱节点地震下的断裂行为研究

INVESTIGATION ON FRACTURE BEHAVIOR OF WELDED STEEL STRUCTURE BEAM-COLUMN CONNECTIONS UNDER EARTHQUAKES

在近年来美国和日本等国相继发生的地震中，许多建筑物的破坏是由于焊接梁柱节点的脆性破坏引 起的，而节点的破坏除了结构方面的原因以外，绝大多数是与焊接方面的因素紧密相关的。结合实际破坏事 例，分析脆性断裂的原因，表明焊接钢结构梁柱节点的失效破坏往往起源于应力集中的区域，并提出相应的预 防措施．

In the recent earthquakes which occurred in USA and Japan, damages to many buildings resulted from the brittle fracture of beam-column connections. Brittle fracture is mainly due to variables of welding, and it is also affected by some factors of structure. In this paper the affecting factors of brittle fracture are analyzed with the actual examples of fracture. The study shows that brittle fracture of welded steel structure beam-column connections started at the stress concentrated zone. Finally, the ways of preventing brittle fracture are discussed.