[提要]介绍了开槽垫板施工工艺的特点，并利用有限元法和断裂力学原理对应用开槽垫板的高层钢框架节点的脆断性能进行了分析。和我国目前采用的施工工艺的比较结果表明，应用开槽垫板的节点发生脆性断裂的可能性要小得多，是。种值得推荐的施工方法。

[关键词]钢框架 梁柱节点 开槽垫板

The paper introduces characteristics of grooved backup bar and analyses the performance of brittle fracture of steel frame connections using grooved backup bars. The results of analysis indicate that fracture possibility using the technique of grooved backup bars is smaller than the technique we use in china. It is significant to introduce the technique of grooved backup bars to construction of beam-column connections.

Keywords: steel frame; beam-column connections; grooved backup bar