大型火电厂全焊钢框架梁柱连接抗震性能及加腋修复试验研究

进行了4个1/2比例常规全焊钢框架梁柱连接的循环加载试验,研究了梁翼缘宽厚比、节点域柱腹板高厚比对连接破坏形态、延性和极限承载能力的影响,分析了这些因素对连接的滞回性能及对节点域柱腹板剪切变形的影响规律。对其中的两个试件破坏的焊缝修复后加腋重新进行试验,以研究加腋修复的效果。试验结果表明,加腋改进形式可以大幅度提高连接的延性和极限承载力,其破坏形式均为梁端形成塑性铰后经历反复塑性变形而发生整体失稳,保证了强震条件下“强节点弱构件”的设计原则。给出了设计施工建议。

Experimental Research on Hysteretic Behaviors of Welded Moment Resisting Frame Connections with General and Haunch Stiffened Form in Power Plant

In order to obtain the influences of width-to-thickness ratio of beam flange and height-to-thickness of column web in panel zone on failure mode,ductility and bearing capacity of beam-column connections,four half-scale specimens were tested under cyclic loading.Two of these specimens were repaired and stiffened with haunch to evaluate the effect of this repair method.The results reveal that it might greatly improve the ductility and bearing capacity of connections.All the repaired specimens failed with the formation of plastic hinge at the end of beam near the haunch,and lost their global stability due to cyclic plasticity deformation,which ensured the design criterion of strong-connection-weak-member.Suggestions on design and construction are presented.