摘要
针对钢框架梁端翼缘扩大型节点进行4个1∶2缩尺比例的模型试验,深入研究梁端翼缘侧板加强型节点和梁端翼缘圆弧扩翼型节点在低周往复荷载作用下节点的屈服荷载、极限荷载、滞回曲线、骨架曲线、延性和耗能能力等抗震性能。为了比较分析,还设计制作了1个普通栓焊节点试件。试验结果表明,4个梁端翼缘扩大型梁柱节点均达到了抗弯钢框架连接的抗震要求,而普通栓焊节点试件由于梁柱焊缝根部的脆性破坏制约了梁柱节点的塑性发展;梁端翼缘侧板加强型节点由于侧板与梁翼缘对接焊缝的影响使得焊接热影响区母材变脆而发生脆性撕裂,致使节点的耗能性能受到影响;梁端翼缘圆弧扩翼型节点的抗震性能优于梁端翼缘侧板加强型节点。建议在实际工程中,采用圆弧渐进式过渡的梁端翼缘扩翼型节点,可以有效保证梁柱节点连接的塑性变形和耗能能力。
This paper presents an experimental study on four one-half scale beam-to-column connection models with the horizontal haunch.Test results included the yielding capaicty,ultimate load,hysteretic curves,skeleton curves,ductility and energy dissipation capacity of connections with side plate section and widen flange section under low cyclic loading.A conventional specimen was also designed for comparison.The results demonstrate that all the beam-to-column connections with beam-end horizontal haunch fully satisfy the demand of special moment resistant frames,but the brittle failure of the joint weld restricted the plastic property of the conventional connection.The side-plate reinforced connections have a worse ductility due to the heat effect of welding to connect the side plates and the beam flanges,which caused brittle tear of beam flanges in the heat affected zone outside of reinforced part.The seismic performance of connections with widen flange section is better than the side plate section,thus,are suggested for satifsfying the demand of plastic deformation and energy dissipation capacity in practical project.
出处
《建筑结构学报》
EI
CAS
CSCD
北大核心
2010年第4期94-101,共8页
Journal of Building Structures
基金
国家自然科学基金项目(50778092)
关键词
钢框架
梁端翼缘扩大型节点
低周反复荷载试验
抗震性能
steel frame
connections with beam-end horizontal haunch
low cyclic load test
aseismic behavior
