腹板双角钢梁柱连接循环荷载试验研究

为了研究腹板双角钢梁柱连接的抗震性能,对四个连接试件进行了梁端循环位移加载试验。试验中考察了角钢高度、角钢与柱翼缘连接高强螺栓的直径和排列布置对连接的承载能力、滞回性能和破坏机理的影响,分析了这种连接的破坏模式和变形能力。试验结果表明:连接在循环荷载作用下表现出良好的延性,转角均超过0.04rad,连接的最终破坏均为角钢的塑性撕裂破坏;连接具有相当的抗弯能力,在结构分析中,须考虑节点抗弯强度对框架性能的影响,不能简单作为铰接处理;增大角钢的高度,能提高连接的强度;增大螺栓间距,减小螺栓直径,能提高连接的延性。最后,根据试验结果提出设计施工建议。

Cyclic behavior of double angle beam-to-column connections

An investigation was conducted to analyze the seismic behavior of steel double web angle framing connections under severe cyclic loading of earthquakes. The studies consisted of four connection assemblages subjected to increasing level of large cyclic displacements at beam end until failure occurred. The connections angles were bolted to the column flange and welded to the beam web. The effects of the length of angles, the diameter and gauge of bolts on bearing capacity, hysteretic behavior and failure mechanism of connections were studied with failure modes and deformation capacity of connections analyzed. The results indicated that specimens exhibit good ductile behavior, as all the connection rotation exceed 0.04 radians and the final fracture of connections are all plastic split failures of angles; since the connection possesses certain moment resistant capacity, it cannot be treated merely as a hinged joint and the effect of the moment resistant strength on behavior of frames has to be considered in structural analysis;the strengeh of connection can be enhanced by increasing the length of angles; and the ductility of connection can be improved by increasing the bolt distance or decreasing the bolt diameter. Finally, some suggestions about design and construction of such connections are presented.