套筒加强式圆形钢管混凝土柱-钢梁节点抗震性能试验  

Seismic Behavior Testing of Joints Reinforced by Sleeves Between Circular CFST Columns and Steel Beams

作　　者：卜永红[1] 赵均海[1] 张冬芳[1] 樊军超 兰官奇 BU Yong-hong;ZHAO Jun-hai;ZHANG Dong-fang;FAN Jun-chao;LAN Guan-qi(School of Civil Engineering,Chang'an University,Xi'an 710061,Shaanxi,China;Department of Civil Engineering,Xi'an Shiyou University,Xi'an 710065,Shaanxi,China)

机构地区：[1]长安大学建筑工程学院,陕西西安710061 [2]西安石油大学土木工程系,陕西西安710065

出　　处：《中国公路学报》2021年第5期110-122,共13页China Journal of Highway and Transport

基　　金：国家自然科学基金项目(51878056,51508028)。

摘　　要：为解决圆形钢管混凝土柱-钢梁单边螺栓节点在地震荷载作用下存在的安全隐患,提出套筒加强式节点。以节点构造方式和梁柱刚度比为主要影响因素,设计10个1/2缩尺比例的圆形钢管混凝土柱-钢梁节点试件,采用柱端加载方式完成了试件的低周反复荷载拟静力试验,观测了试件的破坏过程与破坏模式,分析了各试件的滞回曲线、承载能力、延性和耗能能力、强度与刚度退化等特征参数,系统研究了不同影响因素下套筒加强式焊接节点、栓焊混合节点与传统螺栓连接节点的破损规律差异,并给出了此类节点极限弯矩的计算方法。研究结果表明:节点的破坏模式主要取决于节点的构造方式和梁柱刚度比,套筒加强式栓焊混合节点避免了螺栓松弛、断裂以及焊缝开裂等破坏形式的发生,达到了"强节点,弱构件"的抗震设计要求;套筒结构使节点核心区的焊缝和螺栓共同承受弯矩和剪力,提高了节点强度和梁柱连接的刚度,节点由螺栓连接时的半刚性连接变为刚性连接;与传统螺栓连接节点相比,套筒加强式节点具有更高的承载力和安全储备,其等效黏滞阻尼系数、转角延性系数、弹性及弹塑性层间位移角均满足规范要求,各抗震性能指标良好;节点极限弯距的计算结果与试验结果吻合较好,表明该方法可用于此类节点的设计计算。To solve the hidden danger of joints using single-direction bolts under seismic loads, this paper proposed joints reinforced by sleeves between circular concrete-filled steel tubular(CFST) columns and steel beams. Considering the joint construction and beam-to-column stiffness ratio as the main parameters, ten half-scale joint specimens were designed. The quasi-static test of the specimens under low cyclic reversed loading was completed by employing column end loading. The failure process and failure mode of the specimens were observed, and the hysteretic curve, bearing capacity, ductility and energy dissipation capacity, as well as strength and stiffness degradation of the specimens were analyzed. The damage law differences of the weld and bolt-weld joints reinforced by sleeves and the traditional joints using bolts were systematically compared using different influence factors, and the calculation methods of the ultimate bending moment of the joints were also provided. The test results demonstrate that the failure modes of joints are decided by the joint construction and the stiffness ratio of beams to columns. The bolt-weld joints reinforced by sleeves can prevent the occurrence of bolt relaxation, bolt fracture, and weld cracking and can meet the seismic design requirements of "strong joint, weak member". The connection stiffness and the strength of joints reinforced by sleeves are enhanced, and the joints change from having a semi-rigid connection to a rigid connection, because the moment and shear force are undertaken by both welds and bolts. Compared with the traditional joints using bolts, the joints reinforced by sleeves exhibit higher bearing capacity and safety reserve. Their equivalent viscous damping coefficient, angle ductility coefficient, elastic and elastic-plastic interlayer displacement angle all meet the requirements of the code, and their seismic performance indexes are satisfactory. Moreover, the calculation results of the ultimate bending moment of the joints are in good agreement with the

关 键 词：桥梁工程 钢管混凝土 试验研究 套筒加强式节点 抗震性能 

分 类 号：U443.2[建筑科学—桥梁与隧道工程]