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对单调加载下螺栓连接圆形或方形钢管混凝土柱的外伸端板性能进行了试验研究。为了提高连接处的强度和刚度,将连接件与钢管混凝土连接的螺栓进行锚固张拉。研究端板厚度和柱横截面类型对试验所用连接件的静态行为与失效模式的影响。从弯矩-转角关系、连接件刚性、变形形式和应变响应方面对螺栓外伸端板连接件的结构特性进行评估。试验结果显示:螺栓连接钢管混凝土柱的外伸端板具有很高的强度和刚度,连接件的转动能力能满足抗震区关于抗震性的延性要求。试验研究也论证了可以通过对螺栓进行锚固张拉提高连接件的强度和刚度,并利用适当厚度的端板使外伸端板连接件的节点接近等强。
The behavior of overhanging end-plates of circular or square CFST columns bolted to monotonic loading was investigated. In order to improve the strength and rigidity of the joints, the bolts connecting the concrete to the concrete-filled steel tube are anchored and tensioned. The effects of end plate thickness and column cross-section type on the static behavior and failure modes of the connectors used in the test were studied. The structural characteristics of the bolt extension end plate connectors were evaluated in terms of moment-angle relationship, connector stiffness, deformation and strain response. The test results show that the outrigger end of bolted concrete-filled steel tubular column has high strength and stiffness, and the rotation ability of the connector can meet the requirement of ductility of earthquake resistant area. Experimental studies have also demonstrated that the strength and stiffness of the connector can be increased by anchoring the bolt, and the ends of the outrigger connector can be made nearly equal with the proper thickness of the terminal plate.