装配式Z形钢结构梁柱连接节点力学性能研究

Research on Mechanical Properties of Prefabricated Z-Shaped Steel Beam-to-Column Connections

对装配式Z形钢结构梁柱连接节点进行了单调和往复循环加载试验及有限元分析,以研究其力学性能。对不同连接强度设计下的Z形节点,分别进行了转动刚度、破坏模式、承载能力、滞回性能、耗能能力和刚度退化等研究。结果表明:装配式Z形钢结构梁柱连接节点具有良好的延性且能够做到塑性铰外移。节点连接强度可显著影响其滞回性能和塑性抗弯能力;较低的强度设计系数(0.2~0.9)使节点破坏模式为螺栓率先发生破坏,其滑移失效承载力和极限承载力与强度设计系数基本呈线性正相关,且节点转动性能表现为半刚性;节点强度设计系数较高时(0.9~1.3),其滑移失效承载力和极限承载力基本保持不变,节点破坏模式转变为构件率先发生破坏,节点抗弯性能表现为刚性连接。此外,该节点构造形式下所需螺栓数量少,安装高效且经济性强,具有一定的工程应用价值。

The experiments under monotonic and cyclic loading conditions and simulation were conducted to investigate the mechanical properties of prefabricated Z-shaped steel beam-to-column connections.The rotational stiffness,failure mode,bearing capacity,hysteretic performance,energy dissipation,and stiffness degradation of Z-shaped connections with different designed strengths were studied respectively.The results showed that the prefabricated Z-shaped steel beam-to-column connections showed good ductility and could achieve plastic hinge movement outside the panel zone.The designed strength showed a significant effect on the hysteretic performance and plastic bending resistance of Z-shaped connections.The small value of designed strength parameter(0.2-0.9)made that the failure mode of Z-shaped connections was premature damage of bolts.The anti-slip and ultimate bearing capacity of Z-shaped connections increased linearly with the increase of designed strength,and the rotational performance of Z-shaped connections was semi-rigid.In case of the large value of designed strength parameter(0.9-1.3),anti-slip and ultimate bearing capacity of Z-shaped connections were almost unchanged.The failure mode was changed to premature damage of connected members,and the rotational performance of Z-shaped connections was rigid.In addition,the number of bolts required by the proposed Z-shaped connections was relatively small,and the installation was efficient and economical,