装配式异形柱节点抗震性能试验研究

为了研究新型装配式异形柱节点的抗震性能,更好地推广新节点应用于实际工程,设计制作并进行了2组异形柱节点的拟静力试验。通过观察4个试件的裂缝开展破坏过程,分析每个试件位移、刚度、强度和耗能等抗震指标。结果表明:装配边柱节点与现浇节点的破坏过程和类型基本一致,而两个中柱节点的破坏过程及类型有明显区别;纵筋采用直螺纹套筒和灌浆套筒连接均能够有效传递双向应力,实现钢筋与混凝土的有效传力;叠合板滑移影响装配节点承载力;装配节点的刚度比现浇节点稍低,但因较早屈服,破损位移相近,延性变形优于现浇节点,能够满足基于性能设计的框架结构层间位移角限值2%(生命安全(LS)性能)要求。

Experimental study on seismic behavior of assembled special-shaped column joints

In order to study the seismic behavior of the new type of assembled special-shaped column joints and promote the application of the new joints in practical engineering, two groups of special-shaped column joints were designed and quasi-static tests were conducted. By observing the fracture failure process of four specimens, the seismic indexes of displacement, stiffness, strength and energy consumption of each specimen were analyzed. The results show that the failure process and type of the assembled side column joints and the cast-in-place joints are basically the same, while the failure process and type of the two middle column joints are significantly different. The longitudinal bar is connected with straight thread sleeve and grouting sleeve, which can effectively transfer the bidirectional stress and realize the effective force transfer between reinforcement and concrete. Composite slab slip affects the bearing capacity of assembly joints. The stiffness of the assembly joint is slightly lower than that of the cast-in-place joint, but due to early yield, similar damage displacement, ductile deformation is better than that of the cast-in-place joint, which can meet the seismic behavior requirement of 2% of the ultimate story drift angle to ensure life safety.