采用格构式组合钢节点连接的PC柱抗震性能试验研究

Experimental Study on Seismic Behavior of PC Columns with Latticed Steel Joint

为提高PC结构的装配效率及抗震性能,本文针对PC框架柱提出了一种新型连接构造方式,通过对2个装配柱试件和1个现浇柱试件进行低周往复加载试验,研究轴压比对装配柱承载能力、滞回性能、刚度、变形性能等的影响,对比分析装配柱与现浇柱的抗震性能差异,并提出合理的构造措施.研究表明:两类试件的破坏模式基本一致;相同轴压比下,装配柱的承载能力、耗能能力、刚度退化及延性等与现浇柱差异较小,装配柱总体上与现浇柱具有相当的抗震性能,在实际工程中可按现浇柱进行设计;加载位移角过大时,试件核心区箍筋失效,装配柱拼接段混凝土易产生竖向裂缝,建议采取箍筋加密的方法予以改善和避免.

A new connection mode for prefabricated concrete columns with rational details was studied to improve the assembly efficiency and seismic behavior of PC structure,two prefabricated column specimens and one cast-in-place column specimen were tested under low cyclic reversed loading to investigate the influence of the axial compression ratio on the bearing capacity,hysteretic energy dissipation,stiffness and the deformation capacity of the specimens,and some reasonable improvement measures were then proposed by comparing the difference in seismic behavior between the prefabricated columns and the cast-in-place column.The results show that the failure mode is the same basically;There are no remarkable differences in load carrying capacity,energy dissipation capacity,stiffness degradation and the ductility of prefabricated columns under the same axial compression ratio compared to the cast-in-place column,the PC columns also possess similar seismic performance basically,so it can be designed according to the cast-in-place column in practical engineering.However,the stirrups in core areas are prone to failure under a large inter-story drift ratio,and there are some vertical cracks in the connection area of PC columns,additional stirrups are needed to prevent or postpone this phenomenon.