高强螺旋箍筋约束混凝土柱连接抗震性能试验研究与理论分析

Seismic behavior experimental study and theoretical analysis on high-strength spiral stirrups confined concrete column

对于采用高强螺旋箍筋约束混凝土柱的装配整体式框架结构,提出了一种新的柱-柱连接方式,即在局部外包钢管设置横穿栓筋进行连接。制作足尺装配整体式柱和整浇柱试件,对其进行低周反复加载拟静力试验。通过观测试件的受力、变形、破坏过程及破坏形态,分析其承载能力、变形能力和耗能能力,验证了新型连接的可靠性。结果表明:在高轴压比下,采用新型连接的高强螺旋箍筋约束混凝土装配整体式柱与相应整浇柱均具有良好抗震性能,可以替代整浇柱应用于高烈度地震设防区的建筑结构中。结合试验,对新型连接的受力机制进行理论分析,提出了连接屈服荷载和破坏荷载的计算式,并通过计算结果与试验结果的比较,验证了理论公式的正确性。

For high strength stirrup confined concrete columns of the frame structure, a new column-column connection is put forward where the local wrapping steel tube and bohing bars are used. The full-scale prefabricated columns and cast-in-place column specimen were produced and experiments of specimens under quasi-static cyclic reversed loading were carried out. The force, deformation, failure process and failure mode of specimens were observed and its load carrying capacity, deformation capacity and energy dissipation capacity were analyzed. The reliability of the new connection was verified. The result of experiments shows that high-strength spiral stirrups confined of concrete monolithic columns and cast-in-place columns have the same excellent seismic performance under high axial compression ratio. The assembled monolithic compound spiral reinforced concrete columns can be adopted in high seismic zones instead of cast-in-place columns. According to the test, the mechanical behavior of a new type of connection was analyzed, and the calculation formula of yield load and maximum load are put forward. By comparing the calculation results and test results, the correctness of the theoretical formulas was verified.