柱端不同箍筋配置形式下钢筋混凝土柱抗震性能试验研究

为研究柱端不同箍筋配置形式对钢筋混凝土柱抗震性能的影响,采用柱剪力、柱端主筋变形及柱端箍筋变形作为评价指标,对3根截面尺寸与主筋配置相同、端部箍筋配置形式不同的钢筋混凝土柱进行反复荷载作用下的地震模拟试验。结果表明,对柱端端部箍筋加密,可以提高钢筋混凝土柱的抗剪性能;而对柱端腹部箍筋加密对钢筋混凝土柱的抗剪性能没有影响。钢筋混凝土柱端端部或柱端腹部箍筋加密后,对柱端主筋变形及柱端箍筋变形的影响主要与转角相关,转角较小时影响很小,反之影响较大。该试验可为对抗震性能有要求的钢筋混凝土柱箍筋配置形式的合理确定提供科学参考。

Experimental Research on Seismic Performance of Reinforced Concrete Column with Different Stirrup Configuration Forms at Column Ends

Aiming to study on the seismic performance of reinforced concrete column with different stirrup configuration forms at column ends, column shear, main reinforcement deformation of column ends and stirrup deformation of column ends are used as evaluation index. Three reinforced concrete columns with the same section size, main reinforcement configuration and different stirrup configuration at ends are tested under cycle reversed loads. The results show that: the shearing properties of reinforced concrete column can be improved if the stirrups are concentrated at the end of column ends. However, the shearing properties can not be improved if the stirrups are concentrated at the stomach of column ends. After the end and the stomach of column ends concentrated, the influence on deformation of main reinforcement and stirrup at column ends has a connection with rotation. If the rotation is small, the influence is small. On the contrary, the influence is big. This test could provide a scientific reference for reasonably determining stirrup configuration forms for reinforced concrete column with requirements on seismic performance.