方形混凝土柱在双层箍筋约束下的力学特性研究

Research on the mechanical characteristics of square stub columns with double stirrup

为提高钢筋混凝土柱的抗震性能和延性,对方形混凝土柱在双层箍筋约束下的力学特性进行了研究.通过对单层箍筋约束方形混凝土柱和双层箍筋约束方形混凝土柱进行轴心受压试验,并结合有限元软件ABAQUS的模拟试验,研究了双层箍筋约束钢筋混凝土的轴心受压力学性能,分析了内外层箍筋间距、内外层箍筋之间距离、核芯混凝土截面面积大小等因素对混凝土约束效果的影响,并分析了配箍特征值λv对方形混凝土柱延性的影响.试验结果表明,双层箍筋能有效地约束钢筋混凝土的横向变形,对提高钢筋混凝土方形柱的极限承载力和延性有明显效果.

In this paper, the type of square stub column with double stirrups is put forward to improve the ductility and seismic performance of reinforced concrete. Square concrete columns with single stirrups and double stirrups are tested by axial compression. At the same time, finite element ABAQUS is used to simulate in the test. The impact of stirrup spacing, the distance between the inner and outer layers of stirrups, and the size of the core concrete section of the concrete on binding effect are analyzed. This paper also analyzes the impact of stirrup characteristic value on the ductility. Test results show that： double stirrups can effectively restrain the lateral deformation of reinforced concrete, and it is an obvious effect on the ultimate strength and ductility of reinforced concrete.