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完成了4个预应力钢带加固钢筋混凝土柱试件和1个对比试件的轴压试验,表明横向预应力钢带可显著提高钢筋混凝土柱的延性和承载力。结合试验研究结果,进一步研究了横向箍筋、横向预应力钢带对混凝土的约束机理及影响因素,考察了预应力钢带对钢筋混凝土柱轴压承载力的影响和提高程度。通过分析钢带对混凝土的的有效约束区面积、非有效约束区面积以及钢带体积加固率等因素对钢筋混凝土柱轴压承载力的影响机理,提出了预应力钢带加固钢筋混凝土柱轴压承载能力计算方法和计算公式,计算结果与试验结果吻合较好。
The axial compression tests of four prestressed steel reinforced concrete columns and one comparative specimen are completed, which show that the transverse prestressing steel strip can significantly improve the ductility and bearing capacity of the reinforced concrete columns. Based on the experimental results, the restraining mechanism and influence factors of horizontal stirrup and transverse prestressing steel on concrete are further studied. The influence of prestressed steel strip on the axial compressive bearing capacity of reinforced concrete columns and the degree of improvement are also investigated. Based on the analysis of the influence mechanism of effective confinement area of steel strip on concrete, the area of ineffective confinement area and the volumetric reinforcement rate of steel strip on the axial compressive bearing capacity of reinforced concrete columns, the axial compression of prestressed steel strip Bearing capacity calculation method and calculation formula, the calculated results are in good agreement with the test results.