预应力钢带加固钢筋混凝土柱轴压承载力试验研究

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。

EXPERIMENTAL RESEARCH ON AXIAL COMPRESSION BEARING CAPACITY OF REINFORCED CONCRETE COLUMNS CONFINED BY PRESTRESSED STEEL STRIP

The axial compressive tests of four prestressed steel reinforced concrete column specimens and a reference specimen have been finished.that the transverse prestressing steel strip can significantly improve the ductility and bearing capacity of reinforced concrete columns.According to test results it was further studied the binding mechanism and influencing factors of the transverse stirrups and horizontal prestressed strip on concrete;it was also examined the effect of prestressed strip on the bearing capacity of reinforced concrete columns under axial compression and improving degree.Through the analysis of the effect machanism of steel strip on concrete constrained area,non-effective constraint area and strip volume reinforcement rate of reinforced concrete columns under axial compression,it was proposed the bearing capacity calculation methods and formulas of prestressed strip reinforced concrete columns under axial compression.The calculated results agree well with experimental results.