【摘要】 预应力钢带加固技术为一种新型加固技术,用于钢筋混凝土梁抗剪加固时能有效约束混凝土,改善梁抗剪破坏形态,提高钢筋混凝土梁斜截面抗剪承载能力。预应力钢带加固通过1根普通钢筋混凝土梁和4根预应力钢带加固的钢筋混凝土的对比试验,初步研究了预应力钢带的加固间距﹑加固层数及倒角处理对钢筋混凝土梁抗剪性能的影响。试验结果表明,利用预应力钢带进行加固,可以显著提高钢筋混凝土梁的抗剪承载力,改善钢筋混凝土梁的变形性能,且加固间距越小,梁的抗剪承载力提高程度越明显。更多还原

【Abstract】 Prestressed steel strips retrofit method was a new retrofitted method,which could be used to retrofit reinforced concrete,especially when the reinforced concrete was deficient in shear performance. In such case,the prestressed steel strips could efficiently confine the concrete,and then improve the shear performance as well as shear bearing capacity of the beam. Based on comparing the tests of one ordinary reinforced concrete beam and four reinforced concrete beams retrofitted by transversely prestressed steel strips,the influences on the shear bearing capacity of the retrofitted reinforced concrete beams of numbers of strips layers and spacing of strips were initially studied. The test results showed that the transversely prestressed steel strips could obviously increase the shear bearing capacity and improve the ductility of retrofitted beams. And with the spacing of transversely prestressed steel strips becoming smaller,the shear bearing capacity of the strengthened beams increased.更多还原