RC伸臂梁钢纤维砂浆钢筋网抗剪加固带性能研究

Shear behavior of RC overhanging beams strengthened by steel fiber mortar with reinforcement

为研究RC伸臂梁钢纤维砂浆钢筋网抗剪加固带剪切破坏特征及加固带抗剪极限承载力,对2根对比RC伸臂梁和2根外包钢纤维砂浆钢筋网抗剪加固带的RC伸臂梁进行剪切破坏试验.分析对比梁和试验梁的剪切破坏形态、开裂荷载、极限荷载、裂缝、挠度、应变的变化规律.试验表明,此抗剪加固带能提高梁的抗裂性、刚度、延性、抗剪极限承载力,其中开裂荷载提高幅度分别为35.61%、37/61%,极限荷载提高幅度分别为39.56%、51.84%.依据试验结果,采用塑性分析法求出RC伸臂梁钢纤维砂浆钢筋网抗剪加固带极限承载力计算公式.计算承载力与试验承载力较吻合,为结构加固理论提供了一种分析方法.

For the study of shear failure characteristics and ultimate shear capacity of RC overhanging beams strengthened by steel fiber mortar with reinforcement, an experimental research was conducted on the shear failure test of 2 contrast RC overhanging beams and 2 RC overhanging beams strengthened by steel fiber mortar with reinforcement. Test results showed that the cracking load, ultimate load, mode of shear failure, variation of crack, deflection, strain of the contrast beams and the test beams can be increased in which the cracking load increase rate were 35.61% and 37/61% respectively, and the ultimate load was increased to 39.56%, 51.84%. According to the results this shear strengthening belt can increase the crack resistance, stiffness, ductility and ultimate shear capacity of the beams. Based on the test results, plastic analysis method is proposed for ultimate shear capacity of RC overhanging beams strengthened by steel fiber mortar with reinforcement. Calculation of ultimate shear capacity and the testing ultimate shear capacity is consistent in providing an analysis method for the structure reinforcement theory.