不同参数对活性粉末混凝土梁剪切延性影响试验研究

RESEARCH ABOUT EFFECT OF DIFFERENT PARAMETERS ON SHEAR DUCTILITY OF REACTIVE POWDER CONCRETE BEAMS

通过10根活性粉末混凝土(RPC)梁在两点加载作用下的抗剪性能试验,研究剪跨比、配箍率及钢纤维掺量等因素对活性粉末混凝土梁抗剪破坏形态、剪切延性的影响。通过荷载–挠度曲线和剪切延性系数N1与N2对比分析不同参数下RPC梁的剪切延性,结果表明剪切延性随剪跨比、配箍率、钢纤维掺量的增大而增大;当剪跨比、配箍率达到一定值时,剪切延性提高效果明显减缓;而当钢纤维掺量增加到一定值时,剪切延性不再增加,反而开始降低;根据试验结果,给出RPC梁剪切延性较高时最佳钢纤维掺量。

Under two symmetrically concentrated loads, the shear performance of 10 reactive powder concrete （RPC） beams were tested. That shear span ratio, stirrup ratio and steel fiber content and other factors affected the shear failure pattern and shear ductility of RPC beams was researched. The shear ductility of RPC beams with different parameters were analyzed by means of the load deflection curve and shear ductility factor and the consequence revealed that the shear ductility increased with the increase of shear span ratio, stirrup ratio and steel fiber content; While the shear span ratio and the stirrup ratio reached a certain value, the improvements of shear ductility obviously reduced. However, the shear ductility didn＇t increases, but began to reduce, while the steel fiber content increased to a certain value. According to the test results, the best steel fiber content was provided under high shear ductility of RPC beams.