钢纤维混凝土断裂过程测试与力学性能

为了研究钢纤维混凝土的断裂过程和承载力的估算方法，通过加载试验机分别对四种不同尺寸的钢纤维混凝土试件进行楔入式劈裂断裂实验，并对其中两个试件粘贴应变片进行跟踪电测。实验得到了一系列载荷–位移关系曲线，由数据计算获得各个试件的载荷与张开位移关系曲线，以及断裂损伤区变形随载荷变化曲线。结合黏聚裂纹应力强度因子与双 断裂准则，对各组试件的承载力进行估计，并将其计算值与实验结果的平均值作比较，两者较吻合；表明用断裂力学原理分析该类材料结构的初期失效，和估计中小尺寸构件的承载能力是可行的。

The fracture process measurement and mechanics performance analysis of steel fiber reinforced concrete

To research the facture process and bearing capacity calculation method of concrete, wedge-splitting experiment of 4 sizes of steel fiber reinforced concrete specimens were carried out, in which two specimens were measured with electrical strain gauges equipment. A series of experimental curves were obtained and analyzed, such as the curves of displacement of load point with loading, fracture damaged zone deformation with loading, and position of cohesive crack tip with loading. For different size of fracture specimens, the bearing capacity was obtained through the computation formula of stress intensity factor and the double-K fracture criterion, and the calculated values are agreement well with the tested results. It shows that the method of bearing capacity calculation is feasible.