Fracture damage process analysis of steel fiber reinforced concrete
In order to explore the role of steel fiber incorporation in concrete fracture,the wedge-split specimens were loaded by electric strain gauge method and digital image correla-tion(DIC)method,and the crack propagation behaviors of plain concrete and steel fiber rein-forced concrete were analyzed.The variation of the virtual crack opening displacement in the fracture zone with load and the variation of the virtual crack opening displacement distribu-tion under different loads were obtained by using the electric strain gauge method,and the curve was drawn.The strain field variation nephogram of the specimen was obtained by DIC method,and the opening displacement was calculated,which was compared with the electri-cal measurement data of the strain gauge.The results show that the steel fiber can prevent the crack development,and the bearing capacity of the steel fiber specimen changes more gently during the failure process.The application of DIC method is reliable before the speci-men reaches the peak load.In addition,the maximum bearing capacity of the specimens is calculated based on the double K fracture criterion,which is basically consistent with the ex-perimental results.Based on the crack cohesion model of nonlinear fracture and the calculation method of damage factor,and combined with the experimental data,the distribution law of the crack opening displacement and the damage variables in the fracture process region is given.
steel fiber reinforced concretefracture propertiesstrain gaugeDIC methodfracture process zonedamage factor
NETL
NSTL
万方数据
维普
