Influence of different steel fiber contents on properties of concrete
We focused on the C60 high-performance shaft concrete of the Zhaoshipan coal mine.Different experimental groups were set up with varying dry-wet cycle frequencies and different amounts of imitated steel fiber-reinforced composite material(FZ-SYS).By investigating macroscopic crack and fracture morphology,a numerical calculation model was estab-lished.The evolution process of cracks and constitutive relationships were deduced,and the concept of damage degree was defined.The results indicate:Using the Clump command to simulate coarse aggregates based on the linear parallel bonding model of PFC2D can effectively reproduce the macroscopic patterns of concrete specimens,providing reliable reference value;In the numerical simulation of the microcrack evolution process,composite cracks dominated by tensile cracks and supple-mented by shear cracks developed in the form of deflection around coarse aggregates,ultimately presenting a typical"X"shaped failure pattern;During the transition from short-term corrosion to long-term corrosion,the compaction stage expands,and the nonlinear elastic stage decreases.When the steel fiber content is 1.0％,the peak strength decays slowly,and the fluctuation range of the maximum damage degree is small.
万方数据
维普
