Three-Dimensional Numerical Simulation On Mesolevel And CT Experiment Verification Of Failure Process In Concrete

In the paper, concrete is taken as three-phase composites consisting of aggregate, mortar and bond between aggregate and mortar based on meso-mechanics. The failure process of concrete is simulated by means of the software — ANSYS developed secondly.The number of all kinds of aggregate is calculated according to the size of specimen, the grading of aggregate and the concrete mixture ratio. The random position of aggregate in specimen is generated by Monte-Carlo method. And 3-D math model is established for simulating the mesoscopic structure of concrete. The math model is achieved in the computer by ANSYS, and 3-D random aggregate model of concrete is established. The finite element model of concrete is meshed in the whole specimen. The material number of aggregate, mortar and bond element is identified automatically, and the mechanical parameters of every material are studied by the experiment and evaluated.By the above method, 3-D numerical model of the cylinder specimen of concrete is established, the mechanical performance and failure process of concrete subjected to uniaxial compressive stress is studied, the failure process caused by the initiation,propagation and coalescence of cracks is simulated, and the results of numerical simulation and CT experiment is compared and analyzed.A deep study on establishing 3-D numerical model of concrete on the mesolevel is carried out in this paper. Through the numerical simulation on the failure process of cylinder specimen of concrete, the failure mechanism of concrete under the action of outer load is further recognized .Therefore a new way is presented for the investigation of concrete strength.