Numerical Simulation Method For Polygonal Aggregate Distributions And Theoretical Research Of Dynamic Modulus Of Elasticity In Concrete

The job of this paper was divided into two parts mainly. Firstly, the numerical simulation approach for polygonal aggregate was presented. Secondly, the space analysis model for dynamic modulus of elasticity of concrete was set up, and a series of theories analysis and calculations to the model were performed.The concrete was taken as a two-phase composite material consisting of mortar matrix and aggregate on mesoscopic level in the numerical simulation approach for polygonal aggregate. Firstly, aggregate particles of various sizes were generated for a given aggregate gradation curve and aggregate area fraction. The generated aggregate particles were then distributed in a concrete intersection by using Monte Carlo's technique. Simulated results demonstrated that the generated aggregate patterns were very similar to practical aggregate distributions. Simulated results provided the precondition and foundation for mesoscopic mechanical analysis in concrete. If combining simulated results and the finite element method, dynamic mechanical behavior in concrete can be further analyzed.The job of set up and analyse the space analysis model was based on the test data obtained by Prof. Xianyu Jin of Zhejiang University through the test method of Subramaniam. Firstly, set up the space analysis model, carry on mode and harmonious analysis to the model with ansys, try to get the amplitudes of each point, and then calculated the dynamic modulus of elasticity. Comparing the dynamic modulus of elasticity of the model in each age with the corresponding values of the test data, we can verified the feasibility of the method . With changing the value of every parameter of the model, we can analyse the impact on the dynamic modulus of elasticity " of every parameter. The results showed that the model fit in with the test data well, having certain practical values.