Dynamic Compressive Numerical Simulation Research Of Randomly Aggregate Model Of Concrete

Concrete is a composite material composed of a matrix composed of an aggregate,the destruction process than ideal brittle material more complicated. Due to the dynamicload case, the micro-crack propagation under static load path more tortuous than difficultto capture, fracture injuries and other conditions of ordinary concrete meso-structure ismore complex and more common. The current research entities dynamic mechanicalmeans in terms of the realization of meso difficult, numerical methods is high efficientresearch techniques.Mechanical behavior of concrete but also with the size, aggregate performance andother factors related to the specimen, the paper by means of numerical studies on therelationship between the size effect phenomenon and various mechanical test parameterswere analyzed with the help explain the composition of concrete the intrinsic relationshipbetween structure and properties, to promote engineering practice the theory of macromechanical behavior of concrete reference value.The second chapter, the combination of relevant theoretical summary meso randomaggregate basic principles. Microstructure of concrete or dynamic loading static loadingare analyzed from the crack tip region extended criteria microcracks more commonconcrete composite material I-II fracture. The random aggregate theory and computernumerical method combining finite element theory for concrete structures microscopicdamage model for more detailed analysis of each of the components of the strain ratetheory under dynamic loading conditions and material models will be discussed.Consider the non-uniformity of the concrete, the analysis focuses on the impact ofaggregate gradation on concrete performance and expounded the Monte Carlo method. Inthe third chapter and its computer implementation, while the dynamic mechanicalproperties of ABAQUS correction parameters and assigned to the appropriate unit, callthe Matlab program generates the corresponding random aggregate model, this processpresents an improved occupied area excluding specimen method to generate run.Combined with existing norms, the model set test parameters and meshing.According to the numerical analysis of the concrete realization of the difficulty andconditions for full grade concrete specimens cuboid dynamic simulation model to find theaxial compression fracture regularity. The results will be different sizes, differentboundary conditions, the model under different strain rates for numerical simulation analysis and comparison of in-depth summary of damage and crack propagation lawdistribution.By performing four loading rate on concrete compressive strength of the comparativeanalysis is to explain the process of macroscopic damage concrete materials provide a newway and a reference angle on relationship building concrete between microstructure andmacroscopic properties achieved some results. Is often subject to dynamic loading,seismic effects of major projects, high-rise building has great value in providing researchdata.