ORIGINAL RESEARCH OF THREE DIMENSION NUMERICAL VALUE ANALYSIS METHOD ON CONCRETE MECHANICS PERFORMANCE

摘要

Under the three dimensional coordinate system, through transformed X, Y, Z coordinate to obtain three kind of spheriform aggregates, according to the aggregate grading theoretical to calculate the aggregate pellet number in the three dimensional numerical concretes specimen, used the Monte Carlo methods to create stochastic position of the aggregate pellet in specimen, established the three dimensional sphere stochastic aggregate model of concretes; Defines the aggregate and the mortar matrix material parameter separately to the three dimensional concretes specimen with this construction relations, carrying on the finite element grid separately, carrying on the loading test to the numerical concretes specimen based on this, obtained the concretes uniaxial stretch and the uniaxial compression stress-strain relations, and drew the peak stress nephogram and the stress-strain curve of step by step loaded condition separately. The research indicated that in the existing production method of stochastic aggregate and material parametric model, existing many problems, such as the aggregate position fast search mathematics algorithm, the numerical contact surface model of each material region and how to achieve it by the computer, the description method of material damage dehiscence crack, the highly effective fast algorithm of the material numerical simulation, the break criterion which can respond the concretes actual spoilage process and so on many actual problem which remains unresolved, these questions will be the hot spot later.