| Mechanism Matte co mpared to River sand has more angular,larger surface area,stone powder content and high mud,which restricts the mechanical properties of mountain sand concrete.Based on the test,the method of using the high-strength concrete in the mechanism sand is 3%,5%,7%,10%,15%,and the method of using concrete numerical simulation is used to study the five stone powder dosage.The basic mechanical properties of concrete,and co mpared with the test results,and simultaneously explore the damage of concrete from a desi red angle,revealing the mechanism of concrete failure,ultimately establishing the precision of concrete and macroscopic performance.Based on the test research of the effect of the fiber content,the fiber long diameter ratio and fiber type on the effect of high-strength concrete in the mechanism of the mesentery is 10% and 15%,the corresponding fiber concrete numerical model is established.Numerical simulation method,study fiber content,fiber long diameter ratio and fiber type on the mechanism of sto ne powder content of 10% and 15%,co mpared to test results,while disclosing fiber concrete from a fine angle Damage failure mechanism.First,the mortar test of the same mix ratio was performed according to the complex ratio obtained by the completed con crete test,and the substantial mechanism of the stone powder in the mechanism sand was 3%,5%,7%,10%,and15% of cement mortar.parameter.Second,according to the basic mechanical parameters of cement mortar of different stone powder,use Digimat-MF to establish concrete fine-viewing mechanics models of different stone powder content,and introduce concrete material parameters calculated in Digimat-MF into Abaqus software in ABAQUS.The finite element numerical trial model of the in-test conditions is e stablished and the finite element calculation of basic mechanical properties,thereby achieving a fine and macroscopic multi-scale coupling analysis simulation,comparing calculation results with test results,error between the two Smaller,within the acce ptable range,the numerical simulation form of concrete test is the same as the test.The statute-strain curve numerical simulation results are combined with the cross-sea model and Li Hui model,and the rising section is basically consistent,and the decl ine segment is steeper,showing more obvious brittleness.Third,according to the basic mechanical parameters of cement mortar in different stone powder,Digimat-Fe is used to establish a finite element model of Concrete 2-D random aggregate,introduced t he model into Abaqus,define the parameters of each phase material,and perform basic mechanical properties.Finite element calculation and co mpared analysis with test results,small errors,numerical simulation stress-strain curve rising sections and pass age sea models and Li Hui models are basically consistent,the decreased section is steeper;through the change of parameters,study the shape of aggregate,Aggregate random distribution,aggregate volume fraction,interface mechanical properties,and matrix pores on the basic mechanical properties of concrete to obtain concrete macro mechanical behavior and well-structured contact.3-D modeling and deployment of concrete,discovered that the 3-D model is more than 2-D model,and the 2-D model can reflect the mechanical properties and failure mechanism of concrete.Finally,add steel fiber and basalt fibers in concrete content of 10% and 15%,through numerical simulation,study fiber dosage,fiber type and fiber long diameter comparison of basic mechanical properties of concrete,while co mparing with test results Analysis,the two errors were small,and the form of numerical simulation of concrete test was the same as the test.Established solid fibrous concrete fabrication,co mpared analysis of the numerical simulation of truss fiber concrete,verify the feasibility of truss fiber model,and found that the truss fiber model can replace the numerical simulation of fiber concrete in the solid fiber model. |
PDF Full Text Request