Numerical Simulation On Mechanical Properties Of Foam-filled Concrete With Mesoscopic Model

With the development of the modern civil engineering, the traditional concrete with largeapparent density cannot fit the requirement of the some special civil industry. With thisbackground, one of the emphases of modern building materials was focused on the study ofthe high-performance lightweight concrete. In recent years, the lightweight foam concretematerial was also widely used in civil engineering in China. Especially, the foam-filledconcrete used in aircraft arresting system as a kind of energy absorbing material, has attractedthe attention of researchers. Researchers are trying to be study the foam-filled concrete withvarious methods.With the progress of the study, the various meso-structure models of the foam filledconcrete were established to study the properties with numerical simulations. In the presentthesis, the mechanical properties of the polystyrene granules (EPS)filled concrete were studywith numerical simulation basing on the meso-structure model.Firstly, the meso-structure models of foam filled concrete(FFC)are established. Basingon different assumptions, two kinds of meso-structure models are established, which arecalled the random meso-structure model and the regular meso-structure model. The programwas decoded with Matlab to obtain the description of geometric parameters about the twomeso-structure models（the radius of the foam and the coordinate of the center of the circle）.And the APDL programs are developed to generate the meso-structure models automaticallyusing the geometric parameters as the input data. The two meso-structure models areestablished successfully in ANSYS. And the high volume content of in the foam-filledconcrete with meso-structure models are generated with the developed programs.Secondly, with the explicit dynamic algorithm of ABAQUS, the effect of the distributionand the mechanical properties of EPS particle on the mechanical properties of the foam-filledconcrete are analyzed with the numerical method. The quasi-static compression numericalsimulation was carried out with meso-structure models to study the effects of the volumecontent and the particle size of EPS foam on the mechanical properties of the foam-filledconcrete.According to the numerical results, the distribution of EPS particles has little effect on its elastic modulus. But the compression strength, the plateau stress, and the energy absorbingability of the regular meso-structure model are larger than that of the the randommeso-structure model.The EPS particles has little effect on the elastic modulus andcompression strength. But the plateau stress and the energy absorbing ability of the EPS filledmodel are much larger than that of the single-phase model without of the EPS partial.With the volume content increasing, the elastic modulus, the compression strength, theplateau stress, and the energy absorbing ability all decrease. With the EPS particles diameterincreasing, the elastic modulus and compressive strength decrease, while the plateau stressincreases, the energy absorbing ability changes a little.