| In this paper,the spatial steel fiber random distribution algorithm program was developed and combined with commercial finite element method to conduct numerical simulation on mechanical properties and influencing factors of randomly distributed steel fiber reinforced cement-based materials.The research contents and results are as follows:(1)The algorithm program of generating spatial random distribution steel fiber model was developed with MATLAB software,the generation,automatic correction and combination with commercial finite element software of random distribution steel fiber model were realized.The separate calculation of fiber and cement-based materials used in samples was realized;The auxiliary subroutine of steel fiber model was also developed to deal with the defects such as fiber overlap and inability to mesh.(2)Combined with the developed steel fiber model generation software,the separate calculation method of steel fiber and cement-based material in steel fiber cement-based specimen was proposed.The mechanical properties of steel fiber caused by the randomness of its distribution were studied by using the method of separate calculation.The effects of fiber length-diameter ratio and fiber distribution on mechanical properties of the specimens were studied.The effect of steel fiber on fracture toughness of cement-based specimen was studied.The statistical analysis of stress in all steel fibers were carried out and the effective area of steel fiber distribution was obtained.(3)The ultimate load and load displacement curves of the specimen with a fiber content of 0.6% were analyzed through the three-point bend experiment.The influence of steel fiber placement and length-diameter ratio on mechanical properties of samples was analyzed.Through qualitative and quantitative comparison,the results of numerical simulation and experimental method are basically consistent,which verifies the correctness of numerical simulation. |
PDF Full Text Request