Experiment Study And Finite Element Analysis On Flexural Toughness Of Steel Fiber Reinforced Concrete

Toughness as an important index of mechanical performance of Steel fiber Reinforced concrete?SFRC?is defined as the energy dissipation capability of material or structure from load to failure.The flexural toughness is widely used as an index of SFRC toughness.In this paper,the bending test and finite element analysis were carried to study the flexural toughness of concrete with new steel fibers.The main contents of this thesis are as follows:1.The three point bending test was carried out on the notched beam specimens of 150*150*550 mm and the load deflection curves obtained from the test were discussed.The flexural toughness index was calculated by the evaluation recommend by RILEM TC 162-TDF.The orthogonal design was adopted to analyse the influences of steel fiber volume ratio and type,matrix concrete strength and notch depth on the flexural toughness of SFRC.2.The calculated bending strength f_eq,2 and f_eq,3,the residual tensile strength F_RR,1,F_R,2,F_R,3 and F_R,4 were analyzed by contrast.The results show that the equivalent bending strength and residual strength have a high linear correlation.Meanwhile,the results were analyzed by multivariate fitting between the equivalent bending strength f_eq,2 and f_eq,3 and the splitting tensile strength,compressive strength of steel fiber concrete,the notch depth,and the steel fiber volume ratio of SFRC,the corresponding calculation models were developed to obtain the characteristic parameters of steel fiber.3.The finite element software ABAQUS was used for the numerical simulation of steel fiber notched beams.The load deflection curves of notched beams were obtained to verify the rationality of the model by comparing with the experimental curves.