Finite element analysis of shear transfer of fibrous concrete under compressive stress

الملخص EN

This study presents a numerical analysis of push-off and modified push-off fibrous concrete specimens.

The investigated variables were, volume fraction of fibers, area of reinforcement, and the ratio of the compressive to the shear stress.

Eight nodes isoperimetric elements were used to represent concrete, and embedded bar elements to represent the reinforcement.

The nonlinear behavior of fibrous concrete in compression, tension and the reduction of the shear modulus due to cracking were taken into account.

The numerical results showed good agreement with the experimental results, the average ratio of the calculated to the experimental first crack shear stress is (0.955), and the average ratio of the calculated to the experimental shear strength was (0.981).

The cracks patterns showed that the fibrous specimens have less numbers of cracks than that of plain specimens at a certain shear force, and the presence of fibers delay the initiation the cracks.

The calculated slip is slightly more than the experimental slip at early stage of loading and the difference increased prior to the failure load.