Experimental Research And Finite Element Analysis On Shear Behavior Of High Strength Concrete Beams With High Strength Reinforced

Because of the various influential variables and complexity of failure mechanism of reinforced concrete beam, it has not yet formed a complete theoretical system for shear failure. Therefore, formula with certain reliability serving as design principle have been proposed in terms of statistical regression analysis based on experimental data by most countries, and China Code is of no exception. The formula proposed by Design Code of Concrete Structure (GB50010-2002) is based on experimental results of beams with normal strength concrete and reinforced, as for beams with high strength concrete and stirrups, a further study need to be done to determine whether the shear strength could be calculated according to current formula in the code and whether the safety criteria could be satisfied.In the present study, a shear bearing test was carried out on5simple supported beams made by high strength steel and high strength concrete which is under the concentrated load by the test. The form of crack, the model of failure, the deflection, the loading stress performance of steel and concrete were studied. The effects of different stirrup ratio and the amount of longitudinal reinforcement on the shear capacity of the beams were also discussed. The shear strength of test beams were compared with the shear design approaches of China Code for design of concrete structures, America ACI Code and the Eurocode2. The results indicate that with an increase of stirrup ratio, the shear strength of beams increased correspondingly, and the amount of longitudinal reinforcement also has a great impact on shear strength. In comparison with the shear capacity observed in the experiment, the results of calculation by codes are divergence. Compared with China Code, ACI Code and the Eurocode2have a high safety.The high strength steel and high strength concrete beams of the test were also analyzed by ANSYS, and the results of nonlinear element analysis were compared with the test results. The difference between experimental data and numerical simulation results is small.