| As a new type of steel bar with high strength and ductility, HRBF500 steel bar has been widely used abroad but not taken into our country's Code for design of concrete structures(GB50010-2002) (Code for short) yet. To give guideline of the design practice in our country's engineering area, this paper carried out an experimental study of HRBF500 steel bar and also some numerical analysis of the beam specimens were also done.The shear behavior and diagonal crack width and the impact of the HRBF500 stirrups and shear span ratio at service stage are discussed and analyzed according to the tests of 3 concrete beams with 500MPa hot rolled bars of fine grains(HRBF500) under concentrated load. The test results indicate that concrete beams with HRBF500 as stirrup can markedly improved the shear bearing capacity than the beams with conventional stirrup, but influence of the diagonal crack width is not considerable. As the shear span ratio increases, the shear bearing capacity decreased and the diagonal crack width increased.The experimental research indicated that the performance of RC beams reinforced by HRBF500 steel bar was much the same as the common RC beams. The beams'shear bearing capacity can be calculated by the formulas proposed by the Code. Because of the high stress state of HRBF500 steel bar while the beams taking loads during the limit state of serviceability, it is recommended that the diagonal crack width of the beams should be checked by the Code's formulas. The appearing orders of different plastic hinges were distinguished with elastic analysis method in order to obtain the specimen's ability of moment modulation conveniently.This paper used FEM software ANSYS to create the FEM models of all the beams and simulate the whole experimental process. The numerical analysis results were also checked by the experiment.From the comparison of the numerical results and experimental ones,it can be seen that the numerical results show excellent agreement with the experimental ones. |
PDF Full Text Request