Experimental Study And Numerical Simulation Analysis On Shear Performance Of High Strength Concrete Beams Reinforced With High Strength Reinforcement

Because of the various influential variables and complexity of failure mechanism of reinforced concrete beams, it has not yet formed a unified theoretical system for shear failure. The special mechanical properties of high-strength material make this problem even more complex. The current formula with certain reliability serving as design principle have been proposed in terms of statistical regression analysis based on experimental data of reinforced ordinary-strength concrete beams. Therefore, it is necessary to vertify whether they are applied to reinforced with high-strengh concrete(HSC) beams, and the consideration of the appropriateness of various factors would have to be further verified. Through experimental research, statistical analysis and finite element simulation method to assess the effect of design parameters on the shear capacity. Therefore, it has great significance to carry out shear bearing test of high-strengh steel(HSS) and HSC beams.In this paper, a shear bearing test is carried out on 14 simple supported beams made of high-strengh steel(HSS) and HSC, which are under the concentrated load to study their shear behavior. Then 408 HSC beams without transverse reinforcement and 196 HSC beams with transverse reinforcement are collected for statistical analysis. The test beams have also been analyzed by ANSYS. The result of finite element analysis also study the relationship between shear retension and shear-span ratio and stirrup ratio.The results indicate that, the failure mode is similar to ordinary-shrength concrete beams, but the diagonal cracks across the coarse aggregate with smooth surface. Shear-span ratio is the main parameter, which determines the failure mode, and the contribution of the concrete strength and stirrup ratio to shear capacity is subject to the constraint of shear-span ratio. With the increase of concrete strength, shear capacity increase firstly, then decrease, the amount of longitudinal reinforcement affects the shear capacity in the form of a power function. For HSC beams without transverse reinforcement, the safety margin of ACI 318-11 and NZS3010:2006 is higher than EN 1992-1-1:2004, but the calculated value by GB50010-2010 slightly exceed than the measured value. The formula 3.2 in this paper has the best predict result. For HSC beams with transverse reinforcement, the safety margin of EN1992-1-1:2004 is higher than ACI 318-11. The shear capacity formula found by statistical analysis is accurate than GB50010-2010. The load-displacement curves and failure modes of ANSYS are similar to test result, the deviation of shera capacity is within 15%. The shear capacity and failure mode are effected by shear retension. Shear retension is effected by shear-span ratio and stirrup characteristic. The smaller shear-span ratio, and higher stirrup characteristic, the greater shear retension. The research content can be used for the design of high strength concrete beams reinforced by high strength reforcement.