Experimental Study On Shearing Behavior Of Steel Fiber Reinforced Concrete T-beam

Steel fiber concrete is a new type of composite material that is widely used today.Replacing a part of the coarse aggregate of concrete with a certain volume of steel fiber can effectively improve the tensile and deformation properties of the concrete,and can effectively slow the crack development and extension.In this paper,the research on the good performance of steel fiber reinforced concrete affects the shear performance of T-section beam,and provides a reference for practical engineering applications.In this paper,five sets of different steel fiber volume ratio concrete test T-beams are compared with a set of ordinary concrete test T-beams.By observing the loading process,cracking and extension of oblique cracks,concrete strain in shear zone,stirrup strain,mid-span deflection and final failure morphology,the steel fiber volume fraction is studied on steel fiber reinforced concrete T-beam.The effect of oblique section cracking load,ultimate load and maximum width of oblique crack.According to the experimental phenomenon,the influence of the steel fiber volume fraction on the rectangular beam is also applicable to the T-section beam.The concrete performance:it can also slow the development and extension of the oblique crack,increase the concrete compressive strain in the shear zone and enhance the self-resistance of the test beam.Deformability.The calculation method of cracking load at home and abroad is collected,the calculation method is analyzed,the calculation result and the measured data are compared,and the well-consistent calculation formula is used as the calculation method of the oblique load of the steel fiber reinforced concrete T-shaped beam.Based on the measured data,the regression coefficient of the concrete bearing capacity with respect to the shear span ratio and the longitudinal reinforcement ratio,the T-section flange flange action coefficient and the stirrup reinforcement capacity with respect to the shear span ratio are proposed.The calculation formula of the bearing capacity of the oblique section of steel fiber reinforced concrete T-shaped beam is obtained.Based on the calculation model of the oblique crack width,the horizontal projection length of the oblique crack,the cracking load difference coefficient.the stirrup strain unevenness coefficient and the average crack increase coefficient regression equation are derived based on the actual data,and then the steel fiber reinforced concrete T-section beam is established.The calculation method of the maximum width of the oblique crack.