| To further improve the shear of concrete structure design theory,this paper proposes a decomposition method of concrete beam bending deformation and shear deformation experiment,moreover also has proposed decomposition method are discussed,through the development of concrete beam shear experiment and the experimental data respectively in the decomposition method to verify its correctness,through comparative analysis beam shear deformation estimation model is given to demonstrate the reference suggestion,the main contents are as follows:(1)This paper introduces the derivation process and calculation principle of the three experimental methods(Hiraishi Model,Debernardi Model and Qing SQ Model)for the bending deformation and shear deformation of decomposed concrete beams,and gives the formulas of bending deformation and shear deformation corresponding to each method.The author also analyzes and discusses the problems existing in each method in principle.(2)Under the assumption that the bending deformation of a straight beam with equal section can be represented by the longitudinal deformation of the tensile side at the top and the compression side at the bottom,the calculation method of bending deformation is derived by geometric method.After considering the influence of the longitudinal deformation on the diagonal deformation of the upper and lower sides of the beam,the calculation method of shear deformation is derived by using the measured deformation values of the two diagonal lines within the beam segment.After considering the influence of the measured deflection Angle on the deflection of the load point section,the calculated deflection value of the load point is obtained,which is composed of bending deformation,shear deformation and the influence of the rigid body rotation of the section.(3)For comparison and analysis the accuracy of the above four kinds of decomposition method,the author has carried out six inferior section straight beam single point of the static load experiment,the shear failure under different loading point location,the diameter of the shear span ratio and stirrup case,through the rectangle lattice dial indicator measuring device and digital image correlation(DIC)technology two separate measurement system for measuring regional objective specimen based data.The author substituted the experimental data into the above decomposition method to calculate the calculated deflection of the load point cross section under all levels of load level,and compared it with the measured load-deflection curve of the load point cross section.Finally,based on the comparison results of the decomposition methods,the author proposes an experimental verification method for the shear deformation estimation model of straight beams with equal section with a shear span ratio of less than 2. |
