The Theory Of Diagonal Crack Width Calculation On Reinforced Concrete Beam

Shear mechanism of reinforced concrete structures is a very complex issue, research history has been100years so far, reinforced concrete structure at home and abroad shear failure analysis methods proposed are:truss theory, the limit equilibrium theory, statistical analysis (thumb), fracture mechanics and nonlinear finite element method, but with respect to the study of shear capacity model, and the other focused on the destruction of the oblique section inclined cracks----Research and rare, Therefore, this paper will be inclined cracks calculation methods have been studied, according to two concentrated loads of14rectangular concrete section Charpy test, analyzed and discussed HPB300steel, HRB400rebar reinforced concrete beams do stirrups under concentrated loads performance concrete beams----oblique section failure modes and deformation properties of the beam deflection, and focuses on the factors of reinforced concrete beams diagonal cracking load tests, oblique crack width.On the basis of experimental studies, this paper consider softening the concrete conditions were changed using the modified compression field theory angle truss-type shear capacity holistic analysis and hazard analysis section of the tiny unit, combining traditional comprehensive crack theory, based on two diagonal crack widths theoretical calculation methods. Use diagonal crack width test data, calculated separately for the two theories was amended to give each diagonal crack width calculation formula will calculate the mean and the maximum value of the measured data with the experimental results of the diagonal crack widths are compared, the results two theoretical formulas indicate a certain extent, the changes are more in line with actual diagonal crack widths can be used to quantitatively calculate the diagonal crack width, but the biggest variable angle oblique coordinate discrete crack width slightly greater than the theoretical calculation of the truss, and pressure correction field test results meet the theoretical derivation of the formula calculation results can be better, and in the analysis can be calculated more perfect, with respect to the calculation of the two theories, can be used in the calculation of pressure field correction formula to calculate the width of the diagonal crack.